I just found the same error message in my Xorg.0.log. It only occures on my notebook with an Intel GMA 950 graphic chipset. It never happened with 9.04, it started with 9.10.
At first the error seemed to occur randomly, but the last two times it happened when I was copying text with Ctrl-c. Right after pressing the keys, the log-off occurred. Xorg.0.log ends with these lines: Backtrace: 0: /usr/bin/X(xorg_backtrace+0x3b) [0x8133d6b] 1: /usr/bin/X(xf86SigHandler+0x55) [0x80c7d35] 2: [0xaf3400] 3: /usr/bin/X(xf86AccResFromOS+0x45) [0x80b8c55] 4: /usr/bin/X(xf86ResourceBrokerInit+0x2f) [0x80be7bf] 5: /usr/bin/X(InitOutput+0x19a) [0x80b026a] 6: /usr/bin/X(main+0x1cb) [0x807234b] 7: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0x249b56] 8: /usr/bin/X [0x80719c1] Saw signal 11. Server aborting. ddxSigGiveUp: Closing log A similar bug seems to be this: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/511095 -- X server crashes with "Saw signal 11. Server aborting" https://bugs.launchpad.net/bugs/506069 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-180 in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp