I am having the same problem on an IBM ThinkPad T60 running up to date Lucid. Here is the lspci output for the video card:
01:00.0 VGA compatible controller: ATI Technologies Inc M52 [Mobility Radeon X1300] When i added radeon.modeset=0 with the kernel options, the problem appears to have gone away, and has stayed away for about 12hrs. -- [RV515] [LENOVO T60] external screen display shows "shivering", horizontal refresh offset https://bugs.launchpad.net/bugs/541501 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
