https://bugs.kde.org/show_bug.cgi?id=524396
Bug ID: 524396
Summary: Feature Request: Native single-window mirroring to
secondary display
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY / USE CASE
A native KWin feature to mirror ONLY a specific window (e.g. a game) to a
secondary screen/TV, keeping overlays like PiP videos or Alt-Tab menus hidden
from the TV.
STEPS TO REPRODUCE
1. Connect a secondary display (TV).
2. Open a game on the primary display.
3. Open a Picture-in-Picture (PiP) video on top of the game.
4. Try to output only the game window to the TV.
OBSERVED RESULT
Standard display duplicating (mirroring) copies all pixels from screen 1 to
screen 2, showing the PiP video and Alt-Tab overlays on the TV.
EXPECTED RESULT
An option in KWin (e.g., window titlebar -> "Project Window to Screen 2") to
project only the game window in fullscreen to the secondary display, ignoring
primary display overlays.
SOFTWARE/OS VERSIONS
Linux / Wayland
ADDITIONAL INFORMATION
Currently requires third-party tools like OBS Studio (PipeWire Window Capture)
or wl-mirror. A native KWin solution would be much more resource-efficient.
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