1. xrandr

I generated the output and attached the section for the external
display. I guess the first line already shows the problem:

    HDMI-1 connected 1920x1080+1366+0 (0x8b) normal (normal left
inverted right x axis y axis) 160mm x 90mm

It includes "160mm x 90mm" which probably translates to 7".

2. apport

I generated the requested log. I installed Ubuntu 17.04, upgraded to
17.10 and now upgraded to 18.04. I use the latest kernel from
kernel.ubuntu.com.

** Attachment added: "xrandr output for external display"
   
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1792167/+attachment/5188367/+files/xrandr.log

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https://bugs.launchpad.net/bugs/1792167

Title:
  Display size detected incorrectly

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