[Bug 75729] [hsw dp audio] Muting S/PDIF turns off DP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75729

--- Comment #4 from Daniel Martin <consume.noise at gmail.com> ---
(In reply to comment #3)
> Hi Martin/Jani,
> 
> Sorry for the late reply. 

No problem, as stated it's not a showstopper for me. (And I'm even worse with
replies.)

> I don't think this is an audio driver issue, because audio driver operations
> does not directly cause screen on/off. Screen on/off is controlled by Gfx
> driver.
> 
> For Haswell, the display audio devices (controller + codec) share the same
> power well with display. So the audio verb excution, such as muting/unmuting
> S/PDIF can wake up the audio devices and the audio driver will request power
> from Graphic driver. When audio devcies are idle (in D3), the audio driver
> will notify gfx driver it does not need the power. That's all. And even if
> the gfx driver keeps the power well always on, it can still turn on/off the
> screen.
> 
> It seems to me that some user space module binds ALSA S/PDIF mute control
> with screen on/off. 

What do you mean by "user space module", some ALSA module configured with
alsa.conf and friends? The only ALSA configuration I set is to choose the card
with S/PDIF as default. I'll remove it for testing and may temporarily remove
system provided ALSA configurations as well.
Everything else is as bare as a fresh Archlinux installs it, using slim for
login and spectrwm as WM. So, no fency hidden stuff should happen.

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