I'll add I'm not using any non-free drivers, using Xubuntu 10.04. Dimming after suspend not a problem in 10.10 or 11.04 with Xubuntu (or Ubuntu). Graphics:
01:00.0 VGA compatible controller: ATI Technologies Inc M92 [Mobility Radeon HD 4500 Series]
I'll add I'm not using any non-free drivers, using Xubuntu 10.04. Dimming after suspend not a problem in 10.10 or 11.04 with Xubuntu (or Ubuntu). Graphics:
01:00.0 VGA compatible controller: ATI Technologies Inc M92 [Mobility Radeon HD 4500 Series]