[Bug 71588] haswell UXA corruption when unblanking from "xset dpms force off"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71588

--- Comment #10 from Ray Strode [halfline] <rstrode at redhat.com> ---
it is a version that does partial screen updates, and those updates aren't
visible.  you can scroll the terminal around and it doesn't update, but hitting
the super key makes it go to the overview and fixes the problem.

The only warnings in the Xorg log deal with the Cintiq plugged into it, nothing
from the ddx. 

note it happens on two haswell machines (attachment 89166 is a laptop and
attachment 89167 is a workstation).  All the bits except for attachment 89166
are from the workstation.

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