I just installed Ubuntu 12.10 on a Sony Vaio laptop. The brightness functions keys don't change the brightness. When I try to change the brightness I can see the levels going up and down in the notification bubble but it doesn't actually change the brightness. Is there any way to fix this?

i tried this link but it didn't work.

Moreover i have installed additional amd drivers and i am using xorg drivers


you have to concentrate on top right corner of your Ubuntu main screen, there will be one screen brightness adjustment option u will see.Then go through that option and make your own desired brightness.

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