Does 
do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.
show up on STDERR when the problem occurs (the background changes) or before?

The warning comes from mesa, in
http://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/drivers/dri/common/vblank.c
(in do_wait() around line 260). drmWaitVBlank() is in
http://cgit.freedesktop.org/mesa/drm/tree/libdrm/xf86drm.c .

** Also affects: mesa (Ubuntu)
   Importance: Undecided
       Status: New

** Bug watch added: freedesktop.org Bugzilla #8722
   https://bugs.freedesktop.org/show_bug.cgi?id=8722

-- 
Opengl is unstable with cairo-dock drmWaitVBlank returned -1
https://bugs.launchpad.net/bugs/428900
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which is subscribed to mesa in ubuntu.

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