I am using Fedora 13 and whenever I Restart or Logoff on my laptop. The screen brightness resets to its maximum value. I am not aware of this problem. Can anyone tell me why this is causing and what is the solution for keeping it's to a constant value at all time?
You might want to check out the following bugs for possible explanations:
It seems that your problem is likely being caused either by gdm or by a bug in gnome-power-manager. If it's the former, then the last bug above points to a discussion that contains a possible solution (see the post by swmail), however, I don't know if it will work in your case (let us know what happens, and we'll work from there ...).
If it's gnome-power-manager causing the problem, it seems that the bug still hasn't been fixed.
The solution is to use the following command at startup:
Probably you can have a look at this link, which provides a workaround till you get a fix from distribution.