Comment 79 for bug 1872159

Daniel, with reference to post 76 above, yes: all of my configurations involved with this have one external HDMI display. The laptops run docked, lid down, with the external display as primary. The dock also provides external keyboard and mouse. I've seen it with external displays from less than 1920x1080 up through 3440x1440 when connected via HDMI. So my experience confirms your finding.