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

[Takashi Iwai <tiwai@suse.de>]

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?

If any difference is found, try to change the value by writing via
proc interface, e.g.

	echo 02 8080 > /proc/asound/card0/codec97#0/ac97#0-0+regs

(this feature is enabled only when you compile with CONFIG_SND_DEBUG)


thanks,

Takashi


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click