linux-kernel - Re: Radeon HDMI audio in 2.6.33 kernel ???

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Date:	Wed, 27 Jan 2010 22:54:45 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	<debian@...cot.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: Radeon HDMI audio in 2.6.33 kernel ???

At Wed, 27 Jan 2010 11:17:04 +0100,
<debian@...cot.org> wrote:
> 
> 
> Hello,
> 
> I'm not sure I'm at the right place (please, if not, tell me where I can
> find a solution...) but I have a problem with multimedia hardware.
> So, I've changed my graphic card and I've bought an ATI Radeon HD 4550. My
> goal is to use only an HDMI cable between my computer and my AV amplifier.
> I've installed Debian Sid but I can't have any sound... Everything seems
> OK with Alsa (and PulseAudio), but no sound !!!

How did you test it?

> With google, I've found this :
> http://www.phoronix.com/scan.php?page=news_item&px=NzgxMA
> [I should need a 2.6.33 kernel to have HDMI support with ATI cards]
> So, I've compiled the 2.6.33RC5 kernel, but no difference !!!
> 
> The card seems to be OK :
> # aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> 
> Do you have any idea ?

If the audio codec is detected, a possible problem is the video driver
side.  The HDMI is handled rather in the video chip, and it has
usually a register switch to enable/disable HDMI audio.  Similarly,
the EDID handling can break the audio handling, too.

If it's really a problem of the audio codec, you can try to move the
corresponding codec id from patch_atihdmi.c to patch_intelhdmi.c.
(don't forget MODULE_ALIAS() there, too).

Takashi
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