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Brightness Control Lost at Login Screen


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I'm running 10.4.8 on my Lenovo X60 Tablet PC. Works like a charm, except for wireless, the tablet and sleep, but those are other issues.


What I have here is kinda strange in my opinion. The brightness controls seem to be fully hardware. When at the BIOS screen, or the boot menu, actually any time, the brightness of the display can be adjusted.


However, when I boot OS X, when the blue-ish background shows, and just thereafter the login screen, OS X turns the brightness to its fu

lest and from that point on also can't be changed.


When looking at the Display properties in the System Preferences, there is no brightness adjustment possible via that panel.


Any ideas?




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