https://bugs.kde.org/show_bug.cgi?id=516047
Bug ID: 516047
Summary: Incorrect color management with kwin and Nvidia combo
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
Using kwin and nvidia combo results in a limited color space.
STEPS TO REPRODUCE
1. Use KDE with Nvidia proprietary drivers
OBSERVED RESULT
Using KDE + Nvidia combo:
* No difference in here (on chrome): https://www.wide-gamut.com/test/image-sdr
where sRGB and P3 look identical.
* `kscreen-doctor -o` results in `Color resolution: unknown`
* GUI System Settings -> Display Configuration does NOT HAVE `Limit color
resolution to`
Using intel iGPU via a laptop:
* introduces color differences https://www.wide-gamut.com/test/image-sdr
* screen is a bit dimmer under the same brightness level (due to sRGB being
sRGB and an extra `kick` left for wider color spaces)
* `kscreen-doctor -o` results in `Color resolution: automatic (10), range: [6;
12] bits per color`
* Display settings do HAVE `Limit color resolution to`
I did test with a couple of different screens (i.e., a monitor and a projector)
=> same outcome.
EXPECTED RESULT
Kwin + nvidia acts same as on the laptop with intel iGPU.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.20.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-14-generic (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 9900X 12-Core Processor
Memory: 69 GB of RAM (67.0 GB usable)
Graphics Processor: NVIDIA GeForce RTX 5070 Ti
ADDITIONAL INFORMATION
Nvidia drivers: 580.126.09
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