Re: USB sound device present but NOT visible in ‘alsamixer’
"Andrew M.A. Cater" <amacater@einval.com> writes:
>> Pankaj Jangid <pankaj@codeisgreat.org> writes:
>>
>> > When I boot system afresh, the card is visible in the ‘alsamixer’ and in
>> > Gnome settings as well. Shown as “Blue” S/PDIF input and output
>> > devices. But when system wakes up from sleep (suspended), it doesn’t
>> > show the devices.
>> >
> It might be nothing more than the power handling, sleep modes and USB
> enumeration after a laptop goes to sleep.
>
> If you unplug/replug the USB plug which is the external sound card, is
> it magically recognised again?
Thanks Andy, for the reply. I really appreciate this gesture.
And I am sorry I wasn’t complete in the original email. I had tried to
unplug and replug. But that also doesn’t list the device in ‘alsamixer’
and hence doesn’t work after a suspend/wakeup operation.
Is there a way to force the scan of USB sound devices manually if that
is not happening automatically? As I had posted earlier that ‘lsusb’ and
‘cat /proc/asound/cards’ do list the device. It is just that ALSA is not
seeing it.
Regards ~Pankaj
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