Bug#944695: sddm: Multi-monitor settings lost on reboot

[Jesse Rhodes <jesse@sney.ca>]

Package: sddm
Version: 0.18.0-1
Severity: normal

Dear Maintainer,

My system has 2 screens - a primary display connected to HDMI-0 and a
smaller secondary display to
the right, on DVI-D-1. On boot, the displays are swapped so that the
smaller display is configured
on the left. In the Displays section of KDE system settings, I switch
them around to match their
real-world orientation, but if I reboot, they are swapped again, with
the mouse leaving the right side of
the right-hand screen and appearing on the left side of the left-hand
screen at the sddm login interface,
before logging into the kde session.

It is the same as this thread I found on the KDE forum:
https://forum.kde.org/viewtopic.php?f=309&t=153057
Workarounds specified seem to be targeting sddm, and read as
countering a race condition with xrandr, maybe?
But there's really no reason the settings shouldn't stay the same
across reboots.

sney

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.2.0-3-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN,
TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8),
LANGUAGE=en_CA:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sddm depends on:
ii  adduser                 3.118
ii  debconf [debconf-2.0]   1.5.73
ii  libc6                   2.29-3
ii  libgcc1                 1:9.2.1-19
ii  libpam0g                1.3.1-5
ii  libqt5core5a            5.12.5+dfsg-2
ii  libqt5dbus5             5.12.5+dfsg-2
ii  libqt5gui5              5.12.5+dfsg-2
ii  libqt5network5          5.12.5+dfsg-2
ii  libqt5qml5              5.12.5-3
ii  libqt5quick5            5.12.5-3
ii  libstdc++6              9.2.1-19
ii  libsystemd0             243-5
ii  libxcb-xkb1             1.13.1-2
ii  libxcb1                 1.13.1-2
ii  qml-module-qtquick2     5.12.5-3
ii  x11-common              1:7.7+20
ii  xserver-xorg [xserver]  1:7.7+20

Versions of packages sddm recommends:
ii  haveged                         1.9.8-2
ii  libpam-systemd                  243-5
ii  sddm-theme-breeze [sddm-theme]  4:5.14.5.1-4

Versions of packages sddm suggests:
ii  libpam-kwallet5           5.14.5-1
pn  qtvirtualkeyboard-plugin  <none>

-- debconf information:
  sddm/daemon_name: /usr/bin/sddm
* shared/default-x-display-manager: sddm