Fedora 18 -- cannot undim screen when brightness is set to zero with F2

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http://forums.fedoraforum.org – Hi Fedora Users! I've got a very annoying problem. Although the F2 and F3 function keys work fine in terms of adjusting screen brightness, there is a but. I must always be careful not to decrease brightness to zero with F2 because whenever I do it, I cannot increase it back with F3, the screen remaining almost black. The only remedy is to use the GUI (system settings >> brightness), which as you can imagine is a bit of a roulette and quite a challenge with your desktop practically unreadable :-). What's funny, this problem did not occur when F18 was at the beta stage... It wasn't (HowTos)