New answers tagged xrandr
Since posting this question I have found a partial solution. I looked at instructions on ArchWiki (https://wiki.archlinux.org/index.php/Xrandr) and found that they worked (even though I tried them before; I don't know what I was doing wrong then). By following the instructions on that page, I was able to change to widescreen mode with xrandr. My problem now ...
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