[Bug 74861] [hsw] Fast audio playback on Intel Haswell HDMI due to runtime pm

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=74861

Takashi Iwai <tiwai at suse.de> changed:

           What    |Removed                     |Added
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                 CC|                            |tiwai at suse.de

--- Comment #5 from Takashi Iwai <tiwai at suse.de> ---
Optimus is another kind of beast.  Remember that the HDMI audio is always
coupled with graphics.  And when it plays with Nvidia...

In anyway, if the problem gets fixed by disabling the powerwell, it implies
either the powerwell refcounting isn't correct or the audio power domain alone
isn't sufficient for the proper HDMI audio.

Is the problem always seen unless i915.disable_power_well=0 is passed?  For
example, if you replug HDMI and play on your TV (I suppose it's no extra
receiver), does the problem remain?

Then, check whether the audio side is really properly configured.   At least,
/proc/asound/card*/eld#* file should show that the monitor is connected and ELD
is valid.

If it's properly connected, the next thing to check is
/sys/kernel/debug/dri/64/i915/i915_power_domain.  What entries are enabled
there.

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