keyboard backlight

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http://forums.fedoraforum.org – hi, im on fedora 18 64 bit, using a satellite p850 laptop. any idea how to get a backlit keyboard working? it worked for a couple of days after i booted a live iso of fedora 19. the boot hung and i had to hard reboot after which it started working. after installing a windows 8 drive, booting and going back to my fedora drive my backlight no longer works. any ideas what is happening? (HowTos)