https://bugs.kde.org/show_bug.cgi?id=424254
Bug ID: 424254
Summary: Mirroring internal laptop 4k screen to external 1080p
screen shows clipped output on external screen
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 130148
--> https://bugs.kde.org/attachment.cgi?id=130148&action=edit
Clipped output rather than scaled output
All KDE software built from source today on top of openSUSE Tumbleweed.
STEPS TO REPRODUCE
1. Have a laptop with a 4k screen
2. Set appropriate >100% scale factor in KScreen KCM (I'm using 250%)
2. Plug in an external 1080p screen via HDMI
OBSERVED RESULT
External screen shows only the top-left quarter of the internal screen. See
attached screenshot.
EXPECTED RESULT
external screen shows an exact mirror of the internal screen, but scaled to fit
rather than clipped.
ADDITIONAL INFORMATION
Reproduces both with and without PLASMA_USE_QT_SCALING=1 set in the
environment, so it doesn't seem to be related to that.
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