Solution 1:
According to the questioner, user152037, reinstalling the drivers fixed it:
sudo apt-get install --reinstall xserver-xorg-video-intel xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
According to the questioner, user152037, reinstalling the drivers fixed it:
sudo apt-get install --reinstall xserver-xorg-video-intel xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg