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Description of problem:
mutter can't save display layout configuration when fractional scaling is enabled and not only when scaling is enabled

My particular config:
1x full HD monitor
1x QHD monitor with fractional scaling 125%
laptop lid closed, build in display off

Version-Release number of selected component (if applicable):
control-center-3.26.2-1.el7
mutter-3.26.2-3.el7

How reproducible:
100%

Steps to Reproduce:
1.
2.
3.

Actual results:
(gnome-control-center:8374): display-cc-panel-WARNING **: Config not applicable: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Logical monitors not adjecent

Expected results:


Additional info:
I started to file this bz in rhbz1512448 so maybe look there for more initial info.

Created attachment 1357604 [details]
modetest when I configured and save my monitor setup

Created attachment 1357668 [details]
modetest when I re-dock

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0770