[ubuntu] Problem with monitor display suddenly "distorted"

[ubuntu] Problem with monitor display suddenly "distorted"

 
Ubuntu 18.04.5, gnome shell 3.28.4, x11 x.org 1.19.6

Suddenly, with no changes or reason that I am aware of, when I turn on the computer and then log in to my user account, one of the three monitors (always the same monitor, it has an HDMI connection) displays the ubuntu desktop but it is very distorted. I don’t know what other word to use than “distorted”. But – What I have stumbled on is that, after the computer has booted up, and I am confronted with this one monitor displaying everything distorted, if I log out of my user, and then log back in to my user, that problem goes away, everything displays beautifully. This happens on only one of the three monitors, and always that same monitor.

I don’t know where to start to diagnose what the problem and, and how to fix this.

What should I do to find what is wrong, and how to fix this? Thanks for any help.

 

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