linux-kernel - Re: [alsa-devel] Regression 2.6.35-rc6: ALSA Intel HDA/Realtek: missing Beep

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Date:	Thu, 29 Jul 2010 10:52:36 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Mario 'BitKoenig' Holbe" <Mario.Holbe@...Ilmenau.DE>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [alsa-devel] Regression 2.6.35-rc6: ALSA Intel HDA/Realtek: missing	Beep

At Thu, 29 Jul 2010 10:41:38 +0200,
Mario 'BitKoenig' Holbe wrote:
> 
> On Thu, Jul 29, 2010 at 10:26:22AM +0200, Takashi Iwai wrote:
> > FYI, you can change SSID by writing /sys/class/sound/hwC*D*/subsystem_id
> > file.  Then reconfigure the codec via triggering
> > /sys/class/sound/hwC*D*/reconfig.
> 
> Great, that's what I meant with "Or am I somehow able to tweak it? Is
> there a module parameter to set this SSID bit?" :)
> 
> $ for i in /sys/class/sound/hwC*D*/subsystem_id; do echo "$i: $(cat $i)"; done   
> /sys/class/sound/hwC0D0/subsystem_id: 0x1043829f
> /sys/class/sound/hwC0D1/subsystem_id: 0xffffffff
> 
> So, obviously the first check in
> 	if (ass != codec->bus->pci->subsystem_device && (ass & 1))
> is false. How can I tweak the subsystem_id least-invasive not to match
> codec->bus->pci->subsystem_device (which should be 0x829f then) anymore?

Usually the codec SSID isn't checked in other places, so passing a
bogus value should be OK.  Pass a value like 2:

	# echo -n 2 > /sys/class/sound/hwC0D0/subsystem_id
then
	# echo -n 1 > /sys/class/sound/hwC0D0/reconfig

The latter needs that the all sound device files are closed beforehand.


Takashi
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