[Nouveau] [Bug 32406] nouveau fails to send hotplug event to ALSA hda hdmi audio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32406

--- Comment #6 from James <buzzbuzz22 at hotmail.com> 2010-12-18 09:23:23 PST ---
I have found the problem.
nouveau tries to send the eld info in
nv50_audio_mode_set()

Unfortunately, this is sent before the audio driver is loaded.
It is then resent later.
If the ALSA audio driver is forced to try and read the eld data 3 times instead
of just once, the eld data finally reaches the ALSA audio driver, and sound
then works.
So, I now have a valid work around.
Some further investigation is needed to discover why the sending of eld data is
so unreliable, requiring it to be sent multiple times.
Maybe some co-ordination between the nouveau driver and ALSA is required to
ensure good delivery of the eld data, so that it is valid before setting the
eld_valid GPIO.

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