On Tue, 2021-01-12 at 13:12 +0100, Ingo wrote:
However, when I try to find the display information with "xrandr -q" I get only "Can't open display" with no further information.
Are you logged in through SSH by any chance? If so, give us the full picture of what you are actually doing. And regarding IOhannes suggestions, maybe also describe your goal in more detail.
Roman