This comes from How to enable Night Light feature on DisplayLink devices in Windows 10.

I have a Targus docking station and luckily it used DisplayLink, the key does not exist with the Targus drivers installed so…

  1. Go to and download the DisplayLink drivers.
  2. Install them.
  3. Start RegEdit
  4. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\DisplayLink\Core
  5. Create new String value with name EnableGammaRamp and set the data to be: true
  6. Unplug and plug your DisplayLink device
  7. Enable Night light in Windows

All your monitors should now be at the same gamma settings.