[alsa-devel] Restore state around suspend/resume

[Dan Nicholson]

On Sun, Nov 30, 2008 at 10:28 AM, Takashi Iwai <tiwai at suse.de> wrote:
> At Sun, 30 Nov 2008 09:30:37 -0800,
> Dan Nicholson wrote:
>>
>> On Sun, Nov 30, 2008 at 9:22 AM, Takashi Iwai <tiwai at suse.de> wrote:
>> > At Sun, 30 Nov 2008 09:10:32 -0800,
>> > Dan Nicholson wrote:
>> >>
>> >> On Sun, Nov 30, 2008 at 9:06 AM, Takashi Iwai <tiwai at suse.de> wrote:
>> >> > At Sun, 30 Nov 2008 08:22:49 -0800,
>> >> > Dan Nicholson wrote:
>> >> >>
>> >> >> On Sun, Nov 30, 2008 at 1:01 AM, Takashi Iwai <tiwai at suse.de> wrote:
>> >> >> > I don't know who introduced it, but maybe it was a workaround...
>> >> >>
>> >> >> Yeah, I'm sure it was a workaround, but we're trying to get rid of the
>> >> >> unnecessary ones now.
>> >> >
>> >> > Even for drivers without PM support, alsactl alone is useless.
>> >> > So I suggest you to remove it.
>> >>
>> >> I'm sorry, but why useless? It seems that it would be useful to
>> >> restore state from userspace if the driver isn't doing that on its
>> >> own.
>> >
>> > Read alsactl "alone".  Without the combination of module unloading and
>> > reloading, it's useless.
>>
>> So, are you saying that all drivers will maintain their state until
>> they are unloaded?
>
> The drivers supporting PM do it, yes.

Then, for drivers that don't support PM, won't they lose their state
across suspend? Shouldn't we save and restore it from userspace for
those drivers?

--
Dan
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