*** This bug is a duplicate of bug 1754284 ***
https://bugs.launchpad.net/bugs/1754284
Unfortunately you appear to be using two features that will cause this:
Fullscreen windows on the modeset Xorg driver: bug 1754284
Fractional scaling on the modeset Xorg driver: bug 1846398
The only ways to avoid the bars (screen tearing) on a system like yours
would be:
* Choose 'Ubuntu on Wayland' from the login screen to avoid Xorg; or
* Avoid fullscreen windows and avoid fractional scaling, when using
Xorg.
** This bug has been marked a duplicate of bug 1754284
Fullscreen windows are tearing in Xorg sessions
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https://bugs.launchpad.net/bugs/1889100
Title:
Screen bug
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