Hi! I have also run into this issue a couple of times now.Although I’m running an lenovo t500, so it is also the radeon driver, but a different card.
output of lspci:01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV635/M86 [Mobility Radeon HD 3650]
I would be glad to help debugging it, just help me to do it! =) cheers, Dieter