[kde] [Bug 462759] New: On Wayland, external monitors cause system to be unusably laggy

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=462759

            Bug ID: 462759
           Summary: On Wayland, external monitors cause system to be
                    unusably laggy
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: fake.name at posteo.net
  Target Milestone: ---

SUMMARY
When connecting to an external monitor via HDMI on Wayland, the entire system
will become laggy to the point that the use of the monitor is not possible; in
addition to the lag, movement is choppy, such that cursors, windows, etc seem
to teleport from place to place, rather than traveling smoothly across the
screen.

This is plasma/kwin specific -- things are working fine on hyprland, for
example.

Placing under unknown location since I'm not sure if this is kwin or kscreen.

STEPS TO REPRODUCE
1. Begin Wayland session
2. Plug in external monitor
3. Observe the crippled system

OBSERVED RESULT
If an external monitor is plugged in, the system immediately becomes laggy and
choppy visually such that use is untenable.

EXPECTED RESULT
The external monitor should not impede system responsiveness.

SOFTWARE/OS VERSIONS
Linux: Arch, running Zen 6.0.11
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7

ADDITIONAL INFORMATION
The system has an NVIDIA rtx 3060 connected to the HDMI out. Both the external
monitor and the internal monitor of the laptop are 4k screens with a 60 Hz
refresh rate set to scale identically. Graphics are meant to be handled
primarily by an intel iGPU.

Drivers are:
nvidia-dkms 525.60.11
mesa-22.2.3-1

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