This seems to be happening to me of late. Symptoms as previous poster.
Get a seg fault in /var/log/Xorg.0.log.old
Backtrace:
[ 7808.923] 0: /usr/bin/X (xorg_backtrace+0x28) [0x45c5a8]
[ 7808.924] 1: /usr/bin/X (0x400000+0x5a87d) [0x45a87d]
[ 7808.924] 2: /lib/libpthread.so.0 (0x7f9f6a38a000+0xfb40) [0x7f9f6a399b40]
[ 7808.924] 3: /usr/lib/xorg/extra-modules/nvidia_drv.so
(0x7f9f64d02000+0x3a3a7c) [0x7f9f650a5a7c]
[ 7808.924] 4: /usr/bin/X (FreeClientResources+0xef) [0x44adef]
[ 7808.924] 5: /usr/bin/X (CloseDownClient+0x5c) [0x43b2ac]
[ 7808.924] 6: /usr/bin/X (0x400000+0x3fa46) [0x43fa46]
[ 7808.924] 7: /usr/bin/X (0x400000+0x2187b) [0x42187b]
[ 7808.924] 8: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7f9f692f5d8e]
[ 7808.924] 9: /usr/bin/X (0x400000+0x21409) [0x421409]
[ 7808.924] Segmentation fault at address (nil)
[ 7808.924]
Caught signal 11 (Segmentation fault). Server aborting
[ 7808.933]
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 7808.933] Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[ 7808.933]
[ 7809.000] (II) Power Button: Close
[ 7809.000] (II) UnloadModule: "evdev"
[ 7809.080] (II) Power Button: Close
[ 7809.080] (II) UnloadModule: "evdev"
[ 7809.151] (II) Logitech USB Laser Mouse: Close
[ 7809.151] (II) UnloadModule: "evdev"
[ 7809.200] (II) Apple, Inc Apple Keyboard: Close
[ 7809.200] (II) UnloadModule: "evdev"
[ 7809.260] (II) Apple, Inc Apple Keyboard: Close
[ 7809.260] (II) UnloadModule: "evdev"
[ 7809.340] (II) zc3xx: Close
[ 7809.340] (II) UnloadModule: "evdev"
[ 7809.723] ddxSigGiveUp: Closing log
--
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/740785
Title:
Caught signal 11 (Segmentation fault). Server aborting
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