Comment 2 for bug 555709

Same behavior here on T42 with ATI Radeon Mobility 7500 and Kubuntu Lucid beta. The display is bright up to the kdm logon. When KDE loads, screen brightness drops to lowest at once.

I am not completely sure if it's the same problem as above, since whole brightness management by powerdevil seems to be broken. I.e. when in battery mode, the screen dims down to lowest after reaching the defined idle timeout. It doesn't come back on when moving the mouse or pressing a key, I have to use the FN-Keys (at least they work, though). When hovering the battery indicator applet, the brightness slider is down to lowest even when the screen is bright. Moving it has no instant effect like it had in Karmic. Changing the profiles doesn't help, too.

From searching for an appropriate bug here I think that it might habe something to do with the dropping of HAL and the open source radeon drivers. I'm using an non-modified X setup from a stable Karmic install and dist-upgraded to Lucid beta. It worked good in Karmic btw.

Please let me know if I can provide some more information.