linux-kernel - Re: [BUG] no sound on ppc mac mini

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Date:	Wed, 06 Sep 2006 10:50:51 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	lkml <linux-kernel@...r.kernel.org>, Takashi Iwai <tiwai@...e.de>
Subject: Re: [BUG] no sound on ppc mac mini

> However...  ;)
> 
> It seems the new device doesn't have any volume control. I know the old
> toonie driver used some form of softvol support, but "it just worked",
> where as now I have no control over my system's audio volume.

It's a userland problem :) Your alsa config needs to enable the softvol
plugin for it.

> While not the most terrible of regressions, its a bit irritating (waking
> to loud mail notifications, specifically :). Is this something that I
> have to wait for an alsa userland update to fix, or is the new kernel
> driver just not fully functional yet?

Part of the problem is that you can't anymore identify the type of codec
based on the card name thus Alsa old mecanism of having a specific
toonie config file that includes softvol doesn't work any more. The
trick was bad in the first place though because you can have multiple
different codecs anyway, so it didn't scale. (The old driver couldn't
deal with it, but the new one can, though we haven't yet implemented
support for any of the topaz digital codecs).

I remember a discussion with the Alsa folks where it was question to
have Alsa userland automatically instanciate softvol if there is no
volume provided by the driver, which is a better approach.

Takashi, was this ever implemented ? John, what is your Alsa userland
version ?

Ben.

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