Thanks Arky.
Here is the following command:
hu...@asfaloth:~$ cat /proc/asound/cards
0 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xfe020000 irq 20
1 [default ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:0a.0-6, full
speed
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C-Media USB Headphone not connected after resuming from hibernate
https://bugs.launchpad.net/bugs/424349
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