Same problem on Kubuntu 12.10 with "VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV620 [Mobility Radeon HD 3400 Series]" on Lenovo T400.
Same problem on Kubuntu 12.10 with "VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV620 [Mobility Radeon HD 3400 Series]" on Lenovo T400.