Quando tento acessar as configurações de áudio nas configurações do sistema gnome, ele cai imediatamente. As configurações de áudio funcionaram bem após a atualização para o Ubuntu 17.10. Eu acho que isso tem algo a ver com uma atualização mais recente.
tail -f /var/log/syslog
Nov 7 17:53:15 name kernel: [ 849.626304] gnome-control-c[5497]: segfault at 7ffca64ccf3c ip 00007fd7c53cc8c6 sp 00007ffca64cce80 error 6 in libc-2.26.so[7fd7c5379000+1d6000]
uname -a
Linux name 4.13.0-16-generic #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
PS: A entrada e saída de áudio ainda funciona bem.
PPS: minha placa de som USB é a solução para esse problema. Quando eu o desconecto, as configurações do sistema funcionam normalmente. Strage é que essa placa de som sempre funcionou bem com o Linux.
Nov 7 18:12:59 name kernel: [ 2034.289019] usb 1-2.4.1: new high-speed USB device number 14 using xhci_hcd
Nov 7 18:12:59 name kernel: [ 2034.390139] usb 1-2.4.1: language id specifier not provided by device, defaulting to English
Nov 7 18:12:59 name kernel: [ 2034.390404] usb 1-2.4.1: New USB device found, idVendor=17cc, idProduct=0839
Nov 7 18:12:59 name kernel: [ 2034.390410] usb 1-2.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=5
Nov 7 18:12:59 name kernel: [ 2034.390415] usb 1-2.4.1: Product: Audio 4 DJ
Nov 7 18:12:59 name kernel: [ 2034.390419] usb 1-2.4.1: Manufacturer: Native Instruments
Nov 7 18:12:59 name kernel: [ 2034.390423] usb 1-2.4.1: SerialNumber: SN-9uohcvd9
Nov 7 18:12:59 name mtp-probe: checking bus 1, device 14: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4.1"
Nov 7 18:12:59 name mtp-probe: bus: 1, device: 14 was not an MTP device
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 4 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Successfully made thread 7458 of process 2184 (n/a) owned by '1000' RT at priority 5.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 5 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 5 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Successfully made thread 7459 of process 2184 (n/a) owned by '1000' RT at priority 5.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 6 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 6 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Successfully made thread 7460 of process 2184 (n/a) owned by '1000' RT at priority 5.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 7 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 7 threads of 1 processes of 1 users.
Nov 7 18:13:00 name rtkit-daemon[1326]: Successfully made thread 7461 of process 2184 (n/a) owned by '1000' RT at priority 5.
Nov 7 18:13:00 name rtkit-daemon[1326]: Supervising 8 threads of 1 processes of 1 users.
Nov 7 18:13:00 name gsd-media-keys[2334]: Unable to get default source
Nov 7 18:13:00 name gsd-media-keys[2334]: Unable to get default sink
Nov 7 18:13:00 name kernel: [ 2035.067640] gnome-control-c[7389]: segfault at 7fff2b1aff5c ip 00007f03332dd8c6 sp 00007fff2b1afea0 error 6 in libc-2.26.so[7f033328a000+1d6000]
Nov 7 18:13:25 name kernel: [ 2059.929186] usb 1-2.4.1: received EP1 urb->status = -71
Nov 7 18:13:25 name kernel: [ 2060.179409] usb 1-2.4.1: USB disconnect, device number 14
Nov 7 18:13:25 name gsd-media-keys[2334]: Unable to get default sink
Nov 7 18:13:25 name gsd-media-keys[2334]: Unable to get default source