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[Ian Will <icwill@xxxxxxxxx>]

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

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