Public bug reported:
Both OSX and Windows 10 with HiDPI laptops default to downscaled mirror
for LoDPI external monitors/projectors.
Xrandrs is also able to do that, but you cannot do this with Displays
preferences GUI in Ubuntu.
Currently Displays offers only the lowest common resolutions in mirror mode,
but it should also offer the scaled mode for the external screen or maybe even
both options: 'Scale external' and 'Scale built-in'.
This does the trick for my laptop:
xrandr --output eDP-1 --auto --output DP-1 --auto --same-as eDP-1 --scale-from
3200x1800
(assuming eDP-1 is built-in display and DP-1 is external lower-dpi
screen, which is almost always the case for HiDPI laptops nowadays)
** Affects: unity-control-center (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1679313
Title:
There should be a downscale mirror mode in Displays for HiDPI laptops
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