Re: Re: ALC658 rev 0 - a problem with Rear Right

[Dan Aloni <da-x@colinux.org>]

On Mon, Mar 07, 2005 at 08:13:16PM +0100, Takashi Iwai wrote:
> At Mon, 7 Mar 2005 20:55:14 +0200,
> Dan Aloni wrote:
> > 
> > On Mon, Mar 07, 2005 at 07:28:28PM +0100, Takashi Iwai wrote:
> > > At Mon, 7 Mar 2005 20:24:14 +0200,
> > > Dan Aloni wrote:
> > > > 
> > > > On Mon, Mar 07, 2005 at 06:13:44PM +0100, Takashi Iwai wrote:
> > > > > At Mon, 7 Mar 2005 18:57:02 +0200,
> > > > > Dan Aloni wrote:
> > > > > > 
> > > > > > On Mon, Mar 07, 2005 at 05:33:56PM +0100, Takashi Iwai wrote:
> > > > > > > At Mon, 7 Mar 2005 17:39:21 +0200,
> > > > > > > Dan Aloni wrote:
> > > > > > > > 
> > > > > > > > On Mon, Mar 07, 2005 at 02:10:14PM +0100, Clemens Ladisch wrote:
> > > > > > > > > Dan Aloni wrote:
> > > > > > > > > > The problem was introduced in the following changeset, which
> > > > > > > > > > was supposed to cleanup things but accidently broke something.
> > > > > > > > > >
> > > > > > > > > > "[ALSA] Clean up and fix stereo mutes" :
> > > > > > > > > 
> > > > > > > > > Most AC'97 codecs have one mute bit for both channels, but some can
> > > > > > > > > have one for each channel (that's called "stereo mute").
> > > > > > > > > 
> > > > > > > > > It seems the new driver enables the stereo mute bits, but then forgets
> > > > > > > > > to unmute the second channel.
> > > > > > > > > 
> > > > > > > > > Does anything happen if you toggle both mute bits in alsamixer?
> > > > > > > > 
> > > > > > > > Using alsamixer I am unable to mute any channel by itself - it 
> > > > > > > > always mutes or unmutes boths channels at the same time (I tried
> > > > > > > > any possible combination of m M, < or >). However if I revert the
> > > > > > > > changeset I am able to control each channel alone using < or > and
> > > > > > > > there's no problem.
> > > > > > > 
> > > > > > > Hmm, are you sure that it's ALC658?  AFAIK, the codec doesn't  support
> > > > > > > the stereo mutes (at least ALSA code doesn't enable it).
> > > > > > 
> > > > > > Unless the driver misidentifies the chipset, this is ALC658.
> > > > > 
> > > > > Oh yes, indeed.  It's strange that the older version did have the
> > > > > stereo mute controls.
> > > > > 
> > > > > Could you compare the contents of
> > > > > /proc/asound/card0/codec97#0/ac97#0-0+regs file between the older
> > > > > ("working") and the latest versions?
> > > > 
> > > > I compared and saw no changes in the registers between the latest version 
> > > > and my version with the reverted changeset.
> > > 
> > > Hmm, interesting.
> > > 
> > > Just to be sure (I'm back from the travel shortly ago, so might be
> > > missing something):  the problem persists only on the surround right
> > > channel?
> > 
> > Yes, only that channel.
> >  
> > > And you could mute on/off of "Surround" left/right channels via
> > > alsamixer independently in the older version?
> > 
> > I can only mute both at the same time with the latest version, but I 
> > can mute each channel alone with the working version.
>[..]
> 
> OK.  Then please try the attached patch.  This will enable the stereo
> mutes on the surround volume control again.
> 

Works. Thanks,

-- 
Dan Aloni
da-x@colinux.org


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