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I have a Toshiba Satellite laptop with an AMD 64-bit/Radeon HD video card, running Ubuntu 12.10. I can't adjust the brightness from the default maximum, neither the Fn keys nor the system settings slider change anything. I've tried changing the default commands in grub, using GRUB_CMDLINE_LINUX="quiet splash acpi_backlight=vendor, reinstalling bash and directly changing the backlight value in /sys/class/backlight, but none of it works.

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Try installing your display drivers: askubuntu.com/questions/247145/… –  user142877 Mar 24 '13 at 6:23

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