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New monitor keeps switching to 1024x768

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bog

I recently got a new monitor and it occasionally switches from 1920x1080 to 1024x768. When I go to the Display Configuration settings after it happens, anything above 1024x768 is no longer available as an option (i.e., the dropdown menu goes from 640 to 1024 and no higher). After rebooting, "1920x1080" is available in system settings again.

I am running Kubuntu 20.04 with KDE Plasma 5.18.8.

I haven't been able to determine what triggers this behavior. Updating has caused it once or twice, but not always. Switching to TTY2-TTY6 always causes it.

That's not very much to go on, but this is quite frustrating. I'm a newcomer to Kubuntu/Linux and I know very little about hardware, but I like reading documentation -- I just don't know where to start looking and I need a nudge in the right direction. X11? Drivers? Thanks a bunch.

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