[alsa-devel] 3.7 HDMI channel map regression

Takashi Iwai tiwai at suse.de
Mon Jan 28 09:56:33 CET 2013

At Sun, 27 Jan 2013 19:18:27 -0600,
Shawn Bohrer wrote:
> Hi Takashi,
> I recently updated my HTPC from 3.6.11 to 3.7.2 and this caused my RL
> and FC channels to swap, and my RR and LFE channels to swap for PCM
> audio.  Doing a git bisect identified
> d45e6889ee69456a4d5b1bbb32252f460cd48fa9 "ALSA: hda - Provide the
> proper channel mapping for generic HDMI driver" as the commit that
> caused my channels to swap.  The commit doesn't revert cleanly on
> 3.7.4, and I haven't really looked to see what the correct fix might
> be.
> Some info that may be relevant, the sound card is a:
> 00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset
> Family High Definition Audio Controller (rev 04)
> The machine is running Fedora 18 and audio goes over HDMI to a 5.1
> receiver.  I'm not really sure what other info you might need, but
> let me know if you need something else or have any patches you would
> like me to test.

OK, it's the first time to get a bug report about this.
Could you tell me how did you test it (i.e. which application, which
sound backend)?  Can you confirm that it's reproduced via speaker-test
program in alsa-utils package?

For further debugging, please give the following:
- alsa-info.sh output while playing 5.1 sound
- /proc/asound/card*/eld* contents while playing 5.1 sound

Also, try to update alsa-lib and alsa-utils from alsa-project.org git
tree, and build alsa-lib/test/chmap program.
	% cd alsa-lib/test
	% make chmap

and run like

	./chmap -Dhdmi:1 query

(-Dhdmi:1 might be different depending on the system setup)



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