[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 #4 from Lukas Hejtmanek <xhejtman at fi.muni.cz> ---
(In reply to Lukas Hejtmanek from comment #2)
> (In reply to Chris Wilson from comment #1)
> > Quick test locally doesn't suggest anything wrong. Are you sure this a ddx
> > issue? Is it a regression? If so a quick bisect would be very, very useful.
> 
> the older driver (about march?) worked better. It blanked, turned on,
> blanked again and stood blanked. So, still not perfect but usable. 
> 
> I'll check it and try to provide a bisect.

bisected to this commit:
bc59d3fc76047bcdd20e9750591e06227b9cf39e is the first bad commit
commit bc59d3fc76047bcdd20e9750591e06227b9cf39e
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jan 7 19:44:12 2015 +0000

    sna: Differentiate between disabling CRTC and turning off DPMS

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