"Solution" to Intel Graphics Screen Tearing/Flickering Causes Excessive Fan Use in Ubuntu 16.10/17.04/17.10

The correct solution would be to create the following file:

/etc/X11/xorg.conf.d/20-intel-graphics.conf

having the following content:

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "TripleBuffer" "true"
   Option      "TearFree"     "true"
   Option      "DRI"          "false"
EndSection

Do not create these files in /usr/share/X11/xorg.conf.d. That is the location for example configuration files for X, not the ones that are actually loaded.

I used these steps to fix screen flickering,

sudo gedit /usr/share/X11/xorg.conf.d/20-intel_flicker_fix.conf

paste these lines,

Section "Device"
  Identifier  "Intel Graphics"
  Driver      "intel"
  Option      "TripleBuffer" "true"
  Option      "TearFree"     "true"
EndSection

save, reboot.

If it still doesn't fix it, you can remove is using

sudo rm /usr/share/X11/xorg.conf.d/20-intel_flicker_fix.conf