linux-kernel - Re: 2.6.24-rc7, intel audio: alsa doesn't say a beep

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Date:	Tue, 08 Jan 2008 08:24:15 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Harald Dunkel <harald.dunkel@...nline.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc7, intel audio: alsa doesn't say a beep

At Mon, 07 Jan 2008 20:53:33 +0100,
Harald Dunkel wrote:
> 
> Hi folks,
> 
> Upgrading from 2.6.24-rc6 to rc7 Alsa stopped working for me. I still
> can access /dev/dsp, change the volume and so on, but the speakers
> are quiet. Moving back to rc6 there is no such problem.
> 
> Of course the config files are the same (except for some new
> CONFIG_SLABINFO variable).
> 
> 
> lspci says:
> 
> 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
> 00:1b.0 0403: 8086:284b (rev 02)
> 
> % aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
>    Subdevices: 1/1
>    Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 1: STAC92xx Digital [STAC92xx Digital]
>    Subdevices: 1/1
>    Subdevice #0: subdevice #0
> 
> 
> 
> The only difference between rc6 and rc7 in sound/pci/hda/hda_intel.c is
> this:
> 
> diff -ur linux-2.6.24-rc6/sound/pci/hda/hda_intel.c linux-2.6.24-rc7/sound/pci/hda/hda_intel.c
> --- linux-2.6.24-rc6/sound/pci/hda/hda_intel.c	2007-12-21 02:25:48.000000000 +0100
> +++ linux-2.6.24-rc7/sound/pci/hda/hda_intel.c	2008-01-06 22:45:38.000000000 +0100
> @@ -555,7 +555,8 @@
>   		}
>   		if (!chip->rirb.cmds)
>   			return chip->rirb.res; /* the last value */
> -		schedule_timeout_uninterruptible(1);
> +		udelay(10);
> +		cond_resched();
>   	} while (time_after_eq(timeout, jiffies));
> 
>   	if (chip->msi) {
> 
> 
> Do you think this could be related to the problem?

Could you revert it and check whether the problem still exists?

I hardly believe it's the culprit, but if this is the only change in
the sound subsystem...


thanks,

Takashi
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