[alsa-devel] [PATCH v3 0/5] ALSA: hda - hdmi: ATI/AMD multi-channel and HBR support

Anssi Hannula anssi.hannula at iki.fi
Mon Nov 25 15:56:55 CET 2013

25.11.2013 16:32, James Le Cuirot kirjoitti:
> On Mon, 25 Nov 2013 15:20:23 +0200
> Anssi Hannula <anssi.hannula at iki.fi> wrote:
>> 24.11.2013 16:57, James Le Cuirot kirjoitti:
>>> On Sat, 23 Nov 2013 17:45:00 +0200
>>> Anssi Hannula <anssi.hannula at iki.fi> wrote:
>>>> 23.11.2013 17:40, James Le Cuirot kirjoitti:
>>>>> On Sat, 23 Nov 2013 03:29:28 +0200
>>>>> Anssi Hannula <anssi.hannula at iki.fi> wrote:
>>>>>> 23.11.2013 03:05, James Le Cuirot kirjoitti:
>>>>>>> Anssi Hannula <anssi.hannula <at> iki.fi> writes:
>>>>>>>> Here's another revision of the ATI/AMD multichannel+HBR
>>>>>>>> patchset.
>>>>>>> Hi Anssi. Many thanks for your work on this. I am very keen to
>>>>>>> test this new code but have so far been unsuccessful. I have a
>>>>>>> Radeon 4670 (Sapphire branded) connected to a Yamaha RX-V773. I
>>>>>>> am running the sound/for-next kernel (82755ab) with your
>>>>>>> "missing PCM SAD" patch applied.
>>>>>>> The new kernel has allowed ALSA to recognise the card as
>>>>>>> multichannel and I can issue the following speaker-test command
>>>>>>> but I still only hear "Front Left" and "Front Right" and the
>>>>>>> Yahama seems to report the signal as stereo.
>>>>>>> # speaker-test -Dhdmi:CARD=HDMI,DEV=0 -c6 -t wav
>>>>>> ELD stuff is not necessary for playback, it is mostly for
>>>>>> information (and providing the necessary info for ELD is disabled
>>>>>> on radeon DRI drivers on some kernels on some GPUs ATM due to
>>>>>> some issues).
>>>>>> Is there anything interesting in "dmesg"?
>>>>> I have attached my dmesg. I enabled ALSA debug and verbose printk
>>>>> but disabled the on-board HDA audio in the BIOS to make it less
>>>>> confusing, and also to see if it made any difference, which it
>>>>> didn't. The only entry I find noteworthy is about the ELD but you
>>>>> say this isn't required.
>>> https://gist.github.com/chewi/7628058
>> Unfortunately everything looks OK.
> I had a horrible feeling you'd say that.
>> Do you have any custom configuration in /etc/asound.conf or
>> ~/.asoundrc?
> Just the usual PulseAudio overrides. I don't like PA starting
> automatically so I have that disabled and run speaker-test without it.
> I think the -D option bypasses it anyway. I have also run speaker-test
> through PA just to see and get the same result.


>> To narrow it down a bit, are you able to test any of the following:
>> - same card on Windows,
>> - same card on fglrx,
>> - same receiver with a different AMD card,
>> - same receiver with an Intel/NVIDIA card?
> I banished real Windows installs from my main desktop after a nasty
> incident some years ago. ;) I might be able to dedicate the card to a
> QEMU instance but I've never tried that before.
> I could easily try fglrx but I thought it didn't support multichannel?
> Or this new ALSA code fixes that too?

Yes, it was only the ALSA code that was missing for multichannel, it
works with fglrx as well. With fglrx you should also see the ELD info as
it is not disabled there.

> Unfortunately I don't have any other AMD cards handy. I could try my
> wife's Ivy Bridge based laptop though.
> I'll report back soon.

Anssi Hannula

More information about the Alsa-devel mailing list