[alsa-devel] ALSA Multichannel through HDMI

[John Ettedgui]

On Tue, Jan 12, 2010 at 9:02 PM, Wu Fengguang <fengguang.wu at intel.com> wrote:
> On Wed, Jan 13, 2010 at 12:55:09PM +0800, John Ettedgui wrote:
>> On Tue, Jan 12, 2010 at 8:52 PM, Wu Fengguang <fengguang.wu at intel.com> wrote:
>> > On Wed, Jan 13, 2010 at 12:48:13PM +0800, John Ettedgui wrote:
>> >> On Tue, Jan 12, 2010 at 5:45 PM, Wu Fengguang <fengguang.wu at intel.com> wrote:
>> >> > On Wed, Jan 13, 2010 at 09:32:04AM +0800, John Ettedgui wrote:
>> >> >> On Tue, Jan 12, 2010 at 5:09 PM, Wu Fengguang <fengguang.wu at intel.com> wrote:
>> >> >
>> >> >> >> > You can play a 5.1 track and find something like this in dmesg:
>> >> >> >> >
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >        HDMI: ASP channel %d => slot %d
>> >> >> >> >
>> >> >> >> After trying speaker-test -c6, I could not find anything like that.
>> >> >> >> If I try mplayer -channel 6, it just does not output any sound.
>> >> >> >
>> >> >> > Did you enable CONFIG_SND_DEBUG_VERBOSE?
>> >> >> >
>> >> >>
>> >> >> Yes.
>> >> >
>> >> > Then we need more debugging..
>> >> >
>> >> > Can you send me the file /proc/asound/card*/eld*?
>> >> Attached to this email
>> >> > And the alsainfo output:
>> >> >        http://www.alsa-project.org/alsa-info.sh
>> >> and this one is at
>> >> http://www.alsa-project.org/db/?f=59773f9117f653f3d20d21b90dc2104eeb5d1ecd
>> >
>> > John, please try this and then redo speaker-test and check dmesg:
>> >
>> >        # echo monitor_present 1 > /proc/asound/card*/eld*
>> >
>> > Thanks,
>> > Fengguang
>> >
>> Alright, I guess this is the output we are looking for:
>>
>>
>> ALSA sound/pci/hda/patch_intelhdmi.c:842: hdmi_setup_stream: NID=0x2,
>> stream=0x1, new-format=0x11
>> ALSA sound/pci/hda/hda_intel.c:1641: azx_pcm_prepare: bufsize=0x10000,
>> format=0x11
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>> HDMI: ASP channel 0 => slot 0
>
> Oh well, I guess your hardware doesn't support channel mapping..
>
> You can still do it in user space:
>        http://article.gmane.org/gmane.linux.alsa.user/33393
>
> Thanks,
> Fengguang
>

I am sorry to resurrect this thread after so long, but I still have
not been able to get anywhere.
Also it just came to my attention that if my receiver always sees the
hdmi connection as stereo (apart from when using ac3/dts passthrough)
channel remapping is not the solution, but somehow something else is
messed up.

I think I should try some options in modprobe.conf for snd-hda-intel
but I am not sure which ones, and from all the examples I can find on
the web, it seems none of them are talking about a radeon hdmi
connection...

So I'm asking for advice here again :)

Thanks!