This part of the Gdm 1 log is suspicious:
Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e83bb]
1: /usr/bin/X (0x8048000+0x5da8d) [0x80a5a8d]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0xc0840c]
3: /usr/bin/X (0x8048000+0x25d3e) [0x806dd3e]
4: /usr/bin/X (0x8048000+0x1a5ba) [0x80625ba]
5: /lib/li
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/625239
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** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)
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https://bugs.launchpad.net/bugs/625239
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** Attachment added: "BootDmesg.txt"
https://bugs.edge.launchpad.net/bugs/625239/+attachment/1522672/+files/BootDmesg.txt
** Attachment added: "CurrentDmesg.txt"
https://bugs.edge.launchpad.net/bugs/625239/+attachment/1522673/+files/CurrentDmesg.txt
** Attachment added: "DRM.card0.DVI.I.
