Bug 507637

Summary:	Direct scanout doesn't work if ICC profile is set
Product:	[Plasma] kwin	Reporter:	Marcelo Bossoni <mmbossoni>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	xaver.hugl
Priority:	NOR
Version First Reported In:	6.4.2
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Marcelo Bossoni 2025-07-29 16:02:30 UTC

SUMMARY
When playing a full screen game direct scanout is not kicking in if the ICC profile is set for the display

STEPS TO REPRODUCE
1. Set an ICC profile
2. Enable the "Compositing" effect
3. Launch a full screen game

OBSERVED RESULT
Compositing still show up

EXPECTED RESULT
Compositing word is hidden meaning kwin is not compositing anymore

SOFTWARE/OS VERSIONS
Operating System: Nobara Linux 42
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.7-200.nobara.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700X 8-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 6750 XT
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7A37
System Version: 1.0

ADDITIONAL INFORMATION
This also happen on my archlinux box using cachyos kernel
Setting ICC profile no None make direct scanout work

Comment 1 Zamundaaa 2025-07-29 19:37:26 UTC

Yes, that is expected. There's no kernel API (that isn't totally buggy and broken) yet which we could use to apply the required color operations without a shader. Driver developers have been working on one for quite a while and it should be merged soon though.