https://bugs.kde.org/show_bug.cgi?id=501243
Bug ID: 501243
Summary: Fullscreen operation of surface that doesn't cover
whole output breaks when not in direct scanout
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: o...@np880.ru
Target Milestone: ---
SUMMARY
According to xdg-shell protocol if the surface doesn't cover the whole output,
the compositor will position the surface in the center of the output and
compensate with border fill covering the rest of the output. In KWin it's only
work when direct scanout is engaged. When direct scanout doesn't work (HDR,
cursor drawing) KWin puts surface to the left side of the output and doesn't
fill borders with anything.
STEPS TO REPRODUCE
1. Make sure direct scanout won't engage
2. Launch any SDL3 (or SDL2 with sdl2-compat installed) application with next
environment variables: SDL_VIDEO_DRIVER=wayland
SDL_VIDEO_WAYLAND_MODE_SCALING=aspect
3. Set resolution with aspect ratio different from output's
OBSERVED RESULT
Surface would be moved to the left side of the output and borders won't be
filled with anything
EXPECTED RESULT
Surface should be treated just like with direct scanout.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.6-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 62.5 ГиБ of RAM
Graphics Processor: AMD Radeon RX 6700 XT
Manufacturer: ASUS
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