Comment 15 for bug 1721428

From stacktrace I posted to Gnome peeps:

https://bugzilla.gnome.org/show_bug.cgi?id=789166#c6

<quote>
Some code is trying to access a non-existent GSettings key, which is a fatal error:
> message=message@entry=0x563b7a0d4ac0 "Settings schema 'org.gnome.shell.overrides' does not contain a key named 'button-layout'", data=data@entry=0x0)

There isn't any code that tries to read any 'button-layout' key in all of gnome-shell, so this is either a bug in an extension or in a downstream patch.
</quote>

This only gets triggered when monitor goes into standby...