[Bug 72375] New: Corruption in some windows after returning from xlock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72375

          Priority: medium
            Bug ID: 72375
          Assignee: chris at chris-wilson.co.uk
           Summary: Corruption in some windows after returning from xlock
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: imirkin at alum.mit.edu
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 90327
  --> https://bugs.freedesktop.org/attachment.cgi?id=90327&action=edit
dockapp with black squares

Hardware: Thinkpad T420s, Sandybridge CPU/graphics. LVDS + HDMI (through DP ->
HDMI dumb adapter); LVDS = 1600x900, HDMI = 1920x1200, configured above LVDS.
Driver: xf86-video-intel-2.99.906, SNA accel
Xorg 1.14.3

[622671.551] (**) intel(0): Framebuffer tiled
[622671.551] (**) intel(0): Pixmaps tiled
[622671.551] (**) intel(0): "Tear free" disabled
[622671.551] (**) intel(0): Forcing per-crtc-pixmaps? no
[622671.552] (II) intel(0): SNA initialized with Sandybridge (gen6, gt2)
backend
[622671.552] (==) intel(0): Backing store disabled
[622671.552] (==) intel(0): Silken mouse enabled
[622671.552] (II) intel(0): HW Cursor enabled

I'm not sure if this is the only time this happens, but after running xlock, a
particular dockapp has black squares in it (see screenshot). This happens every
time, but the precise corruption pattern differs from time to time. Seemingly
only that dockapp is affected, although I've seen it happen elsewhere in the
past (but I would just eventually notice it, whereas here it's 100%
reproducible). I'm using plain windowmaker-0.92, no funny compositor stuff
going on. Dragging a window over the dockapp makes it redraw properly. The
dockapp is wmauda-0.9.

In case it matters, I'm using xlockmore-5.43. The screen is black when it asks
for the password.

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