I also see this bug on an Ubuntu 12.04 64-bit machine with ATI Radeon HD 4350.
$ lspci | grep VGA 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4300 Series] $ uname -a Linux hostname 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ dpkg -l | grep unity-greeter ii unity-greeter 0.2.8-0ubuntu1.1 Unity Greeter -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/931967 Title: Corrupted graphics after the login until the unity launcher appears To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/931967/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs