How to adjust brightness in Fedora 17 on Sony viao

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http://unix.stackexchange.com – I have a Sony E Series laptop with Fedora 17 and Windows 8 in dual boot. The brightness adjusts just fine on my Windows8 but not in Fedora. If I change it with the brightness slider in the power settings nothing happens. The brightness stays maximum even if I adjust the slider to minimum. Blinded by my screen and frustrated by the draining battery I tried everything on the net. I tried things like - Reinstall bash. yum reinstall bash Add this to kernel parameters in grub2.cfg - acpi_backlight=vendor Add this line to xorg.conf - Option "RegistryDwords" "EnableBrightnessControl=1" Add this (HowTos)