https://bugs.kde.org/show_bug.cgi?id=492514
Bug ID: 492514
Summary: Use of an ICC profile on a display causes massive GPU
usage
Classification: Plasma
Product: kwin
Version: 6.1.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: kwin-bugs-n...@kde.org
Reporter: nafend...@gmail.com
Target Milestone: ---
Created attachment 173220
--> https://bugs.kde.org/attachment.cgi?id=173220&action=edit
DisplayCAL internal display ICC, Datacolor SpyderX
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SUMMARY
At least on an Intel Gen9 graphics platform (i7-8650U with the UHD 620 iGPU),
setting an ICC profile created by DisplayCAL will cause GPU usage to increase
by a huge amount, especially when there is a video playing on the color-managed
display. When moving a video between a display that has an applied ICC profile
and one that does not, the difference in GPU usage and power consumption is
immediately noticeable.
STEPS TO REPRODUCE
1. Start playing a video or do something else that causes constant screen
content changes
2. Begin monitoring the system's GPU usage or power consumption
3. Go to the Display and Monitor configuration and load an ICC calibration
profile for the display that the video is playing on
OBSERVED RESULT
GPU usage increases substantially along with power consumption, intel_gpu_top
shows that kwin_wayland is the process responsible
The Render/3D usage can reach as high as 80% on the testing system
EXPECTED RESULT
No noticeable change in GPU usage or power consumption, much like with Night
Color
SOFTWARE/OS VERSIONS
Arch Linux, Plasma 6.1.4, QT 6.7.2, running Wayland 1.23.0,
plasma-wayland-protocols 1.13.0, wayland-protocols 1.37
ADDITIONAL INFORMATION
Machine is a Dell Latitude 7390 2-in-1 with the i7-8650U, which is equipped
with the Intel UHD 620 iGPU
Attached is the ICC profile which DisplayCAL generated for the internal
display, although the same problem occurs when an external display is
calibrated as well
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