gnome - How to create virtual monitor with xrandr without increasing HDMI screen width? - Ask Ubuntu
xrandr: failed to get size of gamma for output default (connected via HDMI - Linux Mint 18.03) - YouTube
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xssfox parody account (@xssfox@cloudisland.nz) on Twitter: "The original blog post generator javascript had a bug in it that caused outputs like this. I have updated the generator. Sorry if this caused confusion.
显示器不输出xrandr warning: output HDMI-1 not found_warning: output hdmi-1-0 not found; ignoring_MuXi_J的博客-CSDN博客
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xrandr not detecting HDMI : r/linuxquestions
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