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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