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All tested OS were in latest versions (12.04.1 and Mint 13 Mate&XFCE).

Already tried xfce panel aplet for screen brightness, acpi_backlight=vendor argument in GRUB_CMDLINE_LINUX_DEFAULT and replacing xfce-power-manager with gnome-power-manager. Default keyboard shortcut for brightness control should be Fn+F6/F7. Shortcuts for mute, volume up, down and for disable/enable wifi are working properly. For now, I'm able to control brightness only by terminal echo 1 | sudo tee /sys/class/backlight/acpi_video0/brightness.

Just checked Debian Wheezy with Gnome 3 - also works, but I really want to install Xubuntu on this machine.

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Did you try this solution ?… – Suhaib Sep 30 '12 at 15:36
up vote 1 down vote accepted

I had this problem, i unchecked "Power Manager" from "Application Autostart" list in Settings -> Session and Startup and added another application with this command xfce4-power-manager --no-daemon then i have not have this problem yet.

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