455.38 video playback stutter with multi monitor every 3 seconds

To reproduce:

  1. Connect more than one display to GPU
  2. Play video in windowed (not full screen) VLC, Firefox browser, etc

Expected: video playback should be smooth and free of stutter
Actual: video playback stutters regularly at a 3 second interval

If you simply unplug all but one display, the video playback may be smooth.

This thread describes the same problem and I’ve similarly tried all of the suggestions to no avail.

OS: Pop!_OS 20.04 LTS
GNOME: 3.36.3
Windowing: X11
Nvidia driver: 455.38
Kernel: 5.8.0-7630-generic
Hardware:

  • 2x E5-2690 v3 (24 cores)
  • 128GB DDR4 RAM
  • 1080Ti FTW3
  • 1275W PSU