Fedora 12 on ASUS F8P backlight problem

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http://forums.fedoraforum.org – My laptop is ASUS F8P running Fedora 12. The LCD backlight turn off every several minute. I had turn off every power management options, but still no use. In addition, Ubuntu 9.10 has the same problem. The hardware has no problem, because if It run Vista, the LCD work well. Can anybody help? ---------- Post added at 01:07 PM CST ---------- Previous post was at 01:02 PM CST ---------- Oh! I forget, it use gnome 2.28.0, kernel Indeed, I had installed F12 just after it release, and update every day, but this problem remain unsolved. (HowTos)