Ah. I believe this is the problem, or at least very closely related:
<http://cgit.freedesktop.org/xorg/xserver/tree/fb/fbseg.c#n693>:
if (clip2 != 0 || drawLast)
len++;
in combination with these variables:
new_x1 = 36
new_x2 = 0
new_y1 = 16
new_y2 = 0
clip2 = 10
len = 37
This incremented len to 37, extending (in reverse) the line below (0,
0), which leads to a segmentation fault.
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https://bugs.launchpad.net/bugs/416421
Title:
[gm45] X crash on X200s with dual monitors (using DisplayPort)
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