linux-kernel - Re: Longstanding bug in ac97/intel8x0 resume/init

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Date:	Tue, 01 Jul 2008 15:43:56 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Mathieu Chouquet-Stringer <mchouque@...e.fr>
Cc:	hannes@...urebad.de (Johannes Weiner),
	Jaroslav Kysela <perex@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: Longstanding bug in ac97/intel8x0 resume/init

At 30 Jun 2008 20:58:03 +0200,
Mathieu Chouquet-Stringer wrote:
> 
>         Hey there,
> 
> hannes@...urebad.de (Johannes Weiner) writes:
> > Johannes Weiner <hannes@...urebad.de> writes:
> > > my laptop has muted sound after resuming the soundcard (by
> > > s2ram/hibernation).  The problem seems to be that the cached register
> > > values are not written back to the device properly.
> 
> I've got the same exact issue on a Thinkpad T30:
> 
>  0 [I82801CAICH3   ]: ICH - Intel 82801CA-ICH3
>                       Intel 82801CA-ICH3 with AD1881A at irq 5
> 
> 00:1f.5 Multimedia audio controller: Intel Corporation 82801CA/CAM AC'97 Audio Controller (rev 02)

Does this happen for both hibernation and S2RAM?
And, resetting the mixer repairs the mute state, right?
If yes, the problem appears independently from the codec chip.  Hmm...


thanks,

Takashi
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