I am also having this problem (on karmic) . Xorg log says:
Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8133d6b]
1: /usr/bin/X(xf86SigHandler+0x55) [0x80c7d35]
2: [0xa5a400]
Saw signal 11. Server aborting.
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) AT Translated Set 2 keyboard: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
(II) Logitech USB-PS/2 Optical Mouse: Close
(II) UnloadModule: "evdev"
ddxSigGiveUp: Closing log
on the syslog I find:
Nov 27 11:20:53 mogul acpid: client 1559[0:0] has disconnected
Nov 27 11:20:53 mogul acpid: client 1559[0:0] has disconnected
Nov 27 11:20:53 mogul acpid: client connected from 22729[0:0]
Nov 27 11:20:54 mogul acpid: client connected from 22729[0:0]
Nov 27 11:24:54 mogul acpid: client 22729[0:0] has disconnected
Nov 27 11:24:54 mogul acpid: client 22729[0:0] has disconnected
Nov 27 11:24:54 mogul acpid: client connected from 22729[0:0]
Nov 27 11:24:54 mogul acpid: client connected from 22729[0:0]
my video card:
01:00.0 VGA compatible controller: nVidia Corporation NV44 [Quadro NVS 285]
(rev a1)
ii nvidia-glx-185 185.18.36-0ubuntu9
NVIDIA binary Xorg driver
When this happens, X crashes and then I am presented the login screen
again...
--
gdm[17077]: WARNING: gdm_slave_xioerror_handler : Fatal X error
https://bugs.launchpad.net/bugs/412113
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