https://bugs.kde.org/show_bug.cgi?id=512074
Bug ID: 512074
Summary: Mirror mode forces wrong low resolution on external
monitor, internal display unaffected
Classification: Plasma
Product: KScreen
Version First 6.5.1
Reported In:
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
When I connect my laptop to a TV, with the extended mode, both my laptop's
internal display and my external monitor (XMD Mi TV) work correctly and can be
set to their respective native resolutions.
However, when I switch the display mode to "Mirror," the following problem
occurs:
1. Internal Display: Appears completely normal with the correct resolution.
2. External Monitor (XMD Mi TV): Shows severe abnormalities. Its resolution
becomes very low (far below its native resolution), causing the image to be
blurry, stretched, and compressed, making it almost impossible to see the
content clearly.
STEPS TO REPRODUCE
1. Connect the external monitor (XMD Mi TV) to the laptop.
2. Set the display mode to "Extended." Both displays should now be working
normally.
3. Switch the display mode to "Mirror" (or "Clone").
4. Observe the external monitor. You will see its resolution drop
significantly, becoming blurry and compressed, while the internal display
remains unchanged.
OBSERVED RESULT
In mirror mode, the external monitor is forced to use an extremely low and
incorrect resolution, while the internal display remains unaffected. It appears
that KDE/Wayland's mirroring logic is incorrectly applying the low resolution
or faulty EDID information from the internal display to the external monitor.
EXPECTED RESULT
In mirror mode, the system should automatically select an optimal common
resolution supported by both displays, or at least allow the user to manually
set a common resolution to ensure both screens can display clearly.
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20251110
KDE Plasma Version: 6.5.2
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.7-1-default (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 32 GiB of RAM (30.8 GiB usable)
Graphics Processor: Intel® Arc
ADDITIONAL INFORMATION
I have attached four images:
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