Are you sure this is gdm-related? I just experienced the same problem
for the first time today on my Kubuntu 9.10 (hence with kdm instead). On
an HP EliteBook 8530p with a "ATI Technologies Inc Mobility Radeon HD
3650" (fglrx driver).
X crashed and kdm should have restarted (but AFAIK on this hardware the
system then halts completely). The log may show some more stuff at the
end because I tried some SysRq combinations to reboot cleanly (which
failed as well).
[...]
(II) fglrx(0): EDID vendor "AUO", prod id 6523
(II) fglrx(0): Printing DDC gathered Modelines:
(II) fglrx(0): Modeline "1680x1050"x0.0 131.50 1680 1808 1920 2030 1050 1053
1059 1080 -hsync -vsync (64.8 kHz)
Backtrace:
0: /usr/bin/X(xorg_backtrace+0x26) [0x4f00c6]
1: /usr/bin/X(xf86SigHandler+0x41) [0x488281]
2: /lib/libc.so.6 [0x7f858d835530]
3: /usr/bin/X(FindGlyphRef+0x2c) [0x5275ec]
4: /usr/bin/X(FindGlyphByHash+0x28) [0x527c58]
5: /usr/bin/X [0x533f49]
6: /usr/bin/X(Dispatch+0x394) [0x44e174]
7: /usr/bin/X(main+0x3b5) [0x434085]
8: /lib/libc.so.6(__libc_start_main+0xfd) [0x7f858d820abd]
9: /usr/bin/X [0x433509]
Saw signal 11. Server aborting.
(II) AT Translated Set 2 keyboard: Close
(II) UnloadModule: "evdev"
(II) Video Bus: Close
(II) UnloadModule: "evdev"
(II) CKA7216: Close
(II) UnloadModule: "evdev"
(II) Sleep Button: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
(II) UnloadModule: "synaptics"
(II) Microsoft Compact Optical Mouse 500: Close
(II) UnloadModule: "evdev"
(II) PS/2 Generic Mouse: Close
(II) UnloadModule: "evdev"
(II) AIGLX: Suspending AIGLX clients for VT switch
(II) fglrx(0): Backup framebuffer data.
(II) fglrx(0): Backup complete.
(II) fglrx(0): IRQ 32 Disabled.
ddxSigGiveUp: Closing log
** Attachment added: "xorg.0.log file"
http://launchpadlibrarian.net/39058961/Xorg.0.log.old
--
GDM logs out / disconnects user randomly
https://bugs.launchpad.net/bugs/511095
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