[alsa-devel] Mic Boost control problem with snd-hda-intel codec AL662 rev 1

Anisse Astier anisse at astier.eu
Wed Jan 13 18:45:25 CET 2010

On Tue, 12 Jan 2010 12:43:13 +0100, Takashi Iwai <tiwai at suse.de> wrote :

> At Wed, 6 Jan 2010 16:43:38 +0100,
> Anisse Astier wrote:
> > 
> > Hi,
> > 
> > The Mic Boost control on a laptop seems to behave incorrectly. The
> > control has the flag "volume" instead of "cvolume", causing it to appear
> > in both the "Playback" and "Capture" tabs of alsamixer.
> > This wouldn't be a problem if it would just work in the Capture tab: it
> > doesn't.
> > When I modify it in Capture, it doesn't retain its value: it's gone after
> > i close alsamixer. But if i modify it in "Playback" it will retain its
> > value and the value will be mirrored by the Mic Boost in Capture (both
> > Mic Boost seem to reflect the same control, except one is RO, the other
> > is RW).
> > 
> > It's a minor a annoyance, but I'd like to fix it and have "Mic Boost"
> > appear only as a Capture control and retaining its value. Maybe I should
> > create a new mixer configuration for this hardware in patch_realtek.c, but
> > I don't know where to start. Bios autoprobing works for everything but
> > just what I mentioned.
> Well, Mic Boost is applied to both playback and capture in case you
> have analog loopback.  So, it's not entirely wrong.
> The problem is rather the inconsistent behavior in alsamixer.
> I guess it's a bug of old alsa-lib.  Try to upgrade the alsa-lib and
> alsa-utils first.

You were right, problem goes away after upgrading userland lib and utils.



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