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invert
xcalib -i -a
(sudo apt-get install xcalib)
if error:
Error - unsupported ramp size 0
Bug in X windows:
You need to create a xorg .conf file to force usage of intel drivers. Create a file /etc/X11/xorg.conf.d/20-intel.conf and put these lines there:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
EndSection