| Summary: | On X11, mirroring internal laptop 4k screen to external 1080p screen shows clipped output on external screen | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Nate Graham <nate> |
| Component: | platform-x11-standalone | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | REPORTED --- | ||
| Severity: | grave | Keywords: | multiscreen |
| Priority: | NOR | ||
| Version: | git master | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| See Also: | https://bugs.kde.org/show_bug.cgi?id=460246 | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: | Clipped output rather than scaled output | ||
Happens on X11, but not Wayland. Still, seems important to fix on X11 so that the use case of giving a presentation with a high resolution laptop works properly. Now happens on Wayland too; I've filed Bug 460246. |
Created attachment 130148 [details] 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.