[alsa-devel] ALSA Multichannel through HDMI

John Ettedgui john.ettedgui at gmail.com
Thu Nov 25 13:21:39 CET 2010

On Thu, Nov 25, 2010 at 3:40 AM, Anssi Hannula <anssi.hannula at iki.fi> wrote:
> On 25.11.2010 13:09, John Ettedgui wrote:
>> On Thu, Nov 25, 2010 at 2:49 AM, Anssi Hannula <anssi.hannula at iki.fi> wrote:
>>> On 25.11.2010 06:12, John Ettedgui wrote:
>>>> I'm actually trying to get a 5.1 setup working without passthrough, if
>>>> I use mplayer with passthrough my receiver behaves just fine, but I am
>>>> trying to send the 6 channels from the computer.
>>>> I was actually told that the current ALSA driver for radeon's hdmi
>>>> does not support more than 2 channels, and that would explain why I'm
>>>> getting this behavior. Is that true though?
>>> Yes.
>>> However, strangely your log output seems to show the intel's hdmi parser
>>> being used instead:
>>>> ALSA sound/pci/hda/patch_intelhdmi.c:842: hdmi_setup_stream: NID=0x2,
>>>> stream=0x1, new-format=0x11
>>> Were you just trying some patch at the time?
>> yes Wu gave me a patch to try against the kernel, I'm guessing this is
>> the reason you see something unexpected.
> Did 6 channels work with that patch? (possibly with a wrong channel order)
Not any better as far as I remember.
> Also, could you provide the patch?
> (so that I won't ask you or anyone else to test unnecessary stuff :) )
I attached it to this email.
> I wasn't able to locate the original thread in archives.
>> Since I just moved to jack/rca cables I'm in no hurry anymore, but is
>> there any reason why the driver cannot work with more than 2 channels?
> I don't really know (it is simply not implemented).
>> Anything I could do to help with that?
> Possibly. But see above, so that we won't try the same things you
> already tried :)
Sure :)
> --
> Anssi Hannula
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