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I am using lenovo E46A in window i was able to change screen brightness with the control (Fn) but now in ubuntu I can't change it the cursor shows but brightness doesn't change a bit ....So someone please help me .

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This worked for me:

sudo apt-get install acpi
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Go to system settings and click on screen.

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Doesn't work this way..Don't know why ! ! – pcsapkota Oct 19 '11 at 3:35

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