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Lenovo bought the IBM pc division about 10 years ago. I'm on a Lenovo thinkpad which was the original IBM notebook. I get the same error but brightness control seems to work fine. I'm new to Linux myself, but I do believe that the generic acpi functions work fine. What needs to happen is the drivers need to be written to recognize the acpi hardware that ...


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The duplicate answer provides two solutions: reduce Screen brightness in battery mode automatically But for me in this case the solution was somewhat simpler: I just set the brightness to 50% on each system start in the startup programs (gnome-session-properties) with the command: xbacklight -set 50% Info: It doesn't work to call xbacklight in ...


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install indicator-brightness 'bar for brightness control' $ sudo add-apt-repository ppa:indicator-brightness/ppa $ sudo apt-get update $ sudo apt-get install indicator-brightness or make it start on boot install $ sudo apt-get install xbacklight open the 'Startup Applications' then and add a 'new startup item' with the command: xbacklight -set ...



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