Problem with Fedora 14 on a Laptop

[Eran Arad]

Hello

I wonder if someone encountered this problem:
I have just received a brand new Lenovo T510 Laptop. I have installed,
successfully, a Fedora 14 system. This is a dual-system machine, with Window
7 Professional also installed.

The problem: Staring the machine in Fedora, unplugged to electricity, the
screens dims down to hardly readable level. Trying to increase brightness,
using the function+brightness button has no effect. Plugging to electricity
restores proper brightness.
Another show up of the same problem: started plugged in with proper
brightness, than any touch of function+brightness key brings the screen to
unreadable, and unchangeable brightness. Seem to me that the eFedora 14
scales the potentiometer of screen luminosity incorrectly.

Some information: Working in Windows 7, on the same machine: this does not
happen
                           On previous Lenovo, T60p, with Fedora 12, this
did not happen either.

Has anybody encountered this problem ? any clue how to resolve,

Thanks,
Eran
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