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I'm trying to calculate the size of my 2 screens together.

Using xdpyinfo, I see the following: xdpyinfo | grep 'dimensions:' dimensions: 5120x1600 pixels (1355x423 millimeters)

However, individually xrandr shows: 

xrandr | grep ' connected'
DP-4.8 connected 2560x1600+2560+0 (normal left inverted right x axis y axis) 641mm x 401mm
DP-6 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 641mm x 401mm

What could explain this difference?
641m + 641m != 1355m (difference: 72mm)
401m != 423m (difference: 22mm)

Is one of them including the bezel of the monitor and the other is not?

muru
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Trevor Hickey
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    No, it's simply that `xdpyinfo` is wrong. That's a long [story](https://bugs.freedesktop.org/show_bug.cgi?id=23705). See also [this](https://unix.stackexchange.com/questions/75344/how-does-x-server-calculate-dpi). –  Sep 26 '18 at 20:32

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