Since I updated my wife's computer, I can no longer select a display configuration. It's currently stuck on 1024x768 and refresh rate 76 Hz, quite unusable. If I click on either pull-down menu, there is only the one choice.

Running kernel version 5.4.0-59-generic with KDE plasma version 5.20.5. It works fine on my computer at the same level. My wife normally uses a config of 1200 to 1400 lines because of her AMD.

Thanks in advance for any suggestions.

Hi if you can drop to the command line and type xrandr you can see what resolutions are available.

Also see the command man page and if you scroll to the bottom you can see some examples.

https://www.commandlinux.com/man-page/man1/xrandr.1.html