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

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Message-ID: <s5hhczlnqex.wl%tiwai@suse.de>
Date:	Wed, 06 Sep 2006 14:13:58 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	john stultz <johnstul@...ibm.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Johannes Berg <johannes@...solutions.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] no sound on ppc mac mini

At Tue, 05 Sep 2006 18:08:44 -0700,
john stultz wrote:
> 
> On Wed, 2006-09-06 at 10:50 +1000, Benjamin Herrenschmidt wrote:
> > > 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.
> 
> Yea. I figured. :( I've played around a bit w/ the .asoundrc file to
> re-enable softvol (A similar hack was needed originally after the toonie
> driver went in), but so far I've been unsuccessful.

I guess adding the following to /usr/share/alsa/cards/aliases.conf
(or equivalent path depending on your distro) should suffice:

	AppleOnbdAudio cards.PMacToonie

> > > 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 ?
> 
> 1.0.10-4ubuntu4

Could you try alsa-lib 1.0.12?  Then you'll have more bonus, not only
the fixes for this softvol problem ;)


Takashi
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