I have just installed a new LCD screen in a Dell Inspiron 1525. And there is some stuck with my screen If I start on the "lowest" brightness setting, and press the <Fn> + Up Arrow key, the brightness will cycle through all 8 steps to the "highest" brightness setting.
The complexity is that rather than the screen gradually getting brighter, it performs the mechanism from step to step:
Step 1 - dim, Step 2 - slightly brighter, Step 3 - slightly dimmer (same brightness as Step 1), Step 4 - much dimmer, Step 5 - slightly brighter, Step 6 - slightly dimmer, Step 7 - much brighter (this is the brightest setting), Step 8 - Slightly dimmer.
Even at Step 7 (the brightest setting) the screen is only half as bright as it should be. I also tried to use the back-light from the old LCD screen and still getting similar results.
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