[alsa-devel] Bug in setting channels, related to recent ELD/EDID changes?

VDR User user.vdr at gmail.com
Thu Dec 23 03:22:53 CET 2010

Hi.  After updating my stable kernel from to, I get
a problem when tuning HDTV channels that use surround sound.  The
error I get is as follows:

audio_alsa_out: Cannot set number of channels to 6 (err=-22:Invalid argument)
audio_out: open failed!

With the following xine error:
---------------------- (ERROR) ----------------------
The audio device is unavailable. Please verify if another program
already uses it.

['Audio device unavailable' '']
------------------ (END OF ERROR) -------------------

This problem did not exist in alsa drivers (using
snd-hda-intel).  I have noticed that there has been recent changes
associated with ELD/EDID that sets limitations on channels.  First of
all I think this is a horrible idea since many devices don't even
contain correct EDID.  It's simply too unreliable to use.  Secondly,
could the above problem be related to those changes?

If anyone knows a fix for this or can point me in the right direction
(aside of going back to, PLEASE fill me in.

Here are some system specs:
debian testing
kernel snd-hda-intel driver used for hdmi audio on nvidia gt240 video card
hdmi going to 7.1 surround sound receiver & setup

Any help is greatly appreciated!

Best regards,

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