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I have a Toshiba Satellite A105-4244 (Intel Chipset+Integrated Graphics) and I can't adjust the brightness. Neither the buttons nor the system settings/brightness and lock work.

Also I tried the grub suggestions acpi_backlight and it didn't solve anything.

EDIT: Ubuntu 12.04

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Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

xgamma -gamma 0.5

Or

xgamma -gamma 0.6

similarly

xgamma -gamma 0.4
  • Thanks but it won't do. This changes gamma not monitor brightness. – Adrian Gabura Sep 9 '12 at 7:42

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