I've got the problem too. Looks like a segfault in gnome-screensaver or libcairo.
1) lsb_release -rd Description: Ubuntu 11.10 Release: 11.10 2) apt-cache policy gnome-screensaver Installed: 3.2.0-0ubuntu1 Candidate: 3.2.0-0ubuntu1 Version table: *** 3.2.0-0ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages 100 /var/lib/dpkg/status 3) When the screen is locked, typically it should resume after mouse movement or keyboard input and provide a log-in prompt. 4) When mouse or keyboard event happen after screen lock, the cursor will move around but the screen is blank. I am able to access a non-X terminal via ctrl-alt-F1, but the X server is hung and must be killed. The output of dmesg | tail is [16621.910506] [<ffffffff8117939a>] do_vfs_ioctl+0x8a/0x340 [16621.910508] [<ffffffff811796e1>] sys_ioctl+0x91/0xa0 [16621.910512] [<ffffffff815f22c2>] system_call_fastpath+0x16/0x1b [16621.910514] ---[ end trace ce3b9456974e9ef8 ]--- [16625.532183] usb 2-5.3.4: USB disconnect, device number 9 [16627.125468] usb 2-5.3.5: reset high speed USB device number 10 using ehci_hcd [16627.309145] usb 2-5.3.7: reset full speed USB device number 11 using ehci_hcd [16627.512684] usb 3-1: reset full speed USB device number 2 using uhci_hcd [16638.426057] gnome-screensav[2108]: segfault at 5 ip 00007f5e47fda859 sp 00007fff7fe06690 error 4 in libcairo.so.2.11000.2[7f5e47fa1000+b9000] [20241.656554] gnome-screensav[8820]: segfault at 5 ip 00007fad73a01859 sp 00007fffd2f02b10 error 4 in libcairo.so.2.11000.2[7fad739c8000+b9000] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/762918 Title: Natty Screensaver freezes system after some period of inactivity To manage notifications about this bug go to: https://bugs.launchpad.net/acpi/+bug/762918/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
