Bug 509699

***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports

Please remove this comment after reading and before submitting - thanks!
***

SUMMARY

kde 6.4.90 has issues with chrome's unstable hdr support

STEPS TO REPRODUCE
1. install kde 6.4.90 (6.5 beta)
2. install chrome with https://chromium-review.googlesource.com/c/chromium/src/+/6771393/1 such as AUR's google-chrome-dev
3. launch chrome with --enable-features=AcceleratedVideoDecodeLinuxZeroCopyGL,AcceleratedVideoDecodeLinuxGL,AcceleratedVideoEncoder,WaylandWpColorManagerV1


OBSERVED RESULT

colors are incorrect, "background: black" in css shows as dark gray instead of black, hdr content with peak brightness exceeding sdr brightness still caps at sdr white


EXPECTED RESULT

colors should show as expected, "background: black" in css should show as black, hdr content should be able to exceed sdr white

SOFTWARE/OS VERSIONS

note: the following versions are from kinfo after downgrading back to 6.4.5, using kde-unstable repository with kde 6.4.90 shows the issue. 

Operating System: Arch Linux
KDE Plasma Version: 6.4.5 (was 6.4.90)
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7735HS with Radeon Graphics
Memory: 96 GiB of RAM (93.5 GiB usable)
Graphics Processor 1: AMD Radeon RX 7700S
Graphics Processor 2: AMD Radeon 680M

ADDITIONAL INFORMATION

mpv with hdr content still works as expected