Can confirm that this is happening in 20.04 as well.
I am using xorg (not wayland) with:
- Ubuntu 20.04 (updated daily)
- AMD Radeon RX590
- one 4k display scaled to 200%
- one 1080p display at default 100%
Every time I reboot I must set the 200% scaling again for the 4k
display.
--
You
Public bug reported:
This is seen both in Youtube and also other web-based videos as well as
when videos are viewed using the local video player application.
When a video is set to be viewed in fullscreen, the video flickers and
continually resizes itself.
Hardware:
Two displays, with one set