https://bugs.kde.org/show_bug.cgi?id=520274
Bug ID: 520274
Summary: Multi-monitor hotplug loop (connected/disconnected) on
KWin Wayland with AMD GPU
Classification: Plasma
Product: kwin
Version First 6.6.3
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
--- DESCRIPTION ---
When using KDE Plasma Wayland (KWin), connecting a second monitor via HDMI
causes a continuous hotplug loop where the system repeatedly detects the
display as connected and disconnected.
My setup uses a DisplayPort monitor as the primary display and an HDMI monitor
as the secondary display.
The issue depends on connection order and monitor power state:
- If both monitors are already connected from boot, everything works normally.
- If the DisplayPort monitor is connected first (normal boot scenario) and then
the HDMI monitor is plugged in, the hotplug loop starts immediately.
- If the HDMI monitor is connected first and then the DisplayPort monitor is
connected, it works correctly.
- If the monitor is physically connected but powered off (using the monitor
power button) and then powered on, it works correctly.
- If the monitor is already powered on (monitor power button) at the moment of
connection or detection, the loop occurs.
This does not happen under GNOME Wayland using the same hardware, kernel, and
drivers
The issue appears to be specific to KWin's handling of display outputs under
Wayland, as the display status continuously flips between connected and
disconnected
This behavior has been confirmed using: watch -n 0.1 cat
/sys/class/drm/card1-HDMI-A-1/status
--- STEPS TO REPRODUCE ---
1. Boot the system
2. Log into KDE Plasma Wayland session
3. Connect the HDMI monitor (or disconnect and reconnect it if already
connected)
4. Observe that the HDMI output starts repeatedly connecting and disconnecting
--- OBSERVED RESULT ---
Display repeatedly toggles between connected/disconnected in a loop
--- EXPECTED RESULT ---
Both monitors should remain stably connected after being plugged in or detected
by the system, without any repeated connect/disconnect events. Display
configuration should remain persistent and consistent regardless of connection
order or monitor power state
--- SOFTWARE/OS VERSIONS ---
Operating System: Fedora Linux 44
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.26.0
Qt Version: 6.10.3
Kernel Version: 7.0.8-200.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 6750 XT
--- ADDITIONAL INFORMATION ---
This issue has also been reproduced on CachyOS, indicating it is not specific
to Fedora
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