I notice you're getting this backtrace in your log:
Backtrace:
0: /usr/X11R6/bin/Xorg(xf86SigHandler+0x81) [0x80c3c71]
1: [0xffffe420]
2: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_free+0x1d) [0xb57c2d7d]
3: /usr/lib/xorg/modules/extensions//libGLcore.so(XMesaDestroyVisual+0x1d)
[0xb59547dd]
4: /usr/lib/xorg/modules/extensions//libGLcore.so [0xb590b74f]
5: /usr/lib/xorg/modules/extensions//libglx.so(__glXResetScreens+0x37)
[0xb7c90677]
6: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c8f81c]
7: /usr/X11R6/bin/Xorg(CloseDownExtensions+0x46) [0x809c636]
8: /usr/X11R6/bin/Xorg(main+0x4af) [0x8076eff]
9: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7dd2050]
10: /usr/X11R6/bin/Xorg(FontFileCompleteXLFD+0x1e9) [0x8076221]
Fatal server error:
Caught signal 11. Server aborting
I also notice you're running a non-stock xserver:
xorg-server 2:1.3.0.0.dfsg-12ubuntu1-jbs1
I don't know what's in jbs1, but we're up to -12ubuntu8, which contains
fixes for a variety of mesa/GL problems. Also, we've today released a
new -ati driver, version 1:6.7.194-1ubuntu2.
Can you please install and test with these newer versions? If it still
locks up, could you also attach the output from lspci -vvnn?
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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Xorg crash with xrandr1.2 and dual screens with compiz
https://bugs.launchpad.net/bugs/149653
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