Most likely this is a graphic driver issue. Have a look at the following wiki article on X troubleshooting screensaver issues.
https://wiki.ubuntu.com/X/Troubleshooting/Freeze#Problem:%20%20Freezes%20occur%20when%20idle%20and%20screensaver%20is%20set%20to%20random%20settings%20or%20OpenGL ** Package changed: ubuntu => update-manager (Ubuntu) -- computer freezes on screensaver after upgrade to 10.04 https://bugs.launchpad.net/bugs/577308 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
