CCFL (the tubes) dim over time. This is partly why you see the move to LED backlighting. Google CCFL to learn up about this old technology.
I have a Dell Inspiron 1420. Few weeks ago I found out that my laptop's maximum brightness was diminishing.
The Fn plus up key is not helping. The maximum brightness my laptop now attains is not what it used to be (Its now quite dim).
I have tried changing power settings to "high performance" but still no use.
Is this an issue with some settings or is it a hardware problem? I have my dell warranty.
Looking for helpful suggestions.