[Bug 110879] [CI][SHARDS] igt at kms_chamelium@dp-audio - fail - Timeout on waiting for condition IsAudioInputStable == True

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110879

--- Comment #13 from emersion <contact at emersion.fr> ---
(In reply to emersion from comment #11)
> (In reply to emersion from comment #10)
> > Okay, I've been investigating issues with re-icl-u and it turns out that:
> > 
> > * Audio via the regular DisplayPort connector works
> > * Audio via the mini-DP connector doesn't work
> > 
> > So this is a driver bug after all!
> 
> Errr, maybe not. Tried again with Jani and hw:0,3 plays sound on a real
> monitor.
> 
> I've also tried manually capturing audio with the Chamelium via mini-DP and
> it works. However running the test doesn't (using the same audio device and
> audio parameters).
> 
> Another data point is that running the test works on DP but not on mini-DP.

Okay, new update that I think explains why it sometimes worked and sometimes
didn't:

When starting playing audio and then connecting the monitor, I don't hear any
sounds from a real monitor. When first connecting the real monitor and then
playing audio, I hear it.

The IGT test first starts playing audio then connects the monitor.

* * *

Summary: I believe this is a real driver issue. I don't know whether this is a
bug in the audio stack or in i915.

User impact: mini-DP audio doesn't work if the user started playing audio
before connecting an external monitor.

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