[Bug 90179] dpms/blanking does not work with current git on HD 5500

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90179

--- Comment #12 from Lukas Hejtmanek <xhejtman at fi.muni.cz> ---
(In reply to Chris Wilson from comment #11)
> Created attachment 115338 [details] [review]
> Disable CRTC if DPMS fails
> 
> Ok, that looks consistent with the kernel failing to disable the output (and
> not the following SaveScreen(unblank)).
> 
> Can you please test the following patch? Having a debug log (like the last
> with just X + xterm) in any case would be very useful, thanks.

well, this one fail on assertion (sna_crtc->flags & CRTC_ON) in 
__sna_crtc_disable.

I work arounded this. However, I get no screen at all, just turned off display
with error message on console:
sna_output_dpms: failed to set DPM mode [3->0] on output eDP1: 22
sna_output_dpms: failed to set DPM mode [0->3] on output eDP1: 22

I created dmesg with drm.debug=6 as requested, but not sure whether it is
usable right now as I didn't reach xset test.

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