[focal] [Intel 8260] bluetooth input freezes for a few second after brief inactivity

[Tomislav]

I have a Logitech bluetooth mouse (M650) and keyboard (K380, details in the attached log). I almost never power down the laptop: I suspend and resume it.

Sometimes when I resume from suspend everything works flawlessly. Other times, there's a 2-3s "freeze" after just several seconds of input inactivity, during which moving the mouse or pressing keyboard keys gives no response. After 2-3s, all the keys pressed during the freeze suddenly appear on screen.

Restarting the bluetooth service, going to airplane mode and back or turning the mouse and keyboard on and off does not help at all.

The delay makes using these input devices barely usable.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bluez 5.53-0ubuntu3.6
ProcVersionSignature: Ubuntu 5.4.0-126.142-generic 5.4.203
Uname: Linux 5.4.0-126-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 19 11:25:13 2022
InstallationDate: Installed on 2017-02-18 (2068 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: Dell Inc. Latitude E5570
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-126-generic root=UUID=2b559de5-44d4-4f98-a211-a39edbb31bc8 ro quiet splash vt.handoff=7
SourcePackage: bluez
UpgradeStatus: Upgraded to focal on 2022-08-02 (77 days ago)
dmi.bios.date: 10/02/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.21.6
dmi.board.name: 03MCRF
dmi.board.vendor: Dell Inc.
dmi.board.version: A09
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.21.6:bd10/02/2019:svnDellInc.:pnLatitudeE5570:pvr:rvnDellInc.:rn03MCRF:rvrA09:cvnDellInc.:ct9:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude E5570
dmi.product.sku: 06DF
dmi.sys.vendor: Dell Inc.
hciconfig:
 hci0: Type: Primary Bus: USB
  BD Address: B8:8A:60:C5:C9:BF ACL MTU: 1021:4 SCO MTU: 96:6
  UP RUNNING PSCAN ISCAN
  RX bytes:34304 acl:977 sco:0 events:2580 errors:0
  TX bytes:603917 acl:73 sco:0 commands:2473 errors:0
mtime.conffile..etc.bluetooth.main.conf: 2022-10-19T11:24:40.907104

[Daniel van Vugt (vanvugt)]

There certainly are Bluetooth errors in the log, and some are kernel related.

I suggest the best thing to do here is to try a newer Ubuntu release like 22.04.1. Because there's a good chance this was a bug in the kernel, Intel firmware, or BlueZ that has already been fixed.