Bug 426121

Summary:	Nightlight turns off when launching Nvidia X Settings
Product:	[Applications] systemsettings	Reporter:	Viko <transtrike>
Component:	kcm_nightcolor	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	kwin-bugs-null
Priority:	NOR
Version:	5.19.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Viko 2020-09-02 20:49:31 UTC

SUMMARY
Nightlight turns off when launching Nvidia X Settings. The option is still toggled on, but night color doesn't work anymore. To fix it, you need to disable the night color(animation from the chosen color to normal does happen/occur) and re-enable it. Every opening of the NVIDIA X Server Settings causes the Night Color to stop working until re-enabled.

STEPS TO REPRODUCE
1. Turn on Night Color
2. Open application NVIDIA X Server Settings

OBSERVED RESULT
- Night Color turns off

EXPECTED RESULT
- None

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux x86_64(last update 02.09.2020)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.19
Qt Version: 
- QMake version 3.1
- Using Qt version 5.15.0 in /usr/lib

ADDITIONAL INFORMATION
NVIDIA Driver Version: 450.66

Comment 1 Christoph Feck 2020-09-28 10:34:26 UTC

The nvidia-settings tool resets the X11 gamma ramps even if you didn't configure any gamma curve related settings in the tool. That's a bug that you could report to NVIDIA developers.

Additionally, X11 unfortunately has no way to cascade gamma curves, so each tool replaces the gamma curve settings of each other tool.

*** This bug has been marked as a duplicate of bug 413134 ***