increasing display brightness on vaio laptop fedora 9

increasing display brightness on vaio laptop fedora 9 I have fedora 9 on sony vaio with dual boot. But Fn keys dont work. Is there any other way to adjust brightness ? I have ATI graphics card.
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Guest [Entry]

"You can use xgamma:

xgamma -gamma 2.0

default is 1.0, anything higher will brighten the output from the X server (not the laptop's backlight though) so it shouldn't use more battery."