Bug#979622: Wayland: No image on external display when reconnecting

[Oliver Sander <oliver.sander@tu-dresden.de>]

Package: kscreen
Version: 4:5.20.5-1
Severity: normal

Apologies if I am not reporting this for the correct package.

I try the following steps:

1) Reboot my laptop (ThinkPad X1 Yoga) with external monitor plugged in.
   The external monitor works as expected.
2) At the SDDM prompt, log into Plasma Wayland.
   The external monitor still works as it should.
3) Disconnect the external monitor
   Still everything appears to work as it should.
4) Reconnect the monitor -- it remains black and tells me 'no signal'
   Nevertheless, the system settings dialog shows me that the
   external display is correctly recognized.  From looking
   at that dialog everything seems to be in order.
5) Log out of Plasma Wayland, and log back in.
6) The external display is back!

This does not happen with Plasma X11.



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

Kernel: Linux 5.10.0-1-amd64 (SMP w/8 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages kscreen depends on:
ii  kde-cli-tools                  4:5.20.5-2
ii  libc6                          2.31-9
ii  libkf5configcore5              5.77.0-2
ii  libkf5coreaddons5              5.77.0-2
ii  libkf5dbusaddons5              5.77.0-2
ii  libkf5declarative5             5.77.0-2
ii  libkf5globalaccel-bin          5.77.0-3
ii  libkf5globalaccel5             5.77.0-3
ii  libkf5i18n5                    5.77.0-2
ii  libkf5plasma5                  5.77.0-2
ii  libkf5plasmaquick5             5.77.0-2
ii  libkf5quickaddons5             5.77.0-2
ii  libkf5screen-bin               4:5.20.5-1
ii  libkf5screen7                  4:5.20.5-1
ii  libkf5xmlgui5                  5.77.0-2
ii  libqt5core5a                   5.15.2+dfsg-2
ii  libqt5dbus5                    5.15.2+dfsg-2
ii  libqt5gui5                     5.15.2+dfsg-2
ii  libqt5qml5                     5.15.2+dfsg-2
ii  libqt5quick5                   5.15.2+dfsg-2
ii  libqt5sensors5                 5.15.2-2
ii  libqt5widgets5                 5.15.2+dfsg-2
ii  libstdc++6                     10.2.1-3
ii  plasma-framework               5.77.0-2
ii  qml-module-qtgraphicaleffects  5.15.2-2

Versions of packages kscreen recommends:
ii  upower  0.99.11-2

kscreen suggests no packages.

-- no debconf information

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