Comment 3 for bug 538256

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Martin Emrich (emme) wrote :

I found a temporary way to control the brightness here: http://bbs.archlinux.org/viewtopic.php?id=73889

To control the brightness, I run

 "sudo setpci -s 00:02.0 F4.B=??"

with ?? ranging from 00 (completely black) to FF (maximum brightness)