| Summary: | kscreen-doctor reports RgbRange "unknown" and a peak brightness of 0 nits for the LG CX | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | bahhz2lx |
| Component: | colour-management | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | kde, xaver.hugl |
| Priority: | NOR | ||
| Version: | 6.2.2 | ||
| Target Milestone: | --- | ||
| Platform: | Fedora RPMs | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/plasma/libkscreen/-/commit/7660ca1b6ccd2beeaaf40f91f8fd64ec3e6bb704 | Version Fixed In: | |
| Sentry Crash Report: | |||
| Attachments: | kscreen-doctor -o | ansifilter > kscreen.txt | ||
This is expected. Your graphics driver doesn't support reporting or controlling rgb range, and the screen doesn't report a peak brightness (which is what the zero means). A possibly relevant merge request was started @ https://invent.kde.org/plasma/libkscreen/-/merge_requests/205 Git commit 5e019ba5dba8da4509849b6f821a24a145421b89 by Xaver Hugl. Committed on 06/11/2024 at 12:34. Pushed by zamundaaa into branch 'master'. doctor: clarify the meaning of max. brightness zero M +10 -2 src/doctor/doctor.cpp https://invent.kde.org/plasma/libkscreen/-/commit/5e019ba5dba8da4509849b6f821a24a145421b89 Git commit 7660ca1b6ccd2beeaaf40f91f8fd64ec3e6bb704 by Xaver Hugl. Committed on 07/11/2024 at 13:45. Pushed by zamundaaa into branch 'Plasma/6.2'. doctor: clarify the meaning of max. brightness zero (cherry picked from commit 5e019ba5dba8da4509849b6f821a24a145421b89) Co-authored-by: Xaver Hugl <xaver.hugl@gmail.com> M +10 -2 src/doctor/doctor.cpp https://invent.kde.org/plasma/libkscreen/-/commit/7660ca1b6ccd2beeaaf40f91f8fd64ec3e6bb704 |
Created attachment 175350 [details] kscreen-doctor -o | ansifilter > kscreen.txt SUMMARY kscreen-doctor reports RgbRange "unknown" and a peak brightness of 0 nits for the LG CX STEPS TO REPRODUCE 1. navigate to the terminal and run kscreen-doctor -o OBSERVED RESULT see attachment EXPECTED RESULT RGB range should not be unknown and peak brightness should be greater than 0 nits SOFTWARE/OS VERSIONS Linux/KDE Plasma: Operating System: Fedora Linux 41 KDE Plasma Version: 6.2.2 KDE Frameworks Version: 6.7.0 Qt Version: 6.7.2 Kernel Version: 6.11.5-300.fc41.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor Memory: 30.5 GiB of RAM Graphics Processor: NVIDIA GeForce RTX 4090/PCIe/SSE2 ADDITIONAL INFORMATION Output: 1 HDMI-A-2: refers to the LG CX Output: 2 DP-3: refers to a Denon x3800H which is plugged in via DP -> HDMI adapter The ladder is not plugged into any other device via HDMI passthrough. Both devices are connected to the same Nvidia 4090 GPU via HDMI + DP ports modinfo -F version nvidia 565.57.01 Note: It's unlikely that this is issue is exclusive to the 565 beta drivers I've actually never seen it work properly even with previous stable releases.