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Brightness control works only in Ubuntu, doesn't in Xubuntu/Lubuntu/Kubuntu/Mint (Toshiba Satellite L30)

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 ...