[pulseaudio-discuss] Bluetooth connection disconnects every few minutes

[Julian Sikorski]

Hi list,

I have noticed that the bluetooth connection between my laptop (Intel
7260) and my headphones (Sennheiser Momentum Wirelless) is very
unreliable. While under Windows 10 devices stay connected for hours on
end, under Fedora 28 the connection is lost every few minutes at most.
Often the connection will be reestablished only to be lost again.
bluetoothd shows messages like:

cze 29 21:31:13 snowball2 bluetoothd[3832]: Endpoint unregistered:
sender=:1.145 path=/MediaEndpoint/A2DPSource
cze 29 21:31:13 snowball2 bluetoothd[3832]: Endpoint unregistered:
sender=:1.145 path=/MediaEndpoint/A2DPSink
cze 29 21:31:13 snowball2 bluetoothd[3832]: Endpoint registered:
sender=:1.145 path=/MediaEndpoint/A2DPSource
cze 29 21:31:13 snowball2 bluetoothd[3832]: Endpoint registered:
sender=:1.145 path=/MediaEndpoint/A2DPSink
cze 29 21:31:39 snowball2 bluetoothd[3832]:
/org/bluez/hci0/dev_00_1B_66_81_8D_76/fd5: fd(25) ready
cze 29 21:33:02 snowball2 bluetoothd[3832]: Unable to get io data for
Headset Voice gateway: getpeername: Transport endpoint is not connected
(107)
cze 29 21:33:02 snowball2 bluetoothd[3832]: Endpoint unregistered:
sender=:1.145 path=/MediaEndpoint/A2DPSource
cze 29 21:33:02 snowball2 bluetoothd[3832]: Endpoint unregistered:
sender=:1.145 path=/MediaEndpoint/A2DPSink
cze 29 21:33:03 snowball2 bluetoothd[3832]: Endpoint registered:
sender=:1.145 path=/MediaEndpoint/A2DPSource
cze 29 21:33:03 snowball2 bluetoothd[3832]: Endpoint registered:
sender=:1.145 path=/MediaEndpoint/A2DPSink
cze 29 21:33:31 snowball2 bluetoothd[3832]:
/org/bluez/hci0/dev_00_1B_66_81_8D_76/fd6: fd(25) ready
cze 29 21:35:38 snowball2 bluetoothd[3832]: Unable to get io data for
Headset Voice gateway: getpeername: Transport endpoint is not connected
(107)

dmesg for the same period looks as follows:

2018-06-29T21:30:58,743292+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:31:12,613199+02:00 usb 2-1.4: USB disconnect, device number 8
2018-06-29T21:31:12,809196+02:00 usb 2-1.4: new full-speed USB device
number 9 using ehci-pci
2018-06-29T21:31:12,889200+02:00 usb 2-1.4: New USB device found,
idVendor=8087, idProduct=07dc, bcdDevice= 0.01
2018-06-29T21:31:12,889203+02:00 usb 2-1.4: New USB device strings:
Mfr=0, Product=0, SerialNumber=0
2018-06-29T21:31:12,903435+02:00 Bluetooth: hci0: read Intel version:
3707100180012d0d2a
2018-06-29T21:31:12,903438+02:00 Bluetooth: hci0: Intel device is
already patched. patch num: 2a
2018-06-29T21:31:13,002369+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:31:28,853543+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:31:39,625447+02:00 input: 00:1B:66:81:8D:76 as
/devices/virtual/input/input31
2018-06-29T21:31:44,742251+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:32:00,746866+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:32:16,747075+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:32:32,746099+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:32:48,747212+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:33:02,403071+02:00 usb 2-1.4: USB disconnect, device number 9
2018-06-29T21:33:02,595275+02:00 usb 2-1.4: new full-speed USB device
number 10 using ehci-pci
2018-06-29T21:33:02,675493+02:00 usb 2-1.4: New USB device found,
idVendor=8087, idProduct=07dc, bcdDevice= 0.01
2018-06-29T21:33:02,675502+02:00 usb 2-1.4: New USB device strings:
Mfr=0, Product=0, SerialNumber=0
2018-06-29T21:33:02,691213+02:00 Bluetooth: hci0: read Intel version:
3707100180012d0d2a
2018-06-29T21:33:02,691216+02:00 Bluetooth: hci0: Intel device is
already patched. patch num: 2a
2018-06-29T21:33:02,791228+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:33:18,854324+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:33:31,481782+02:00 input: 00:1B:66:81:8D:76 as
/devices/virtual/input/input32
2018-06-29T21:33:34,742175+02:00 Bluetooth: hci0: last event is not cmd
complete (0x0f)
2018-06-29T21:35:37,864703+02:00 usb 2-1.4: USB disconnect, device number 10
2018-06-29T21:35:38,056428+02:00 usb 2-1.4: new full-speed USB device
number 11 using ehci-pci
2018-06-29T21:35:38,140706+02:00 usb 2-1.4: New USB device found,
idVendor=8087, idProduct=07dc, bcdDevice= 0.01
2018-06-29T21:35:38,140712+02:00 usb 2-1.4: New USB device strings:
Mfr=0, Product=0, SerialNumber=0
2018-06-29T21:35:38,155840+02:00 Bluetooth: hci0: read Intel version:
3707100180012d0d2a
2018-06-29T21:35:38,155843+02:00 Bluetooth: hci0: Intel device is
already patched. patch num: 2a

I am not sure where to look further. Does it look like an issue with
pulseaudio, or a deeper problem with linux bluetooth stack? Thanks for
your input in advance!

Best regards,
Julian