Bug 395901

Summary:	Setting gamma for individual screens does not work
Product:	[Applications] systemsettings	Reporter:	Thomas Mitterfellner <thomas>
Component:	kcm_kgamma	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	ae, bugs, kdedev, neuromancerx1, whizmo
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Thomas Mitterfellner 2018-06-26 19:28:29 UTC

I have two screens set up: my laptop's screen and an external monitor connected via HDMI. The "sync screens" checkbox is not checked, but strangely, the combo box is greyed and only shows "Screen 1" despite the Display section of the configuration module showing both monitors. Consequently, both screens are affected when I drag the slider.

Am I misunderstanding what is written here: https://docs.kde.org/trunk5/en/kde-workspace/kcontrol/kgamma5/index.html – should it actually be possible to set the gamma for each display individually when I use two screens with only one graphics card? Is there a difference between a "screen", a "display" and a "monitor" in that context or are they same? If that should actually work, what can I do to debug it (provide debug info)?

Comment 1 Sebastian Kügler 2018-06-27 07:23:59 UTC

Thanks for the bugreport! I've corrected the component of this bugreport, the gamma settings are not actually a part of KScreen, but have their own component.

Comment 2 Michael Zapf 2020-06-16 19:58:39 UTC

I have the same issue with a monitor on HDMI-A-0 and a Wacom Cintiq on HDMI-A-1. The combo box is deactivated so that I can only change the settings of both screens in sync.

I'd like to be able to change the gamma settings for each screen individually.

Comment 3 Alexander Ewering 2020-12-21 13:31:52 UTC

Same here... any update on this? I have one monitor connected via HDMI and another via VGA to an on-board Intel graphics card. The combobox is greyed out, but all other parts of System Settings do recognize the two displays separately.

Comment 4 TraceyC 2025-04-29 22:59:18 UTC

This is also being discussed in bug 476960. I'm going to close this as a duplicate of the other report, which has involvement from KDE contributors. Please follow the other report for updates.

*** This bug has been marked as a duplicate of bug 476960 ***