https://bugs.kde.org/show_bug.cgi?id=506501
Bug ID: 506501
Summary: Cannot use both display port and hdmi with different
resolution at the same time
Classification: Plasma
Product: kwin
Version First 6.4.1
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
After upgrading from Fedora 41 to 42, my dual display setup no longer works
correctly. Only one display can be activated at a time.
Main display is on display port, secondary is on HDMI.
STEPS TO REPRODUCE
1. Use an AMD GPU (Radeon RX580)
2. Plug an UHD (4k) display to its Display Port output
3. Plug another display (1080p) to its HDMI output
4. Open Plasma settings > Display & Monitor
5. Enable both displays at max resolution
6. Apply
OBSERVED RESULT
Secondary display is not enabled
An error appears; "Couldn’t apply display configuration: The driver rejected
the output configuration"
EXPECTED RESULT
Secondary display is enabled. No error occurs.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 1600X Six-Core Processor
Memory: 16 GiB of RAM (15,5 GiB usable)
Graphics Processor: AMD Radeon RX 580 Series
OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 580 Series (radeonsi, polaris10, ACO, DRM
3.63, 6.15.4-200.fc42.x86_64)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.0.7
ADDITIONAL INFORMATION
I can still enable my HDMI output if I disable the Display port output before
applying.
I can enable both displays if I set them both to 1080p resolution.
When the error occurs, I see the following log in journalctl:
kwin_wayland[2064]: kwin_wayland_drm: Atomic modeset test failed! Invalid
argument
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