@Abhijit: as I suspected, your problem is not being caused by the gpu-manager but it's probably a bug in the fglrx driver. You might want to file a separate bug report against the fglrx package.
@Abhijit: as I suspected, your problem is not being caused by the gpu-manager but it's probably a bug in the fglrx driver. You might want to file a separate bug report against the fglrx package.