Since the feature was added for X.org sessions, I've enabled it when received 5.17.0 update. Today I've found that changing any night color settings doesn't active an "Apply" button, so I'm no longer able to apply any changes I've made. I got stuck on "Times" operation mode, and changing any values (including sunrise/sunset, operation mode, temperature, activate checkbox itself) does actually nothing. STEPS TO REPRODUCE 1. Open settings 2. Go to night color 3. Change any value OBSERVED RESULT Apply button is grayed out EXPECTED RESULT Apply to become active Operating System: KDE neon 5.17 KDE Plasma Version: 5.17.3 KDE Frameworks Version: 5.64.0 Qt Version: 5.13.2 Kernel Version: 5.0.0-36-generic OS Type: 64-bit Processors: 4 × Intel® Xeon® CPU E3-1225 V2 @ 3.20GHz Memory: 23,5 GiB of RAM
I have been able to replicate this myself, current system: Operating System: Manjaro Linux KDE Plasma Version: 5.17.3 KDE Frameworks Version: 5.64.0 Qt Version: 5.13.2 Kernel Version: 5.3.12-1-MANJARO OS Type: 64-bit Appears to be a duplicate of https://bugs.kde.org/show_bug.cgi?id=411584. For me, it also worked for a while until I experimented with different night color settings, and then once I chose 'Times' as the operation mode, it became stuck. Same problem as Komorebi's.
For anyone searching online, there was a reference to this bug and a solution for users who encounter it, mentioned here: https://www.linuxquestions.org/questions/slackware-14/crash-accessing-display-and-monitor-settings-kde-ktown-5_19-0-a-4175662728/
*** This bug has been marked as a duplicate of bug 411584 ***