[alsa-devel] Restore state around suspend/resume

Takashi Iwai tiwai at suse.de
Sun Nov 30 10:01:50 CET 2008

At Sat, 29 Nov 2008 12:40:02 -0800,
Dan Nicholson wrote:
> Hi,
> Currently, suspending the computer via pm-suspend (as done from HAL),
> causes the ALSA state to be stored and restored via alsactl. Here's
> what the hook looks like:
> http://cgit.freedesktop.org/pm-utils/tree/pm/sleep.d/65alsa
> Is this still necessary on recent kernels? Is there a list of drivers
> which properly maintain state across suspend/resume? We're trying to
> cut down on the amount of work done in userspace which slows down
> suspend cycles.

The all drivers with PM support should have do store/restore the
mixer states.  For such drivers, calling alsactl is just a waste of

I don't know who introduced it, but maybe it was a workaround...

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