Comment 7 for bug 1890141

https://www.reddit.com/r/Ubuntu/comments/iesevz/fractional_scaling_full_screen_video_causes_this/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

This is my video link which I posted on Reddit, same bug has affected me with i915 driver.

One little note: This isn’t a case when I added upscaled monitor resolution (for me, it is 2160x1440 150% to 2880x1920 200%) config and setting intel to modesetting driver on /etc/X11/xorg.conf.d

There are two options for setting the correct scaling:
1. Using xrandr scaling options, causes tearing and fullscreen inconsistencies
2. Adding new upscaled monitor resolution with xrandr and choosing that

Second options has always worked flawlessly for me, but want to make a warning: second option doesn’t work on between kernel 5.0 and 5.4 (that means it doesn’t work on LTS kernel). They reverted a patch after 5.5, and it works flawlessly. Here’s the trick files that I’ve created: https://github.com/nekr0z/linux-on-huawei-matebook-13-2019#display

I think Ubuntu’s X11 fractional scaling method uses the first one, and that’s indeed buggy.