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 Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/762918 Title: Natty Screensaver freezes system after some period of inactivity Status in Linux ACPI client: New Status in X.org xf86-video-intel: Confirmed Status in “gnome-screensaver” package in Ubuntu: Incomplete Status in “linux” package in Ubuntu: Incomplete Bug description: Binary package hint: gnome-screensaver When selecting "Floating Ubuntu" screensaver, after a period of inactivity greater than 40min, the systems locks itself and becomes unresponsive. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: gnome-screensaver 2.30.2-0ubuntu2 ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2 Uname: Linux 2.6.38-8-generic x86_64 Architecture: amd64 Date: Sat Apr 16 13:04:12 2011 EcryptfsInUse: Yes GconfGnomeSession: idle_delay = 5 /desktop/gnome/session/required_components: windowmanager = gnome-wm GnomeSessionIdleInhibited: No GnomeSessionInhibitors: None InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007) ProcEnviron: LANGUAGE=en_US:en LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-screensaver UpgradeStatus: Upgraded to natty on 2011-04-15 (1 days ago) WindowManager: gnome-wm To manage notifications about this bug go to: https://bugs.launchpad.net/acpi/+bug/762918/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
