More information: listing the display outputs:
$ find /sys/devices -name "edid"
/sys/devices/platform/simple-framebuffer.0/drm/card0/card0-Unknown-1/edid
/sys/devices/pci:00/:00:01.0/:01:00.0/drm/card2/card2-DP-2/edid
/sys/devices/pci:00/:00:01.0/:01:00.0/drm/card2/card2-DVI-D-1/edid
/sys/devices/pci:00/:00:01.0/:01:00.0/drm/card2/card2-HDMI-A-3/edid
/sys/devices/pci:00/:00:02.0/drm/card1/card1-HDMI-A-1/edid
/sys/devices/pci:00/:00:02.0/drm/card1/card1-HDMI-A-2/edid
/sys/devices/pci:00/:00:02.0/drm/card1/card1-DP-1/edid
I've tried to delete the /dev/dri/card0 with:
$ sudo rm -f /dev/dri/card0
But this workaround not worked for me.
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https://bugs.launchpad.net/bugs/2060268
Title:
Phantom monitor (simpledrm) shown in Settings after installing the
Nvidia driver
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