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I can't change my brighness via the default ubuntu tool or my FN keys, or even xbacklight. I'm running Ubuntu 12.04 on a laptop with a dual graphics (AMD HD6770M+Intel). I've the drivers set up properly and I can switch between them.

I've tried to adjust the brightness on both the integrated and discrete GPU. Nothing happens.

Any clue how do I go ahead fixing this? I've tried every solution here: Unable to change brightness in a Lenovo laptop

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Use Brightness Controller( It should work.

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press ctrl+t to open the terminal. In the terminal: cat /sys/class/backlight/intel_backlight/brightness will tell you your screen brightness, then you can change it with:

sudo su -c "echo 72 >/sys/class/backlight/intel_backlight/brightness"

Replacing 72 with your desired screen brightness. It will reset when you reboot, but you could just create a text file with the command and run it every time you boot until you find a better solution.

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