Monitors may be the hardest thing in Linux! I have a monitor which has stopped working after I fiddled with the setup as part of setting up GPU passthrough. There is definitely some kind of setting / config file that's keeping it broken; if I live boot an .iso from USB then the monitor works fine.

How can I clear any saved settings entirely so that the system auto-detects the monitor again? I have deleted any .conf file from /etc/X11/ and /usr/share/X11/xorg.conf.d, and there is no monitors.xml in ~/.config (although I gather there's meant to be one).

EDIT: Also tried rm -rf ~/.local/share/kscreen followed by a reboot to no avail.

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