linux-kernel - Re: regression in 2.6.30-rc6 -- via82xx sound very quiet

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Message-ID: <s5hmy9aete1.wl%tiwai@suse.de>
Date:	Mon, 18 May 2009 09:56:38 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Richard Kennedy <richard@....demon.co.uk>
Cc:	perex@...ex.cz, lkml <linux-kernel@...r.kernel.org>
Subject: Re: regression in 2.6.30-rc6 -- via82xx sound very quiet

At Mon, 18 May 2009 08:52:34 +0100,
Richard Kennedy wrote:
> 
> On Mon, 2009-05-18 at 08:04 +0200, Takashi Iwai wrote:
> > At Sun, 17 May 2009 21:38:03 +0100,
> > Richard Kennedy wrote:
> > > 
> > > On Sun, 2009-05-17 at 19:16 +0200, Takashi Iwai wrote:
> > > > At Sun, 17 May 2009 17:47:54 +0100,
> > > > Richard Kennedy wrote:
> > > > > 
> > > > > In the current git 2.6.30-rc6 the sound from my motherboard has become
> > > > > extremely quiet, I have to turn my speakers up all the way to hear
> > > > > anything at all.
> > > > > I'm not too sure when the problem first started but I've just tested
> > > > > 2.6.30-rc4 and it works correctly.  
> > > > 
> > > > Try to correct "DXS Playback Volume" mixer elements.
> > > > The dB range of these volumes were fixed recently to the correct
> > > > values.  If the old mixer value is restored using the dB value,
> > > > it would be restored to a much lower value, which explains your
> > > > symptom.
> > > > 
> > > > Simply set these volumes to the max (i.e. 0dB) and never change unless
> > > > you really need them.
> > > > 
> > > > 
> > > > thanks,
> > > > 
> > > > Takashi
> > > 
> > > Hi Takashi,
> > > 
> > > thanks for that. Yes that works.
> > 
> > Thanks for checking.
> > 
> > > I didn't even know I had that control, so I guess this could be a common
> > > problem.
> > 
> > Yes, unfortunately, it would hit to many via82xx ac97 chips.
> > As the original value was wrong, it can't be corrected so easily from
> > the driver side.  Manual corrections seem needed, but just only once.
> > 
> > 
> > Takashi
> 
> Yes it's easy to do.
> But it would be nice if we could give the users a hint as to what's gone
> wrong. Would it be ok to add a log message at startup ? 
> 
> something like "your DXS volume control may need reseting".

Unfortunately this can't be detected by the system because the old
stored value is still a valid value, just less than expected.

But yes, we might need to inform this somewhere in a better place.


Takashi
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