Comment 2 for bug 551668

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Steve Langasek (vorlon) wrote : Re: Fn+F5 and Fn+F6 don't modify brightness on Sony VAIO VPCCW

acpi-support is not involved in brightness hotkeys on the Vaios; and as you say the OSD works, it's clearly not a problem with registration of the hotkey anyway. This is a problem with the backlight control, which I believe is primarily handled by the X server; reassigning.