https://bugzilla.kernel.org/show_bug.cgi?id=197925
--- Comment #8 from kwkaess@gmx.com --- As of 4.15.0-rc3-00086-g032b4cc8ff84:
#3 is fixed when in single internal monitor configuration. (Yes!)
I will, again, recheck #2 and #3 when I have an external monitor attached.