https://bugs.kde.org/show_bug.cgi?id=475520
Bug ID: 475520
Summary: KDE on Wayland only powers the first connected monitor
on a multi-monitor dock
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: wil...@wwaran.com
Target Milestone: ---
SUMMARY
KDE on Wayland only powers one monitor per display port used despite KDE
showing all monitors in system settings and screenshots/screencaptures showing
all connected monitors. All monitors are enabled and show content prior to
login. After login, it is always the same external monitor that powers on - the
first one in the list of monitors. This is a regression from X11 and a hard
blocker for my daily use.
STEPS TO REPRODUCE
1. Connect multiple monitors to an external laptop dock.
2. Connect the dock to the laptop.
3. Login to a KDE Wayland session.
OBSERVED RESULT
Only the first monitor is powered up and displays content.
EXPECTED RESULT
All monitors are powered up and display content.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.5-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 6 × AMD Ryzen 5 4500U with Radeon Graphics
Memory: 14.9 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: LENOVO
Product Name: 20T8001HUS
System Version: ThinkPad E15 Gen 2
ADDITIONAL INFORMATION
I have verified this to be a KDE issue by validating all monitors are powered
up in a Gnome Wayland session. I have also verified this behavior on both my
normal Arch install and a separate Fedora install on the same laptop hardware.
Finally, I verified this to be different from bug 448220 due to the previously
mentioned consistency, that neither install has the xf86-video-amdgpu package
installed, and that the behavior is unchanged regardless of if the package is
installed or not.
If one of the external monitors is connected to the dock and the other the
laptop's HDMI port, both power on as expected and respond perfectly normally.
It is only when both are connected through the same port that the issue shows.
Unplugging the first listed monitor from the dock causes the second monitor to
power up and display content, however plugging the first listed monitor back
into the dock causes the second monitor to power back down.
It is entirely possible this is a driver or kernel issue that I haven't been
able to nail down; I will gladly take any instruction or assistance with
locating and fixing the issue.
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