I believe this should be solved in current Precise kernel (3.2.0-32.51), after commit:
2d35d73b032ce99701b059023e422a719ed8bab9 "drm/radeon: rework pll selection (v3)" (upstream commit 985f61f7ee647ad570c05eab0b74915da2ac8e19) Could you please try to update your kernel and verify if you still have this issue? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1066595 Title: kernel upgrade breaks triple monitor setup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1066595/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs