Open the terminal and follow the steps listed below:
1)sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
2)sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
3)Type the following lines
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
4)Save the file
5)Log out and then login
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https://bugs.launchpad.net/bugs/1502630
Title:
Screen brightness cannot be changed
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