On Thu, 10 Aug 2017 16:39:33 +0200, Ralf Mardorf wrote: >[rocketmouse@archlinux ~]$ xdpyinfo | grep "screen" -A2 # HDMI LCD on >and VGA CRT off >default screen number: 0 >number of screens: 1 > >screen #0: > dimensions: 1920x1080 pixels (506x285 millimeters) > resolution: 96x96 dots per inch ^^^^^ [rocketmouse@archlinux ~]$ xdpyinfo | grep "screen" -A2 # HDMI LCD on and VGA CRT off default screen number: 0 number of screens: 1 screen #0: dimensions: 1920x1080 pixels (502x282 millimeters) resolution: 97x97 dots per inch ^^^^^ Seemingly xdpyinfo is buggy, not only the millimeters are wrong, also the dpi value isn't always the same.