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Full RGB

nano ~/'.config/monitors.xml'

        </mode>
        <rgbrange>full</rgbrange>
        <maxbpc>12</maxbpc>
      </monitor>

sudo cp -fv ~/'.config/monitors.xml' '/etc/xdg/monitors.xml'

Reset

sudo rm -fv ~/'.config/monitors.xml' '/etc/xdg/monitors.xml'