Sony Vaio FW490J Brightness

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http://forums.fedoraforum.org – How can I configure fedora 12 to change the back light brightness? There is nothing in /sys/class/backlight (saw this directory in another forum). I have never used this functionality before because the first boot of this laptop was an XP cd (vista is terribly slow). Eventually the fedora 12 dvd followed. I know that nobody has written a driver for XP x64 so I was hoping that fedora 12 could do it. I am hesitant to try ubuntu guides because I don't want to reinstall fedora 12 again. It takes me more than an hour to do so. Most of this is waiting time because I have to wait for the laptop to cool down first otherwise it tells me the fedora dvd is corrupted. (HowTos)