I have a slightly older HP ProBook Laptop with integrated Intel graphics running Ubuntu 18.04 on kernel 4.19.0 and the external screen (DisplayPort connection) gets tearing and then goes dark for a second and then comes back. It keeps doing this over and over again and it's impossible to do any work on it. Things that stop this from happening:

  • Lowering the resolution from 1920x1080 to 1600x900
  • Switching to console mode

This issue does not affect the integrated display.

Things that I have tried that have not had any effect:

  • Increasing the amount of video memory in the BIOS
  • Setting vm.swappiness=15 in /etc/sysctl.conf (from default of 60)
  • Installing and upgrading xserver-xorg-video-intel package
  • Trying different environments (same problem with Unity, Wayland, Gnome, etc.)
  • Plugging the monitor directly into the laptop or via docking station
  • Swapping out monitors entirely
  • Adding "TearFree" "true" to the /etc/X11/xorg.conf file
  • Upgrading kernel to 4.19.60

Any ideas would be greatly appreciated.

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