https://bugs.kde.org/show_bug.cgi?id=502630
Bug ID: 502630
Summary: Screen Mirroring doesn't take monitor rotation into
account
Classification: Plasma
Product: kwin
Version: git-stable-Plasma/6.3
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: w...@savethevowels.org
Target Milestone: ---
SUMMARY
This is a bit of an odd one. I have a device (GPD Pocket 4) which has a display
which is wired to be vertical, used horizontally. As a result, I need to use
screen rotation to get the proper aspect ratio horizontally. Kwin does fine
with this, using display settings.
However, when I connect a second monitor, everything goes off the rails.
STEPS TO REPRODUCE
1. Have a display which is properly oriented only when rotated.
2. Connect a second monitor which is naturally oriented.
3. Hit "Mirror Screens"
EXPECTED
The built in display mirrors the external display, letterboxing where needed,
with both displays oriented as they would be if selected individually, at a
shared resolution.
OBSERVED RESULT
Depending on rotation in display settings, the 16:10 internal display is
mirrored as a 10:16 display which is oriented correctly (but aggressively
letterboxed, and in an aspect ratio not reproducible on the second display) OR,
the screens are mirrored properly, but the built-in display is oriented
according to the natural (right side down) rotation of the screen, and
letterboxing takes up the majority of the screen.
Put differently, there appears to be no permutation of display settings which
results in both the correct orientation of the screen, and the correct,
horizontal is wider aspect ratio. You can choose one, or the other, and the
Meta+P mirror displays command gives the 10:16 version, which is arguably the
worse of the two. Changing display orientation at the kernel level does not
appear to fix this, although it does make the LUKS unlock orient properly.
Thanks!
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.13.9-200.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen AI 9 HX 370 w/Radeon 890M
Memory: 30.9 GiB of RAM
Graphics Processor: AMD Radeon Graphics
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