Digging further while still in the same session (i.e. I haven't rebooted since my last comments): - issuing phablet-flash a second time succeeded, - issuing it a third time triggered the bug again with the following syslog entries: Jun 6 09:45:16 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.289 path=/MediaEndpoint/HFPAG Jun 6 09:45:16 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.289 path=/MediaEndpoint/HFPHS Jun 6 09:45:16 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.289 path=/MediaEndpoint/A2DPSource Jun 6 09:45:16 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.289 path=/MediaEndpoint/A2DPSink Jun 6 09:46:09 saw kernel: [ 4078.892767] usb 2-4.2: USB disconnect, device number 18 Jun 6 09:46:10 saw kernel: [ 4079.098248] usb 2-4.2: new high-speed USB device number 22 using ehci-pci Jun 6 09:46:10 saw kernel: [ 4079.202128] usb 2-4.2: New USB device found, idVendor=18d1, idProduct=d002 Jun 6 09:46:10 saw kernel: [ 4079.202132] usb 2-4.2: New USB device strings: Mfr=2, Product=3, SerialNumber=4 Jun 6 09:46:10 saw kernel: [ 4079.202133] usb 2-4.2: Product: Nexus 7 Jun 6 09:46:10 saw kernel: [ 4079.202135] usb 2-4.2: Manufacturer: Asus Jun 6 09:46:10 saw kernel: [ 4079.202136] usb 2-4.2: SerialNumber: 015d21d4fd581613 Jun 6 09:46:10 saw mtp-probe: checking bus 2, device 22: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.2" Jun 6 09:46:10 saw mtp-probe: bus: 2, device: 22 was not an MTP device Jun 6 09:46:12 saw kernel: [ 4081.450706] usb 2-4.2: USB disconnect, device number 22 Jun 6 09:46:22 saw kernel: [ 4091.112029] usb 2-4.2: new high-speed USB device number 23 using ehci-pci Jun 6 09:46:22 saw kernel: [ 4091.215437] usb 2-4.2: New USB device found, idVendor=18d1, idProduct=d001 Jun 6 09:46:22 saw kernel: [ 4091.215442] usb 2-4.2: New USB device strings: Mfr=2, Product=3, SerialNumber=4 Jun 6 09:46:22 saw kernel: [ 4091.215445] usb 2-4.2: Product: Nexus 7 Jun 6 09:46:22 saw kernel: [ 4091.215448] usb 2-4.2: Manufacturer: Asus Jun 6 09:46:22 saw kernel: [ 4091.215451] usb 2-4.2: SerialNumber: 015d21d4fd581613 Jun 6 09:46:22 saw mtp-probe: checking bus 2, device 23: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.2" Jun 6 09:46:22 saw mtp-probe: bus: 2, device: 23 was not an MTP device Jun 6 09:51:08 saw kernel: [ 4377.388040] usb 2-4.2: USB disconnect, device number 23 Jun 6 09:51:19 saw kernel: [ 4388.072602] usb 2-4.2: new high-speed USB device number 24 using ehci-pci Jun 6 09:51:19 saw kernel: [ 4388.177101] usb 2-4.2: New USB device found, idVendor=18d1, idProduct=d002 Jun 6 09:51:19 saw kernel: [ 4388.177107] usb 2-4.2: New USB device strings: Mfr=2, Product=3, SerialNumber=4 Jun 6 09:51:19 saw kernel: [ 4388.177110] usb 2-4.2: Product: Nexus 7 Jun 6 09:51:19 saw kernel: [ 4388.177113] usb 2-4.2: Manufacturer: Asus Jun 6 09:51:19 saw kernel: [ 4388.177116] usb 2-4.2: SerialNumber: 015d21d4fd581613 Jun 6 09:51:19 saw mtp-probe: checking bus 2, device 24: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.2" Jun 6 09:51:19 saw mtp-probe: bus: 2, device: 24 was not an MTP device At that point, I realized I never mentioned that both the bt dongle and the nexus7 are plugged on a usb hub which is provided by my ASUS screen. So I unplugged the bt dongle and plugged it directly on the PC : Jun 6 09:58:55 saw kernel: [ 4843.930748] hub 2-4:1.0: port 4 disabled by hub (EMI?), re-enabling... Jun 6 09:58:55 saw kernel: [ 4843.931724] usb 2-4.4: USB disconnect, device number 20 Jun 6 09:58:55 saw bluetoothd[1853]: Adapter /org/bluez/1853/hci0 has been disabled Jun 6 09:58:55 saw bluetoothd[1853]: Unregister path: /org/bluez/1853/hci0 Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/A2DPSink Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/A2DPSource Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/HFPAG Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/HFPHS Jun 6 09:58:56 saw kernel: [ 4844.484860] usb 2-4.4: new full-speed USB device number 25 using ehci-pci Jun 6 09:58:56 saw kernel: [ 4844.660604] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:56 saw kernel: [ 4844.948479] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:56 saw kernel: [ 4845.124453] usb 2-4.4: new full-speed USB device number 26 using ehci-pci Jun 6 09:58:56 saw kernel: [ 4845.304179] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:57 saw kernel: [ 4845.595694] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:57 saw kernel: [ 4845.771570] usb 2-4.4: new full-speed USB device number 27 using ehci-pci Jun 6 09:58:57 saw kernel: [ 4845.908583] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:57 saw kernel: [ 4846.140134] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:57 saw kernel: [ 4846.315127] usb 2-4.4: new full-speed USB device number 28 using ehci-pci Jun 6 09:58:58 saw kernel: [ 4846.454221] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:58 saw kernel: [ 4846.691753] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:58 saw kernel: [ 4846.794646] hub 2-4:1.0: unable to enumerate USB device on port 4 Jun 6 09:59:01 saw CRON[12563]: (vila) CMD (fetchmail -q >/dev/null 2>&1) Jun 6 10:00:01 saw CRON[12583]: (vila) CMD (fetchmail -d 900) Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] sink.c: Default and alternate sample rates are the same. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] source.c: Default and alternate sample rates are the same. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] socket-server.c: bind(): Address already in use Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] module.c: Failed to load module "module-esound-protocol-unix" (argument: ""): initialization failed. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] main.c: Module load failed. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] main.c: Failed to initialize daemon. Jun 6 10:00:07 saw pulseaudio[12603]: [pulseaudio] main.c: Daemon startup failed. Jun 6 10:00:07 saw kernel: [ 4915.548111] hub 2-4:1.0: port 1 disabled by hub (EMI?), re-enabling... Jun 6 10:00:07 saw kernel: [ 4915.549108] usb 2-4.1: USB disconnect, device number 21 Jun 6 10:00:07 saw kernel: [ 4915.814894] usb 2-4.1: new full-speed USB device number 29 using ehci-pci Jun 6 10:00:07 saw kernel: [ 4916.010620] usb 2-4.1: unable to read config index 0 descriptor/all Jun 6 10:00:07 saw kernel: [ 4916.010624] usb 2-4.1: can't read configurations, error -71 Jun 6 10:00:07 saw kernel: [ 4916.082529] usb 2-4.1: new full-speed USB device number 30 using ehci-pci Jun 6 10:00:07 saw kernel: [ 4916.223449] usb 2-4.1: unable to read config index 0 descriptor/all Jun 6 10:00:07 saw kernel: [ 4916.223456] usb 2-4.1: can't read configurations, error -71 Jun 6 10:00:08 saw kernel: [ 4916.298159] usb 2-4.1: new full-speed USB device number 31 using ehci-pci Jun 6 10:00:08 saw kernel: [ 4916.371698] usb 2-4.1: New USB device found, idVendor=046d, idProduct=0a29 Jun 6 10:00:08 saw kernel: [ 4916.371705] usb 2-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jun 6 10:00:08 saw kernel: [ 4916.371710] usb 2-4.1: Product: Logitech Wireless Headset Jun 6 10:00:08 saw kernel: [ 4916.371714] usb 2-4.1: Manufacturer: Logitech Jun 6 10:00:08 saw kernel: [ 4916.371720] usb 2-4.1: SerialNumber: 000D44B9634F Jun 6 10:00:08 saw kernel: [ 4916.451491] input: Logitech Logitech Wireless Headset as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1/2-4.1:1.3/input/input33 Jun 6 10:00:08 saw kernel: [ 4916.451860] hid-generic 0003:046D:0A29.0017: input,hiddev0,hidraw6: USB HID v1.11 Device [Logitech Logitech Wireless Headset] on usb-0000:00:1d.7-4.1/input3 Jun 6 10:00:08 saw mtp-probe: checking bus 2, device 31: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1" Jun 6 10:00:08 saw mtp-probe: bus: 2, device: 31 was not an MTP device Jun 6 10:00:08 saw pulseaudio[4370]: [pulseaudio] sink.c: Default and alternate sample rates are the same. Jun 6 10:00:08 saw rtkit-daemon[3197]: Successfully made thread 12667 of process 4370 (n/a) owned by '1000' RT at priority 5. Jun 6 10:00:08 saw rtkit-daemon[3197]: Supervising 5 threads of 1 processes of 1 users. Jun 6 10:00:08 saw pulseaudio[4370]: [pulseaudio] source.c: Default and alternate sample rates are the same. Jun 6 10:00:08 saw rtkit-daemon[3197]: Successfully made thread 12668 of process 4370 (n/a) owned by '1000' RT at priority 5. Jun 6 10:00:08 saw rtkit-daemon[3197]: Supervising 6 threads of 1 processes of 1 users. Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-sink] alsa-util.c: Got POLLNVAL from ALSA Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-source] alsa-util.c: Got POLLNVAL from ALSA Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-sink] alsa-util.c: Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): No such device Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-source] alsa-util.c: Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): No such device Jun 6 10:00:08 saw kernel: [ 4916.570979] hub 2-4:1.0: port 1 disabled by hub (EMI?), re-enabling... Jun 6 10:00:08 saw kernel: [ 4916.572000] usb 2-4.1: USB disconnect, device number 31 Jun 6 10:00:08 saw kernel: [ 4916.874025] usb 2-4.1: new full-speed USB device number 32 using ehci-pci Jun 6 10:00:08 saw kernel: [ 4917.020992] usb 2-4.1: New USB device found, idVendor=046d, idProduct=0a29 Jun 6 10:00:08 saw kernel: [ 4917.020998] usb 2-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jun 6 10:00:08 saw kernel: [ 4917.021001] usb 2-4.1: Product: Logitech Wireless Headset Jun 6 10:00:08 saw kernel: [ 4917.021004] usb 2-4.1: Manufacturer: Logitech Jun 6 10:00:08 saw kernel: [ 4917.021007] usb 2-4.1: SerialNumber: 000D44B9634F Jun 6 10:00:08 saw kernel: [ 4917.107687] input: Logitech Logitech Wireless Headset as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1/2-4.1:1.3/input/input34 Jun 6 10:00:08 saw kernel: [ 4917.107959] hid-generic 0003:046D:0A29.0018: input,hiddev0,hidraw6: USB HID v1.11 Device [Logitech Logitech Wireless Headset] on usb-0000:00:1d.7-4.1/input3 Jun 6 10:00:08 saw mtp-probe: checking bus 2, device 32: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1" Jun 6 10:00:08 saw mtp-probe: bus: 2, device: 32 was not an MTP device Jun 6 10:00:08 saw kernel: [ 4917.158749] 32:2:1: cannot set freq 48000 to ep 0x3 Jun 6 10:00:08 saw kernel: [ 4917.162719] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.181111] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.185105] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.189221] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.193203] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.197234] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.201258] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.205221] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.209205] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.213176] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.217200] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.221212] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.225342] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.229370] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.233455] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.237421] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.241421] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.245400] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.249442] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.253392] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.257462] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.261404] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.265328] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.269253] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.273323] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.277247] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.281272] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.285290] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.289284] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.293276] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.297265] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.301312] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.305416] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.309384] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.313360] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.317338] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.321385] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.325347] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.329333] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.333348] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.337366] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.341318] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.345331] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.349330] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.353356] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.357304] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.361316] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.365316] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.369336] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.373308] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.377333] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.381302] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.385327] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.389296] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.393323] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.397331] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.401322] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.405282] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.409309] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.413278] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.417299] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.421247] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.425288] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.429281] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.433323] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.437229] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.441300] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.445267] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.449316] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.453368] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.457411] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.461362] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.471402] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.475347] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.479373] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.483326] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.487402] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.491371] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.495395] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.499305] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.503391] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.507297] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.511385] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.515290] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.519378] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.523411] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.527468] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.531406] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.535403] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.539545] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.543537] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.547555] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.551528] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.555528] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.559551] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.563551] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.567525] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.571664] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.575630] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.579642] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.583652] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.587652] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.591654] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.595596] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.599681] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.603601] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.607609] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.611585] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.615600] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.619608] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:09 saw kernel: [ 4917.623593] 32:1:1: usb_set_interface failed (-71) Jun 6 10:00:09 saw kernel: [ 4917.627571] usb 2-4: clear tt 1 (0200) error -71 And then the dongle popped up: Jun 6 09:58:55 saw kernel: [ 4843.930748] hub 2-4:1.0: port 4 disabled by hub (EMI?), re-enabling... Jun 6 09:58:55 saw kernel: [ 4843.931724] usb 2-4.4: USB disconnect, device number 20 Jun 6 09:58:55 saw bluetoothd[1853]: Adapter /org/bluez/1853/hci0 has been disabled Jun 6 09:58:55 saw bluetoothd[1853]: Unregister path: /org/bluez/1853/hci0 Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/A2DPSink Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/A2DPSource Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/HFPAG Jun 6 09:58:55 saw bluetoothd[1853]: Endpoint unregistered: sender=:1.57 path=/MediaEndpoint/HFPHS Jun 6 09:58:56 saw kernel: [ 4844.484860] usb 2-4.4: new full-speed USB device number 25 using ehci-pci Jun 6 09:58:56 saw kernel: [ 4844.660604] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:56 saw kernel: [ 4844.948479] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:56 saw kernel: [ 4845.124453] usb 2-4.4: new full-speed USB device number 26 using ehci-pci Jun 6 09:58:56 saw kernel: [ 4845.304179] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:57 saw kernel: [ 4845.595694] usb 2-4.4: device descriptor read/64, error -71 Jun 6 09:58:57 saw kernel: [ 4845.771570] usb 2-4.4: new full-speed USB device number 27 using ehci-pci Jun 6 09:58:57 saw kernel: [ 4845.908583] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:57 saw kernel: [ 4846.140134] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:57 saw kernel: [ 4846.315127] usb 2-4.4: new full-speed USB device number 28 using ehci-pci Jun 6 09:58:58 saw kernel: [ 4846.454221] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:58 saw kernel: [ 4846.691753] usb 2-4.4: device descriptor read/8, error -71 Jun 6 09:58:58 saw kernel: [ 4846.794646] hub 2-4:1.0: unable to enumerate USB device on port 4 Jun 6 09:59:01 saw CRON[12563]: (vila) CMD (fetchmail -q >/dev/null 2>&1) Jun 6 10:00:01 saw CRON[12583]: (vila) CMD (fetchmail -d 900) Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] sink.c: Default and alternate sample rates are the same. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] source.c: Default and alternate sample rates are the same. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] socket-server.c: bind(): Address already in use Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] module.c: Failed to load module "module-esound-protocol-unix" (argument: ""): initialization failed. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] main.c: Module load failed. Jun 6 10:00:07 saw pulseaudio[12606]: [pulseaudio] main.c: Failed to initialize daemon. Jun 6 10:00:07 saw pulseaudio[12603]: [pulseaudio] main.c: Daemon startup failed. Jun 6 10:00:07 saw kernel: [ 4915.548111] hub 2-4:1.0: port 1 disabled by hub (EMI?), re-enabling... Jun 6 10:00:07 saw kernel: [ 4915.549108] usb 2-4.1: USB disconnect, device number 21 Jun 6 10:00:07 saw kernel: [ 4915.814894] usb 2-4.1: new full-speed USB device number 29 using ehci-pci Jun 6 10:00:07 saw kernel: [ 4916.010620] usb 2-4.1: unable to read config index 0 descriptor/all Jun 6 10:00:07 saw kernel: [ 4916.010624] usb 2-4.1: can't read configurations, error -71 Jun 6 10:00:07 saw kernel: [ 4916.082529] usb 2-4.1: new full-speed USB device number 30 using ehci-pci Jun 6 10:00:07 saw kernel: [ 4916.223449] usb 2-4.1: unable to read config index 0 descriptor/all Jun 6 10:00:07 saw kernel: [ 4916.223456] usb 2-4.1: can't read configurations, error -71 Jun 6 10:00:08 saw kernel: [ 4916.298159] usb 2-4.1: new full-speed USB device number 31 using ehci-pci Jun 6 10:00:08 saw kernel: [ 4916.371698] usb 2-4.1: New USB device found, idVendor=046d, idProduct=0a29 Jun 6 10:00:08 saw kernel: [ 4916.371705] usb 2-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jun 6 10:00:08 saw kernel: [ 4916.371710] usb 2-4.1: Product: Logitech Wireless Headset Jun 6 10:00:08 saw kernel: [ 4916.371714] usb 2-4.1: Manufacturer: Logitech Jun 6 10:00:08 saw kernel: [ 4916.371720] usb 2-4.1: SerialNumber: 000D44B9634F Jun 6 10:00:08 saw kernel: [ 4916.451491] input: Logitech Logitech Wireless Headset as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1/2-4.1:1.3/input/input33 Jun 6 10:00:08 saw kernel: [ 4916.451860] hid-generic 0003:046D:0A29.0017: input,hiddev0,hidraw6: USB HID v1.11 Device [Logitech Logitech Wireless Headset] on usb-0000:00:1d.7-4.1/input3 Jun 6 10:00:08 saw mtp-probe: checking bus 2, device 31: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1" Jun 6 10:00:08 saw mtp-probe: bus: 2, device: 31 was not an MTP device Jun 6 10:00:08 saw pulseaudio[4370]: [pulseaudio] sink.c: Default and alternate sample rates are the same. Jun 6 10:00:08 saw rtkit-daemon[3197]: Successfully made thread 12667 of process 4370 (n/a) owned by '1000' RT at priority 5. Jun 6 10:00:08 saw rtkit-daemon[3197]: Supervising 5 threads of 1 processes of 1 users. Jun 6 10:00:08 saw pulseaudio[4370]: [pulseaudio] source.c: Default and alternate sample rates are the same. Jun 6 10:00:08 saw rtkit-daemon[3197]: Successfully made thread 12668 of process 4370 (n/a) owned by '1000' RT at priority 5. Jun 6 10:00:08 saw rtkit-daemon[3197]: Supervising 6 threads of 1 processes of 1 users. Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-sink] alsa-util.c: Got POLLNVAL from ALSA Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-source] alsa-util.c: Got POLLNVAL from ALSA Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-sink] alsa-util.c: Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): No such device Jun 6 10:00:08 saw pulseaudio[4370]: [alsa-source] alsa-util.c: Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): No such device Jun 6 10:00:08 saw kernel: [ 4916.570979] hub 2-4:1.0: port 1 disabled by hub (EMI?), re-enabling... Jun 6 10:00:08 saw kernel: [ 4916.572000] usb 2-4.1: USB disconnect, device number 31 Jun 6 10:00:08 saw kernel: [ 4916.874025] usb 2-4.1: new full-speed USB device number 32 using ehci-pci Jun 6 10:00:08 saw kernel: [ 4917.020992] usb 2-4.1: New USB device found, idVendor=046d, idProduct=0a29 Jun 6 10:00:08 saw kernel: [ 4917.020998] usb 2-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jun 6 10:00:08 saw kernel: [ 4917.021001] usb 2-4.1: Product: Logitech Wireless Headset Jun 6 10:00:08 saw kernel: [ 4917.021004] usb 2-4.1: Manufacturer: Logitech Jun 6 10:00:08 saw kernel: [ 4917.021007] usb 2-4.1: SerialNumber: 000D44B9634F Jun 6 10:00:08 saw kernel: [ 4917.107687] input: Logitech Logitech Wireless Headset as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1/2-4.1:1.3/input/input34 Jun 6 10:00:08 saw kernel: [ 4917.107959] hid-generic 0003:046D:0A29.0018: input,hiddev0,hidraw6: USB HID v1.11 Device [Logitech Logitech Wireless Headset] on usb-0000:00:1d.7-4.1/input3 Jun 6 10:00:08 saw mtp-probe: checking bus 2, device 32: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.1" Jun 6 10:00:08 saw mtp-probe: bus: 2, device: 32 was not an MTP device Jun 6 10:00:08 saw kernel: [ 4917.158749] 32:2:1: cannot set freq 48000 to ep 0x3 Jun 6 10:00:08 saw kernel: [ 4917.162719] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.181111] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.185105] 32:2:1: usb_set_interface failed (-71) Jun 6 10:00:08 saw kernel: [ 4917.189221] usb 2-4: clear tt 1 (0200) error -71 Jun 6 10:00:08 saw kernel: [ 4917.193203] 32:2:1: usb_set_interface failed (-71) So the issue "may" come from the screen usb hub ?