I have what I think is the same bug, on a Lenovo X301 with an Intel
graphics controller. xrandr changes tend to crash about half to two
thirds of the time.

Backtrace from Xorg.log when the crash happens:
Backtrace:
0: /usr/bin/X(xf86SigHandler+0x65) [0x480f35]
1: /lib/libc.so.6 [0x7fbaf5669060]
2: /usr/lib/xorg/modules/extensions//libglx.so(__glXDeassociateContext+0x35) 
[0x7fbaf4b44375]
3: /usr/lib/xorg/modules/extensions//libglx.so(__glXContextDestroy+0xf) 
[0x7fbaf4b406ef]
4: /usr/lib/xorg/modules/extensions//libglx.so [0x7fbaf4b4c902]
5: /usr/lib/xorg/modules/extensions//libglx.so(__glXFreeContext+0x6c) 
[0x7fbaf4b428ac]
6: /usr/lib/xorg/modules/extensions//libglx.so [0x7fbaf4b428f3]
7: /usr/bin/X(FreeResourceByType+0x105) [0x435505]
8: /usr/lib/xorg/modules/extensions//libglx.so [0x7fbaf4b3f1fe]
9: /usr/lib/xorg/modules/extensions//libglx.so [0x7fbaf4b42bd2]
10: /usr/bin/X(Dispatch+0x364) [0x44d6e4]
11: /usr/bin/X(main+0x45d) [0x4336fd]
12: /lib/libc.so.6(__libc_start_main+0xe6) [0x7fbaf5654466]
13: /usr/bin/X [0x432ad9]
Saw signal 11.  Server aborting.

The common culprit seems to be libglx.so, but this is part of xserver-
xorg-core, so why is this bug filed against mesa?

-- 
crash of Xorg using xrandr
https://bugs.launchpad.net/bugs/273505
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