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

[bugzilla-daemon at freedesktop.org]

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

          Priority: medium
            Bug ID: 71588
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: haswell UXA corruption when unblanking from "xset dpms
                    force off"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: rstrode at redhat.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 89163
  --> https://bugs.freedesktop.org/attachment.cgi?id=89163&action=edit
reg dump

Ryan has a swanky new Haswell workstation and when he runs xset dpms force off
(or unblanks the lock screen in gnome) he sees screen corruption.  The output
looks like a sometimes mangled view into previous screen contents.  When a
fullscreen redraw is forced then it corrects itself. (will attach picture).

we've tried disabling fbc and powersave on the kernel command line and that
doesn't help.

will attach dmesg, vbios, and reg dump.  The latter was done once before
reproducing, once immediately after forcing screen blanked, once a second
later, and once after we'd refreshed the screen.

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