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The file "brightness" is on a pseudo file system used by the kernel. See Why are these directories called file systems? The general location is /sys/class/backlight/ , although the exact location varies by graphics card. Example - /sys/class/backlight/intel_backlight/brightness You can not delete these files. There are many ways to adjust brightness, ...


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I think the problem is in your video card try sudo apt-get install fglrx xvba-va-driver libva-glx1 libva-egl1 vainfo EDIT: Try: sudo apt-get install libcheese* sudo apt-get install xorg-video-abi-15 sudo apt-get install fglrx-updates


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In the terminal: sudo gedit /etc/default/grub Change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" Then, save the file. sudo update-grub Restart computer. The function keys (Fn+F5/F6) should now be active. I found out that the grub file got modified after an upgrade of the system and had to do ...


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xrandr -q | grep " connected" Type that to find out the first block of text it spits out, which is your display. Use that with the next command: xrandr --output VGA1 --brightness 0.7 Go get it back to original brightness: xrandr --output VGA1 --brightness 1


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You can adjust your brightness using the following command: echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness The maximum value is available with: $ cat /sys/class/backlight/acpi_video0/max_brightness 15 You may have to find the right device (here mine was acpi_video0 but you can also have intel_backlight).


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there are two ways to do this: First Method: Try this if you want to change brightness using hotkeys (Fn+F5 and Fn+F6) Open the terminal and type the following command: gksudo gedit /etc/default/grub Enter your password and it will open the file in gedit. You need to find two variables and add their value as below. If the variables are already there ...



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