See a (relatively) short standalone code demonstrating the bug. If the
problem is not seen immediately, try resizing the window a few times.

Notes:

1. The crucial point is the XSetClipMask() call. If you disable it (change 
if(1) to if(0) in the line above that), the problem goes away.
2. This is also specific to rendering to an off-screen buffer; direct drawing 
on win is fine (but Grace uses buffered output).
3. It's the same with the 2.4.1 driver backported 
<https://wiki.ubuntu.com/ReinhardTartler/X/RevertingIntelDriverTo2.4>, so the 
bug must have been there for long, but only now triggered by a change in xorg 
at a higher level.
4. With 2.7.0 compiled from the sources the bug is still there. However, if I 
select "AccelMethod" "UXA" (new in 2.7.0) everything is fine. "AccelMethod" 
"XAA" hard locks my box (a P1610 lifebook) with any version of the driver.


** Attachment added: "Demo for the bug"
   http://launchpadlibrarian.net/26352378/XClip.c

-- 
[i945gme] grace font horkage in jaunty
https://bugs.launchpad.net/bugs/325169
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