https://bugs.kde.org/show_bug.cgi?id=507439
Bug ID: 507439
Summary: HDR calibrator fails to detect peak brightness unless
ICC profile set to built-in first
Classification: Applications
Product: systemsettings
Version First 6.4.3
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_kscreen
Assignee: kscreen-bugs-n...@kde.org
Reporter: kod...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: ---
SUMMARY
When configuring an HDR display for the first time, the settings applet does
not have the correct peak brightness in the HDR calibrator, as detected from
the display EDID, unless the display is left off HDR mode and the color profile
is set to monitor built-in and applied first. Then it will have the HDR peak
brightness correctly read from the monitor.
STEPS TO REPRODUCE
1. Attach an HDR monitor. (in this case, an Asus XG27UCS)
2. Configure the display to HDR mode.
OBSERVED RESULT
The display in HDR calibrator will not have a properly read peak brightness
level from the EDID.
EXPECTED RESULT
The display should read the initial peak brightness level from the EDID.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
I was able to somehow make the settings panel absorb my monitor's factory
calibrated peak brightness level of 486 nits, by setting the monitor to SDR
again, then setting the ICC profile to monitor built-in and applying. Then when
I enabled HDR, the peak brightness was correctly set.
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