linux-kernel - Re: [alsa-devel] No mixers on ATI RS780 Azalia

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Date:	Mon, 7 Jun 2010 11:03:56 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Clemens Ladisch <clemens@...isch.de>, Takashi Iwai <tiwai@...e.de>,
	Dave Airlie <airlied@...hat.com>, alsa-devel@...a-project.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [alsa-devel] No mixers on ATI RS780 Azalia

On Mon, Jun 7, 2010 at 8:49 AM, Jan Engelhardt <jengelh@...ozas.de> wrote:
> On Thursday 2010-05-27 14:34, Clemens Ladisch wrote:
>>Clemens Ladisch wrote:
>>> Please do not assume that the "HDMI" device is the right one, since you
>>> never got either one to work in Linux.
>>
>>Hmm, that computer is separate from the actual LCD, which has an HDMI
>>input, so it's possible that the HDMI output would be correct.
>>
>>In that case, it's likely that you've run into this bug:
>>https://bugs.freedesktop.org/show_bug.cgi?id=28030
>>
>>You might try the patch mentioned there, or radeonhd, or fglrx.
>
> Cc'ing drm.
>
> I conclude further tests.
>
> * Linux 2.6.35-rc2
> - fbcon:radeondrmfb using "modprobe radeon modeset=1"
>  - sound ok
> - Xorg (7.4) with 'radeonhd'
>  - fbcon ok, no sound in Xorg - I figure radeonhd is obsolete
> - Xorg with 'radeon'
>  - fbcon ok, xorg ok.
>    There is a small breakdown when switching between fbcon and xorg
>
> * Linux 2.6.33.5
> - like 2.6.35-rc2, but had a bug that prevented radeon.ko to go into
>  graphics mode when initially loaded; workaround: modprobe fglrx;
>  rmmod fglrx; modprobe radeon modeset=1
> - or fglrx, also makes sound work
>
> - fglrx bug aside: switching from Xorg to console (either 80x25 or
>  radeondrmfb) makes a fugly "pop" noise, and if the target is
>  radeomdrmfb, display is garbled.
>
>
> So I'm happy.
> Conclusive questions however:
>
> * Why is it that I am only allowed to have sound in graphics mode?

HDMI audio is only enabled on active outputs during modeset.

>
> * The radeon.ko module does not have any PCI IDs defined, thus does not
> get autoloaded like i915.ko. Is this intentional? It also seems
> to default to modeset=0.

What kernel are you using?  It definitely has pci ids and autoloads just fine.

Alex
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