Re: USB sound device present but NOT visible in ʽalsamixerʼ
alsactl --init
may help.
However alsa makes .lock files in /var/lock/alsa and you may find it
helpful to delete the lock file first then once card is set run alsactl
store. Those lock files sometimes prevent alsa from doing a proper
detection and change.
On Sun, 30 Jan 2022, Pankaj Jangid wrote:
> "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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