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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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which version of OS? – VendettaDroid Sep 8 '12 at 20:58

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

xgamma -gamma 0.5


xgamma -gamma 0.6


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

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