A further note. This might be the same as Ubuntu bug 1167114. Note: I have two graphics controllers: lspci | grep VGA 01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS780L [Radeon HD 3000] 02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV730XT [Radeon HD 4670] There does not seem to be any other kernels in testing that I can try. -- Barry Fishman