The issue seems to have been reported upstream as well, see e.g
https://gitlab.gnome.org/GNOME/gnome-control-center/issues/18
** Changed in: gnome-control-center (Ubuntu)
Status: New => Triaged
** Summary changed:
- Save button missing in screen
+ Save button missing in screen config for
Yes.
Screen 1: 3840 x 2160 scaling 200%
Screen 2: 1680 x 1050 scaling 100%
Had to go back to xorg
It worked (for the most part) in 17.04.
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The log has this warning
"Config not applicable:
GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Logical monitor
scales must be identical"
Do you scaling for the monitors? Which values?
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