All the options of the "Orientation (degrees clockwise)" setting of the "Configure Display" dialog are greyed out except for "Normal". I have a landscape/portrait display and would like to set it to "Left (90 degrees)". Where can I start troubleshooting to find out why these options are greyed out?
If you have an actual landscape/portrait display, this option isn't going to do it. A monitor that allows you to rotate the screen in the stand is not really a landscape/portrait display.
IAC, it is not your display that you configure, it is your video card that needs to be configured. I suspect that the ability to use the simulated portrait display mode (Vertical raster scanning) is dependent on which video card driver you are using. And in the unlikely event that you actually have true portrait display, you would require a video card that would support it.
To trouble shoot, you should check to see that you have the Randr extension enabled.
xdpyinfo | grep RANDR
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