Happened to me twice recently, both times while being away from the system.
I don't recall the first time precisely, but today the machine wasn't doing much of anything. The only apps running were Firefox (some seemingly innocent pages), Thunderbird, two terminals, emacs, and maybe pidgin. I had the system in 'lock screen'-mode (display turned off), with the 'Skyrocket'-screensaver running. When I returned and turned the display back on, I was at the gdm login prompt. All my manual mounts were still mounted, so gdm had just cycled, I concluded. Indeed, in syslog: gdm[10640]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0 Ubuntu 8.04 Hardy Heron. $> uname -a Linux skyscraper 2.6.24-23-generic #1 SMP Mon Jan 26 01:04:16 UTC 2009 x86_64 GNU/Linux $> lspci -vvnn see attachment dmesg: I'm not even thinking about attaching that, for it's entirely meaningless -- apart from the above gdm error. Reason: it's flooded, every 2 seconds(!), with this message: DoRxHighPower(): RF_ZEBRA, Upper Threshold: 99 LOWER Threshold: 70 That's a bug in its own right, one which apparently will not be fixed. Nice going. bjd ** Attachment added: "lspci -vvnn" http://launchpadlibrarian.net/22923285/lspci-vvnn -- After security update ubuntu restarts https://bugs.launchpad.net/bugs/128207 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs