[Bug 1806543] [NEW] Plasma Desktop on multimonitor setup asks to reconfigure desktop layout on every login

[Christopher Snowhill]

Public bug reported:

Every time I log into my desktop, the desktop layout picker box pops
open on the screen, and asks me to pick a layout again. It never
remembers what I pick between log out and log in cycles. It also
completely forgets the refresh rate settings I picked the last time I
was logged in. This is particularly annoying on my other video card, a
Radeon RX 480, because with that card, the two monitors are swapped in
the layout and need to be re-swapped again, every time.

I noticed someone else on AskUbuntu who had this same problem, but
neglected to file a bug report upstream, and instead resorted to the
"fix" of downgrading their machine to Kubuntu 18.04.1, where the issue
does not occur. Somehow, this also fixes their machine's handling of the
Ryzen C6 state deadlock bug, presumably because it may only be a kernel
4.18 issue.

lsb_release -rd:
Description:    Ubuntu 18.10
Release:        18.10

plasma-desktop:
  Installed: 4:5.13.5-1ubuntu4
  Candidate: 4:5.13.5-1ubuntu4
  Version table:
 *** 4:5.13.5-1ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages
        100 /var/lib/dpkg/status

I expected the desktop layout popup to occur on first login only, or on
monitor plug or unplug while logged in, and for it to remember my
settings on log out and subsequent log in.

Instead, it asks for my monitor layout every time I log in, and forgets
my refresh rate override for my primary monitor, which I reset to 120Hz,
even though xrandr recommends 60Hz for some strange reason.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: plasma-desktop 4:5.13.5-1ubuntu4
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Dec  3 21:30:34 2018
SourcePackage: plasma-desktop
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.logrotate.d.apport: [modified]
mtime.conffile..etc.logrotate.d.apport: 2018-12-02T17:13:49.953026

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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Title:
  Plasma Desktop on multimonitor setup asks to reconfigure desktop
  layout on every login

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