https://bugs.kde.org/show_bug.cgi?id=517628
Bug ID: 517628
Summary: Direct scanout does not work when HDR is enabled
Classification: Plasma
Product: kwin
Version First 6.6.2
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Direct scanout does not work with any game or fullscreen app when HDR is
enabled in KDE's display settings. I've tested with mpv, Resident Evil Requiem,
Scorn, and Ghostwire: Tokyo.
STEPS TO REPRODUCE
1. Enable HDR in Display Configuration
2. Open Kwin debug console and load the showcompositing effect
3. Play a fullscreen video in mpv or load into a game save
4. Notice that the Compositing text still shows in the top right corner,
indicating that direct scanout is not in use.
5. Disable HDR
6. Retry the test and notice that Compositing text disappears, indicating
direct scanout is in use.
OBSERVED RESULT
HDR prevents direct scanout from working. In games I've noticed an increase in
input latency and juddering in frame pacing due to the lack of direct scanout.
EXPECTED RESULT
Direct Scanout should work even if HDR is enabled.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.6.2
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.2
Kernel Version: 6.19.8-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 64 GiB of RAM (62.4 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 3090
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: X870E AORUS ELITE WIFI7
ADDITIONAL INFORMATION
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