*** Nightcolor fails to activate after KWin or the whole session is restarted; must manually toggle it off and on again the problem is caused by a conflict between Night Color and 'Gamma Settings'. Operating System: Kubuntu 24.04 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-45-generic (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor Memory: 31.3 Gio of RAM Graphics Processor: NVIDIA GeForce GTX 1660 SUPER/PCIe/SSE2 Manufacturer: Gigabyte Technology Co., Ltd. Product Name: B450M S2H ***
It's fixed in Plasma 6.0 and later *** This bug has been marked as a duplicate of bug 413134 ***