Bug 434683 - Wayland only - Secondary display doesn't come back on after disconnecting and reconnecting
Summary: Wayland only - Secondary display doesn't come back on after disconnecting and...
Status: RESOLVED DUPLICATE of bug 442980
Alias: None
Product: kwin
Classification: Plasma
Component: multi-screen (show other bugs)
Version: 5.21.2
Platform: Fedora RPMs Linux
: HI normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: wayland
: 436735 (view as bug list)
Depends on:
Blocks:
 
Reported: 2021-03-20 18:31 UTC by Romain D.
Modified: 2021-10-13 08:36 UTC (History)
13 users (show)

See Also:
Latest Commit:
Version Fixed In: 5.23

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Description Romain D. 2021-03-20 18:31:41 UTC 
With the external display connected to a USB-C hub

STEPS TO REPRODUCE
1. Start the machine with external display connected
2. Disconnect the external display (disconnect the dock)
3. Reconnect the dock

OBSERVED RESULT
external display doesn't come back on ("no signal found")

EXPECTED RESULT
external display to come back as it was prior to disconnecting the first time

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.21.2
(available in About System)
KDE Plasma Version: plasma-workspace-5.21.2-1.fc33.x86_64
KDE Frameworks Version: kf5-plasma-5.79.0-2.fc33.x86_64
Qt Version: qt5-qtbase-5.15.2-15.fc33.x86_64

ADDITIONAL INFORMATION
This behavior is only reproducible in Wayland
Comment 1 Nate Graham 2021-03-21 03:04:42 UTC 
I feel like we have a bug report already tracking this, but I can't find it right now.
Comment 2 Armin 2021-04-29 06:42:09 UTC 
I can also reproduce this bug on my Fedora 34 (KDE spin) system.

SOFTWARE/OS VERSIONS
OS: Fedora 
Kernel: x86_64 Linux 5.11.15-300.fc34.x86_64
DE: KDE 5.80.0 / Plasma 5.21.4
CPU: Intel Core i7-7600U
GPU: Mesa Intel(R) HD Graphics 620
Comment 3 Nate Graham 2021-05-07 18:37:29 UTC 
*** Bug 436735 has been marked as a duplicate of this bug. ***
Comment 4 harry 2021-07-09 13:07:11 UTC 
I intermittently get this bug on Kubuntu 21.04. It happens when the dock gets disconnected, but not when the screens themselves get disconnected from the dock. 

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-22-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-8850H CPU @ 2.60GHz
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
Comment 5 David Edmundson 2021-09-17 23:21:23 UTC 
Screens support has changed a lot since then. Lets make a new bug if we still have issues.
Comment 6 Méven Car 2021-10-13 08:36:53 UTC 

*** This bug has been marked as a duplicate of bug 442980 ***