[Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect

Bug #1886714 reported by John Erling Blad on 2020-07-07
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
bluez (Ubuntu)
Undecided
Unassigned
linux (Ubuntu)
Undecided
Unassigned

Bug Description

This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on.

I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.)

It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;)

To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset.

Now…

Given I restart the computer
And boot into Ubuntu 19.10
And log in as myself
And attach a pair of Sony MDR-ZX770BN
When I listen to sound from a movie with A2DP
Then at some random point it start to lag noticeably (sound becomes scratchy)
And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects)

It may take 5–10 minutes and up to several hours before it disconnects.

Given I turn the headphones off
And back on
When it reconnects to the computer
Then the computer fails to enable the sound device (visible in the preference manager f.ex.)

There are several reports of various equipments that disconnect, and I wonder if this could be the same problem.

Problem 1

The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue.

The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current.

Is there any way to get a more specific failure report from the dongle?

Problem 2

After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1.

A few dumps

john@hydra:~$ dmesg | fgrep 'Blue'
[ 3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0
[ 8.417252] Bluetooth: Core ver 2.22
[ 8.417280] Bluetooth: HCI device and connection manager initialized
[ 8.417284] Bluetooth: HCI socket layer initialized
[ 8.417286] Bluetooth: L2CAP socket layer initialized
[ 8.417301] Bluetooth: SCO socket layer initialized
[ 8.779706] Bluetooth: hci0: BCM: chip id 63
[ 8.780703] Bluetooth: hci0: BCM: features 0x07
[ 8.796682] Bluetooth: hci0: hydra
[ 8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467
[ 9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467
[ 9.687584] Bluetooth: hci0: Broadcom Bluetooth Device
[ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 10.571442] Bluetooth: BNEP filters: protocol multicast
[ 10.571448] Bluetooth: BNEP socket layer initialized
[ 630.835385] Bluetooth: RFCOMM TTY layer initialized
[ 630.835393] Bluetooth: RFCOMM socket layer initialized
[ 630.835398] Bluetooth: RFCOMM ver 1.11

john@hydra:~$ dmesg | fgrep 'sound'
[ 7.920552] input: HDA ATI SB Rear Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input27
[ 7.920612] input: HDA ATI SB Front Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input28
[ 7.920657] input: HDA ATI SB Line as /devices/pci0000:00/0000:00:14.2/sound/card0/input29
[ 7.920704] input: HDA ATI SB Line Out Front as /devices/pci0000:00/0000:00:14.2/sound/card0/input30
[ 7.920749] input: HDA ATI SB Line Out Surround as /devices/pci0000:00/0000:00:14.2/sound/card0/input31
[ 7.920795] input: HDA ATI SB Line Out CLFE as /devices/pci0000:00/0000:00:14.2/sound/card0/input32
[ 7.920837] input: HDA ATI SB Line Out Side as /devices/pci0000:00/0000:00:14.2/sound/card0/input33
[ 8.686155] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input34
[ 8.686215] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input35
[ 8.686264] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input36
[ 8.686317] input: HDA NVidia HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input37

john@hydra:~$ dmesg | fgrep 'USB'
[ 0.418396] ACPI: bus type USB registered
[ 1.038660] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.038894] ehci-pci 0000:00:12.2: new USB bus registered, assigned bus number 1
[ 1.038901] ehci-pci 0000:00:12.2: applying AMD SB600/SB700 USB freeze workaround
[ 1.053113] ehci-pci 0000:00:12.2: USB 2.0 started, EHCI 1.00
[ 1.053163] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.03
[ 1.053165] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.053260] hub 1-0:1.0: USB hub found
[ 1.053554] ehci-pci 0000:00:13.2: new USB bus registered, assigned bus number 2
[ 1.053565] ehci-pci 0000:00:13.2: applying AMD SB600/SB700 USB freeze workaround
[ 1.069110] ehci-pci 0000:00:13.2: USB 2.0 started, EHCI 1.00
[ 1.069167] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.03
[ 1.069168] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.069252] hub 2-0:1.0: USB hub found
[ 1.069413] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.069537] ohci-pci 0000:00:12.0: new USB bus registered, assigned bus number 3
[ 1.133139] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.03
[ 1.133140] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.133219] hub 3-0:1.0: USB hub found
[ 1.133430] ohci-pci 0000:00:12.1: new USB bus registered, assigned bus number 4
[ 1.197138] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.03
[ 1.197139] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.197215] hub 4-0:1.0: USB hub found
[ 1.197418] ohci-pci 0000:00:13.0: new USB bus registered, assigned bus number 5
[ 1.261145] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.03
[ 1.261146] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.261222] hub 5-0:1.0: USB hub found
[ 1.261431] ohci-pci 0000:00:13.1: new USB bus registered, assigned bus number 6
[ 1.325138] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.03
[ 1.325140] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.325221] hub 6-0:1.0: USB hub found
[ 1.325431] ohci-pci 0000:00:14.5: new USB bus registered, assigned bus number 7
[ 1.344296] usb 1-2: new high-speed USB device number 2 using ehci-pci
[ 1.345192] usb usb7: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.03
[ 1.345194] usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.345270] hub 7-0:1.0: USB hub found
[ 1.345369] uhci_hcd: USB Universal Host Controller Interface driver
[ 1.411039] usb 2-3: new high-speed USB device number 2 using ehci-pci
[ 1.514751] usb 1-2: New USB device found, idVendor=0bda, idProduct=5411, bcdDevice= 1.17
[ 1.514754] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1.514755] usb 1-2: Product: 4-Port USB 2.0 Hub
[ 1.515556] hub 1-2:1.0: USB hub found
[ 1.567748] usb 2-3: New USB device found, idVendor=058f, idProduct=6362, bcdDevice= 1.26
[ 1.567751] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1.973469] usb 3-3: new full-speed USB device number 2 using ohci-pci
[ 2.170518] usb 3-3: New USB device found, idVendor=0d8c, idProduct=0005, bcdDevice= 1.00
[ 2.170520] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.170521] usb 3-3: Product: Trust USB microphone
[ 2.183643] usbhid: USB HID core driver
[ 2.185772] hid-generic 0003:0D8C:0005.0001: hidraw0: USB HID v1.11 Device [MICE MICROPHONE Trust USB microphone] on usb-0000:00:12.0-3/input2
[ 2.505487] usb 1-2.1: new full-speed USB device number 4 using ehci-pci
[ 2.617127] usb 1-2.1: New USB device found, idVendor=046d, idProduct=c52b, bcdDevice=12.10
[ 2.617129] usb 1-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.617131] usb 1-2.1: Product: USB Receiver
[ 2.618805] usb-storage 2-3:1.0: USB Mass Storage device detected
[ 2.619057] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1:1.0/0003:046D:C52B.0003/input/input6
[ 2.677563] hid-generic 0003:046D:C52B.0003: input,hidraw2: USB HID v1.11 Keyboard [Logitech USB Receiver] on usb-0000:00:12.2-2.1/input0
[ 2.680158] input: Logitech USB Receiver Mouse as /devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1:1.1/0003:046D:C52B.0004/input/input7
[ 2.680246] input: Logitech USB Receiver Consumer Control as /devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1:1.1/0003:046D:C52B.0004/input/input8
[ 2.737594] input: Logitech USB Receiver System Control as /devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1:1.1/0003:046D:C52B.0004/input/input9
[ 2.737717] hid-generic 0003:046D:C52B.0004: input,hiddev1,hidraw3: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:12.2-2.1/input1
[ 2.739666] hid-generic 0003:046D:C52B.0005: hiddev2,hidraw4: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:12.2-2.1/input2
[ 2.741464] usb 1-4: new high-speed USB device number 5 using ehci-pci
[ 2.931723] usb 1-4: New USB device found, idVendor=045e, idProduct=0772, bcdDevice= 1.13
[ 2.931726] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.935880] hid-generic 0003:045E:0772.0006: hiddev3,hidraw5: USB HID v1.01 Device [Microsoft Microsoft® LifeCam Studio(TM)] on usb-0000:00:12.2-4/input4
[ 2.977461] usb 1-2.2: new full-speed USB device number 6 using ehci-pci
[ 3.089580] usb 1-2.2: New USB device found, idVendor=0b05, idProduct=17cb, bcdDevice= 1.12
[ 3.089582] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.169464] usb 1-2.4: new high-speed USB device number 7 using ehci-pci
[ 3.278933] usb 1-2.4: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[ 3.278934] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[ 3.278936] usb 1-2.4: Product: USB 10/100/1000 LAN
[ 3.446110] logitech-djreceiver 0003:046D:C52B.0005: hiddev1,hidraw2: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:12.2-2.1/input2
[ 3.568023] hid-generic 0003:046D:406B.0007: input,hidraw3: USB HID v1.11 Keyboard [Logitech Unifying Device. Wireless PID:406b] on usb-0000:00:12.2-2.1/input2:1
[ 3.570052] hid-generic 0003:046D:408A.0008: input,hidraw4: USB HID v1.11 Keyboard [Logitech Unifying Device. Wireless PID:408a] on usb-0000:00:12.2-2.1/input2:3
[ 3.642325] scsi 6:0:0:0: Direct-Access Generic USB SD Reader 1.00 PQ: 0 ANSI: 0
[ 3.642811] scsi 6:0:0:1: Direct-Access Generic USB CF Reader 1.01 PQ: 0 ANSI: 0
[ 3.643306] scsi 6:0:0:2: Direct-Access Generic USB SM Reader 1.02 PQ: 0 ANSI: 0
[ 3.643807] scsi 6:0:0:3: Direct-Access Generic USB MS Reader 1.03 PQ: 0 ANSI: 0
[ 3.711373] logitech-hidpp-device 0003:046D:406B.0007: input,hidraw3: USB HID v1.11 Keyboard [Logitech M585/M590] on usb-0000:00:12.2-2.1/input2:1
[ 3.869329] logitech-hidpp-device 0003:046D:408A.0008: input,hidraw4: USB HID v1.11 Keyboard [Logitech MX Keys] on usb-0000:00:12.2-2.1/input2:3
[ 8.349483] usb 1-2.4: reset high-speed USB device number 7 using ehci-pci
[ 8.812297] USB Video Class driver (1.1.1)

Note that USB 6.1 is edited out of the list.

john@hydra:~$ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10

john@hydra:~$ apt-cache policy bluez
bluez:
  Installert: 5.50-0ubuntu5.1
  Kandidat: 5.50-0ubuntu5.1
  Versjonstabell:
 *** 5.50-0ubuntu5.1 500
        500 http://archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu eoan-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.50-0ubuntu4 500
        500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages

john@hydra:~$ apt-cache policy pulseaudio
pulseaudio:
  Installert: 1:13.0-1ubuntu1.2
  Kandidat: 1:13.0-1ubuntu1.2
  Versjonstabell:
 *** 1:13.0-1ubuntu1.2 500
        500 http://archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu eoan-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1:13.0-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages

john@hydra:~$ apt-cache policy pulseaudio-module-bluetooth
pulseaudio-module-bluetooth:
  Installert: 1:13.0-1ubuntu1.2
  Kandidat: 1:13.0-1ubuntu1.2
  Versjonstabell:
 *** 1:13.0-1ubuntu1.2 500
        500 http://archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu eoan-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1:13.0-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages

After connecting the headphones

john@hydra:~$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 045e:0772 Microsoft Corp. LifeCam Studio
Bus 001 Device 007: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 001 Device 006: ID 0b05:17cb ASUSTek Computer, Inc. Broadcom BCM20702A0 Bluetooth
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 002: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 0d8c:0005 C-Media Electronics, Inc. Blue Snowball
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

john@hydra:~$ hciconfig -a
hci0: Type: Primary Bus: USB
 BD Address: 5C:F3:70:74:FB:30 ACL MTU: 1021:8 SCO MTU: 64:1
 UP RUNNING PSCAN
 RX bytes:66979 acl:42 sco:0 events:9483 errors:0
 TX bytes:14324277 acl:16754 sco:0 commands:1003 errors:0
 Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
 Link policy: RSWITCH SNIFF
 Link mode: SLAVE ACCEPT
 Name: 'hydra'
 Class: 0x1c0104
 Service Classes: Rendering, Capturing, Object Transfer
 Device Class: Computer, Desktop workstation
 HCI Version: 4.0 (0x6) Revision: 0x15bb
 LMP Version: 4.0 (0x6) Subversion: 0x220e
 Manufacturer: Broadcom Corporation (15)

john@hydra:~$ lsmod
Module Size Used by
rfcomm 81920 19
nf_conntrack_netlink 45056 0
nfnetlink 16384 2 nf_conntrack_netlink
xfrm_user 36864 1
xfrm_algo 16384 1 xfrm_user
xt_addrtype 16384 2
br_netfilter 28672 0
xt_CHECKSUM 16384 1
xt_MASQUERADE 20480 4
xt_conntrack 16384 2
ipt_REJECT 16384 2
nf_reject_ipv4 16384 1 ipt_REJECT
xt_tcpudp 20480 6
ip6table_mangle 16384 1
ip6table_nat 16384 1
iptable_mangle 16384 1
iptable_nat 16384 1
nf_nat 40960 3 ip6table_nat,iptable_nat,xt_MASQUERADE
nf_conntrack 139264 4 xt_conntrack,nf_nat,nf_conntrack_netlink,xt_MASQUERADE
nf_defrag_ipv6 24576 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
ebtable_filter 16384 0
ebtables 36864 1 ebtable_filter
ip6table_filter 16384 1
ip6_tables 32768 3 ip6table_filter,ip6table_nat,ip6table_mangle
iptable_filter 16384 1
bpfilter 32768 0
bridge 176128 1 br_netfilter
stp 16384 1 bridge
llc 16384 2 bridge,stp
vboxnetadp 28672 0
vboxnetflt 28672 0
vboxdrv 487424 2 vboxnetadp,vboxnetflt
aufs 262144 0
overlay 118784 0
cmac 16384 1
bnep 24576 2
uvcvideo 98304 0
btusb 57344 0
btrtl 20480 1 btusb
v4l2_common 16384 1 uvcvideo
btbcm 16384 1 btusb
videobuf2_vmalloc 20480 1 uvcvideo
btintel 24576 1 btusb
videobuf2_memops 20480 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
bluetooth 581632 51 btrtl,btintel,btbcm,bnep,btusb,rfcomm
cdc_ether 20480 0
videobuf2_common 53248 2 videobuf2_v4l2,uvcvideo
usbnet 45056 1 cdc_ether
joydev 28672 0
input_leds 16384 0
ecdh_generic 16384 2 bluetooth
snd_hda_codec_hdmi 61440 1
ecc 28672 1 ecdh_generic
r8152 65536 0
videodev 208896 4 v4l2_common,videobuf2_v4l2,uvcvideo,videobuf2_common
snd_usb_audio 245760 6
mii 20480 2 usbnet,r8152
snd_usbmidi_lib 36864 1 snd_usb_audio
mc 53248 5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common
snd_seq_midi 20480 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_hda_codec_realtek 118784 1
snd_hda_codec_generic 81920 1 snd_hda_codec_realtek
ledtrig_audio 16384 2 snd_hda_codec_generic,snd_hda_codec_realtek
snd_rawmidi 36864 2 snd_seq_midi,snd_usbmidi_lib
edac_mce_amd 32768 0
snd_hda_intel 53248 15
wl 6455296 0
snd_intel_dspcfg 24576 1 snd_hda_intel
snd_hda_codec 131072 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_core 90112 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
snd_hwdep 20480 2 snd_usb_audio,snd_hda_codec
serio_raw 20480 0
wmi_bmof 16384 0
k10temp 16384 0
snd_pcm 106496 10 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
snd 90112 50 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
cfg80211 712704 1 wl
soundcore 16384 1 snd
mac_hid 16384 0
nvidia_uvm 970752 0
kvm_amd 98304 0
ccp 94208 1 kvm_amd
kvm 659456 1 kvm_amd
irqbypass 16384 1 kvm
binfmt_misc 24576 1
sch_fq_codel 20480 4
parport_pc 40960 1
ppdev 24576 0
nfsd 380928 13
auth_rpcgss 94208 1 nfsd
nfs_acl 16384 1 nfsd
lockd 102400 1 nfsd
grace 16384 2 nfsd,lockd
lp 20480 0
sunrpc 389120 18 nfsd,auth_rpcgss,lockd,nfs_acl
parport 53248 3 parport_pc,lp,ppdev
ip_tables 32768 3 iptable_filter,iptable_nat,iptable_mangle
x_tables 40960 13 ebtables,ip6table_filter,xt_conntrack,iptable_filter,xt_tcpudp,xt_addrtype,xt_CHECKSUM,ip6_tables,ipt_REJECT,ip_tables,ip6table_mangle,xt_MASQUERADE,iptable_mangle
autofs4 45056 2
raid10 57344 0
raid456 155648 0
async_raid6_recov 24576 1 raid456
async_memcpy 20480 2 raid456,async_raid6_recov
async_pq 24576 2 raid456,async_raid6_recov
async_xor 20480 3 async_pq,raid456,async_raid6_recov
async_tx 20480 5 async_pq,async_memcpy,async_xor,raid456,async_raid6_recov
xor 24576 1 async_xor
raid6_pq 114688 3 async_pq,raid456,async_raid6_recov
libcrc32c 16384 3 nf_conntrack,nf_nat,raid456
raid0 24576 0
multipath 20480 0
linear 20480 0
hid_logitech_hidpp 40960 0
hid_logitech_dj 24576 0
uas 28672 0
usb_storage 77824 1 uas
raid1 45056 1
hid_generic 16384 0
usbhid 57344 1 hid_logitech_dj
hid 131072 4 usbhid,hid_generic,hid_logitech_dj,hid_logitech_hidpp
nvidia_drm 49152 10
nvidia_modeset 1114112 17 nvidia_drm
nvidia 20680704 772 nvidia_uvm,nvidia_modeset
drm_kms_helper 184320 1 nvidia_drm
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
pata_acpi 16384 0
firewire_ohci 40960 0
drm 491520 13 drm_kms_helper,nvidia_drm
r8169 81920 0
psmouse 155648 0
ahci 40960 4
pata_atiixp 16384 2
firewire_core 65536 1 firewire_ohci
crc_itu_t 16384 1 firewire_core
i2c_piix4 28672 0
libahci 32768 1 ahci
ipmi_devintf 20480 0
realtek 20480 1
ipmi_msghandler 106496 2 ipmi_devintf,nvidia
wmi 32768 1 wmi_bmof

john@hydra:~$ sudo hcitool con
Connections:
 > ACL D8:D4:3C:9E:DF:6D handle 11 state 1 lm MASTER AUTH ENCRYPT

john@hydra:~$ sudo hcitool name D8:D4:3C:9E:DF:6D
MDR-ZX770BN

john@hydra:~$ sudo hcitool tpl D8:D4:3C:9E:DF:6D
Current transmit power level: 10

john@hydra:~$ sudo hcitool lq D8:D4:3C:9E:DF:6D
Link quality: 255

john@hydra:~$ sudo hcitool rssi D8:D4:3C:9E:DF:6D
RSSI return value: -24

This time it took nerly four hours before it failed, and the pref managers pane insists that the headphones are connected using A2DP.

When the sound stops I get pretty much the same

john@hydra:~$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 045e:0772 Microsoft Corp. LifeCam Studio
Bus 001 Device 007: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 001 Device 006: ID 0b05:17cb ASUSTek Computer, Inc. Broadcom BCM20702A0 Bluetooth
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 002: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 0d8c:0005 C-Media Electronics, Inc. Blue Snowball
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

john@hydra:~$ hciconfig -a
hci0: Type: Primary Bus: USB
 BD Address: 5C:F3:70:74:FB:30 ACL MTU: 1021:8 SCO MTU: 64:1
 UP RUNNING PSCAN ISCAN INQUIRY
 RX bytes:2014977 acl:92 sco:0 events:287627 errors:0
 TX bytes:496849978 acl:571824 sco:0 commands:1512 errors:0
 Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
 Link policy: RSWITCH SNIFF
 Link mode: SLAVE ACCEPT
 Name: 'hydra'
 Class: 0x1c0104
 Service Classes: Rendering, Capturing, Object Transfer
 Device Class: Computer, Desktop workstation
 HCI Version: 4.0 (0x6) Revision: 0x15bb
 LMP Version: 4.0 (0x6) Subversion: 0x220e
 Manufacturer: Broadcom Corporation (15)

john@hydra:~$ lsmod
Module Size Used by
rfcomm 81920 19
nf_conntrack_netlink 45056 0
nfnetlink 16384 2 nf_conntrack_netlink
xfrm_user 36864 1
xfrm_algo 16384 1 xfrm_user
xt_addrtype 16384 2
br_netfilter 28672 0
xt_CHECKSUM 16384 1
xt_MASQUERADE 20480 4
xt_conntrack 16384 2
ipt_REJECT 16384 2
nf_reject_ipv4 16384 1 ipt_REJECT
xt_tcpudp 20480 6
ip6table_mangle 16384 1
ip6table_nat 16384 1
iptable_mangle 16384 1
iptable_nat 16384 1
nf_nat 40960 3 ip6table_nat,iptable_nat,xt_MASQUERADE
nf_conntrack 139264 4 xt_conntrack,nf_nat,nf_conntrack_netlink,xt_MASQUERADE
nf_defrag_ipv6 24576 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
ebtable_filter 16384 0
ebtables 36864 1 ebtable_filter
ip6table_filter 16384 1
ip6_tables 32768 3 ip6table_filter,ip6table_nat,ip6table_mangle
iptable_filter 16384 1
bpfilter 32768 0
bridge 176128 1 br_netfilter
stp 16384 1 bridge
llc 16384 2 bridge,stp
vboxnetadp 28672 0
vboxnetflt 28672 0
vboxdrv 487424 2 vboxnetadp,vboxnetflt
aufs 262144 0
overlay 118784 0
cmac 16384 1
bnep 24576 2
uvcvideo 98304 0
btusb 57344 0
btrtl 20480 1 btusb
v4l2_common 16384 1 uvcvideo
btbcm 16384 1 btusb
videobuf2_vmalloc 20480 1 uvcvideo
btintel 24576 1 btusb
videobuf2_memops 20480 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
bluetooth 581632 52 btrtl,btintel,btbcm,bnep,btusb,rfcomm
cdc_ether 20480 0
videobuf2_common 53248 2 videobuf2_v4l2,uvcvideo
usbnet 45056 1 cdc_ether
joydev 28672 0
input_leds 16384 0
ecdh_generic 16384 2 bluetooth
snd_hda_codec_hdmi 61440 1
ecc 28672 1 ecdh_generic
r8152 65536 0
videodev 208896 4 v4l2_common,videobuf2_v4l2,uvcvideo,videobuf2_common
snd_usb_audio 245760 6
mii 20480 2 usbnet,r8152
snd_usbmidi_lib 36864 1 snd_usb_audio
mc 53248 5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common
snd_seq_midi 20480 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_hda_codec_realtek 118784 1
snd_hda_codec_generic 81920 1 snd_hda_codec_realtek
ledtrig_audio 16384 2 snd_hda_codec_generic,snd_hda_codec_realtek
snd_rawmidi 36864 2 snd_seq_midi,snd_usbmidi_lib
edac_mce_amd 32768 0
snd_hda_intel 53248 15
wl 6455296 0
snd_intel_dspcfg 24576 1 snd_hda_intel
snd_hda_codec 131072 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_core 90112 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
snd_hwdep 20480 2 snd_usb_audio,snd_hda_codec
serio_raw 20480 0
wmi_bmof 16384 0
k10temp 16384 0
snd_pcm 106496 10 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
snd 90112 50 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
cfg80211 712704 1 wl
soundcore 16384 1 snd
mac_hid 16384 0
nvidia_uvm 970752 0
kvm_amd 98304 0
ccp 94208 1 kvm_amd
kvm 659456 1 kvm_amd
irqbypass 16384 1 kvm
binfmt_misc 24576 1
sch_fq_codel 20480 4
parport_pc 40960 1
ppdev 24576 0
nfsd 380928 13
auth_rpcgss 94208 1 nfsd
nfs_acl 16384 1 nfsd
lockd 102400 1 nfsd
grace 16384 2 nfsd,lockd
lp 20480 0
sunrpc 389120 18 nfsd,auth_rpcgss,lockd,nfs_acl
parport 53248 3 parport_pc,lp,ppdev
ip_tables 32768 3 iptable_filter,iptable_nat,iptable_mangle
x_tables 40960 13 ebtables,ip6table_filter,xt_conntrack,iptable_filter,xt_tcpudp,xt_addrtype,xt_CHECKSUM,ip6_tables,ipt_REJECT,ip_tables,ip6table_mangle,xt_MASQUERADE,iptable_mangle
autofs4 45056 2
raid10 57344 0
raid456 155648 0
async_raid6_recov 24576 1 raid456
async_memcpy 20480 2 raid456,async_raid6_recov
async_pq 24576 2 raid456,async_raid6_recov
async_xor 20480 3 async_pq,raid456,async_raid6_recov
async_tx 20480 5 async_pq,async_memcpy,async_xor,raid456,async_raid6_recov
xor 24576 1 async_xor
raid6_pq 114688 3 async_pq,raid456,async_raid6_recov
libcrc32c 16384 3 nf_conntrack,nf_nat,raid456
raid0 24576 0
multipath 20480 0
linear 20480 0
hid_logitech_hidpp 40960 0
hid_logitech_dj 24576 0
uas 28672 0
usb_storage 77824 1 uas
raid1 45056 1
hid_generic 16384 0
usbhid 57344 1 hid_logitech_dj
hid 131072 4 usbhid,hid_generic,hid_logitech_dj,hid_logitech_hidpp
nvidia_drm 49152 12
nvidia_modeset 1114112 22 nvidia_drm
nvidia 20680704 1037 nvidia_uvm,nvidia_modeset
drm_kms_helper 184320 1 nvidia_drm
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
pata_acpi 16384 0
firewire_ohci 40960 0
drm 491520 15 drm_kms_helper,nvidia_drm
r8169 81920 0
psmouse 155648 0
ahci 40960 4
pata_atiixp 16384 2
firewire_core 65536 1 firewire_ohci
crc_itu_t 16384 1 firewire_core
i2c_piix4 28672 0
libahci 32768 1 ahci
ipmi_devintf 20480 0
realtek 20480 1
ipmi_msghandler 106496 2 ipmi_devintf,nvidia
wmi 32768 1 wmi_bmof

john@hydra:~$ sudo hcitool con
Connections:
 > ACL D8:D4:3C:9E:DF:6D handle 12 state 1 lm MASTER AUTH ENCRYPT

john@hydra:~$ sudo hcitool name D8:D4:3C:9E:DF:6D
MDR-ZX770BN

john@hydra:~$ sudo hcitool tpl D8:D4:3C:9E:DF:6D
Current transmit power level: 10

At this point, if I try to break the connection from the computer and reconnect, then it will sometimes find the headphone and list it as connected, but it will not be listed in the pref manager as an ouput device.

I did that, and made listings like the previous

john@hydra:~$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 045e:0772 Microsoft Corp. LifeCam Studio
Bus 001 Device 007: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 001 Device 006: ID 0b05:17cb ASUSTek Computer, Inc. Broadcom BCM20702A0 Bluetooth
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 002: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 0d8c:0005 C-Media Electronics, Inc. Blue Snowball
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Copy-pasting the lsmod-list made the computer freeze, and I had to make a hard restart, so the error-state is now lost. It could be that something additional was unstable after the error appeared.

I provided a dump to give a bit more context on my machine. It is added as an attachment.
The actual command to generate the dump is the following, and it was run before the error appeared

{ sudo lshw | grep product | head -n1 && sudo lspci -knn | grep Net -A3 && lsusb -v; } >output.txt 2>&1

I'll see if I can make the comøputer fail once more, and will then attach the dmesg.

It isn't much here to point to the cause of the problem, but perhaps someone familiar with debugging Bluetooth/pulse-audio can point me in the right direction. In particular note hat something is changed for A2DP in Bluez 5.54, and I have not tested this version. (http://www.bluez.org/release-of-bluez-5-54-and-5-53/)

If anything else is required I will provide it to the best of my abilities, limited to any security and privacy concerns.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-07-10 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: Gigabyte Technology Co., Ltd. GA-MA78GM-S2H
Package: bluez 5.53-0ubuntu3
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic root=UUID=3c531eaa-6c4b-466a-acd5-3bf2de3b64ef ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Tags: focal
Uname: Linux 5.4.0-40-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/17/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: 12b
dmi.board.name: GA-MA78GM-S2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvr12b:bd08/17/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA78GM-S2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA78GM-S2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA78GM-S2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
hciconfig:
 hci0: Type: Primary Bus: USB
  BD Address: 5C:F3:70:74:FB:30 ACL MTU: 1021:8 SCO MTU: 64:1
  UP RUNNING
  RX bytes:1484939 acl:79 sco:0 events:211720 errors:0
  TX bytes:361322536 acl:423157 sco:0 commands:136 errors:0

John Erling Blad (jeblad) wrote :

There are several reports on the net talking about random disconnects with Bluetooth dongles reporting as BCM20702A0 and BCM20702A1, that might be important.

Win10 experience the same problems, but it seems like they are able to recover.

It seems like my HK Onyx Studio 4 has the same problem, but much less frequently. I have not tried to make any statistics though. I had a pair of Philips Bluetooth headphones that also had this problem. In short, I'm pretty sure it is not the devices that are the problem, although they may use the same chipset.

I don't experience the same problem when the sound devices are attached to Android devices.

So the problem persists over several sound devices, over several Bluetooth dongles, and over several mainboards. That should indicate that the problem somehow emerge from the system, even if Win10 seems to have fixed it to some degree.

John Erling Blad (jeblad) wrote :
Download full text (8.3 KiB)

After the crash (hid hangs, could be a side effect) this is the dmesg.0 file still existing

john@hydra:~$ tail -100 /var/log/dmesg.0
[ 7.277226] kernel: nvidia-uvm: Loaded the UVM driver, major device number 237.
[ 7.498321] kernel: cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 7.521638] kernel: cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 7.785905] kernel: snd_hda_intel 0000:00:14.2: position_fix set to 1 for device 1458:a022
[ 7.820545] kernel: MCE: In-kernel MCE decoding enabled.
[ 7.825161] kernel: EDAC amd64: Node 0: DRAM ECC disabled.
[ 7.825163] kernel: EDAC amd64: ECC disabled in the BIOS or no ECC capability, module will not load.
                        Either enable ECC checking or force module loading by setting 'ecc_enable_override'.
                        (Note that use of the override may cause unknown side effects.)
[ 7.873127] kernel: snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC889A: line_outs=4 (0x14/0x15/0x16/0x17/0x0) type:line
[ 7.873143] kernel: snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 7.873144] kernel: snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[ 7.873145] kernel: snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 7.873146] kernel: snd_hda_codec_realtek hdaudioC0D0: dig-out=0x1e/0x0
[ 7.873147] kernel: snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 7.873149] kernel: snd_hda_codec_realtek hdaudioC0D0: Rear Mic=0x18
[ 7.873150] kernel: snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19
[ 7.873152] kernel: snd_hda_codec_realtek hdaudioC0D0: Line=0x1a
[ 7.873153] kernel: snd_hda_codec_realtek hdaudioC0D0: CD=0x1c
[ 7.873154] kernel: snd_hda_codec_realtek hdaudioC0D0: dig-in=0x1f
[ 7.877268] kernel: EDAC amd64: Node 0: DRAM ECC disabled.
[ 7.877271] kernel: EDAC amd64: ECC disabled in the BIOS or no ECC capability, module will not load.
                        Either enable ECC checking or force module loading by setting 'ecc_enable_override'.
                        (Note that use of the override may cause unknown side effects.)
[ 7.885647] kernel: wlan0: Broadcom BCM43b1 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)
[ 7.885648] kernel:
[ 7.885816] kernel: snd_hda_intel 0000:01:00.1: Disabling MSI
[ 7.885827] kernel: snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 7.920552] kernel: input: HDA ATI SB Rear Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input27
[ 7.920612] kernel: input: HDA ATI SB Front Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input28
[ 7.920657] kernel: input: HDA ATI SB Line as /devices/pci0000:00/0000:00:14.2/sound/card0/input29
[ 7.920704] kernel: input: HDA ATI SB Line Out Front as /devices/pci0000:00/0000:00:14.2/sound/card0/input30
[ 7.920749] kernel: input: HDA ATI SB Line Out Surround as /devices/pci0000:00/0000:00:14.2/sound/card0/input31
[ 7.920795] kernel: input: HDA ATI SB Line Out CLFE as /devices/pci0000:00/0000:00:14.2/sound/card0/input32
[ 7.920837] kernel: input: HDA ATI SB Line Out Side as /devices/pci00...

Read more...

description: updated
Daniel van Vugt (vanvugt) wrote :

Ubuntu 19.10 is reaching end-of-life within days from now:

  https://wiki.ubuntu.com/Releases

Please reproduce the bug on either 18.04 or 20.04 and then report a new bug from that machine by running:

  ubuntu-bug bluez

Changed in bluez (Ubuntu):
status: New → Won't Fix
John Erling Blad (jeblad) wrote :

From second paragraph “I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.)”

The bug was infact the reason I updated to 19.04 and later to 19.10, but it did not go away.

Daniel van Vugt (vanvugt) wrote :

Thanks. Yes I noticed that but we still need info from a machine running a supported version of Ubuntu. So on either 18.04 or 20.04 please run this command to collect it automatically:

  apport-collect 1886714

Changed in bluez (Ubuntu):
status: Won't Fix → Incomplete

apport information

tags: added: apport-collected focal
description: updated

apport information

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Slightly different machine, running 20.04 LTS, but not too different I guess. Uses the same BT-400 dongle as the other machine, the Hama dongle seems to create additional problems even if it should use the same chip.

Also tried Fedora 32 from a live USB stick, it had the same problem.

I wonder if it somehow is triggered by sampling rate, number of bits, encoding, or something similar as it wasn't triggered while I saw “The Old Guard” but when I started “Nighfliers” it emerged pretty fast.

It seems to start with an increasing delay (lack of sync) until it fails.

When it did fail before the apport report the sound in my Bluetooth headphones stopped, but it was still connected in the Bluetooth pane in “preference”. I turned the headphones off, but they were still listed as connected. Turned them back on, still connected. Tried to manually set the output device, no change. Then ran apport-collect.

Daniel van Vugt (vanvugt) wrote :

Thanks. Please also try to describe the problem (and only one problem) in a couple of sentences or less and put that at the top of the bug.

Changed in bluez (Ubuntu):
status: Incomplete → New
John Erling Blad (jeblad) wrote :

As soon as I can get an [Asus USB BT500](https://www.asus.com/Networking/USB-BT500/) I will try that, as I suspect this issue is somehow related to the chip in the dongle. It seems like all dongles with the same chip has the same issue. The sound problem is probably (?) a secondary effect, but that is the most prominent effect.

summary: - Bluetooth disconnects, and then sound fails on reconnect
+ [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on
+ reconnect

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
tags: added: eoan
John Erling Blad (jeblad) wrote :

While waiting for a new Bluetooth dongle I messed around with some other equipment. It seems like I can't make a Herman/Kardon Onyx 4 to fail, which is a bit strange. Tried to log it with hcidump and nothing unusual showed up. Logging avdtp gave identical results.

So just to double-check what happen when I attached my Sony headphones I started hcidump and connected the headphone, and started playing a streamed movie. I see the effect of the sound breaking up, but I can't make the connection fail when hcidump is running. Usually it is enough to provoke some glitches in the connection, then delay builds up, and the phone disconnects. When that happen all devices using sound over USB dies. With hcidump running is does not die.

This is really weird, as hcidump should not change the stream in any way.

John Erling Blad (jeblad) wrote :

Several programs are updated, it could be that this works now even if the sound breaks up from time to time. I'll do some more testing.

John Erling Blad (jeblad) wrote :

If I restart and try to use my Sony headphones, then sound stutter and fails. If I run `sudo hcidump --ext avdtp`, then it works… This is weird!

John Erling Blad (jeblad) wrote :
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