Bug 521374

Summary:	MHC2 HDR ICC profiles with ColorControl brightness boost cause colors to wash out more in KDE than on Windows 11
Product:	[Plasma] kwin	Reporter:	Iwaku <iwakureal>
Component:	colour-management	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	kdedev, nate, xaver.hugl
Priority:	NOR	Flags:	iwakureal: NVIDIA+
Version First Reported In:	6.6.91
Target Milestone:	---
Platform:	CachyOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Contains all 3 ICC profiles and their JSON/XML formats decoded with iccDEV

Description Iwaku 2026-06-12 02:01:31 UTC

Created attachment 193096 [details]
Contains all 3 ICC profiles and their JSON/XML formats decoded with iccDEV

DESCRIPTION
I've been using these color profiles a lot on Windows 11, I made them in ColorControl: https://github.com/Maassoft/ColorControl
My current monitor is a KTC M27P6 HDR1400 Mini LED, these profiles use BT.2020 + Gamma ~2.2 and have been set up specifically for 1400 nits.

STEPS TO REPRODUCE
1. Download the attached color profiles
2. Select `M27P6.icm` as the color profile in Display Configuration
3. Apply
4. Repeat 2 and 3 for `M27P6 +15.icm` and compare the white clipping
5. If you also have Windows, repeat 2-4 on Windows and compare

OBSERVED RESULT
On Plasma, applying the profiles with a brightness boost causes noticeable color washing and white colors clip into light non-white colors (think of GitHub's green buttons or even the yellow droplet icon Breeze uses for ICC profiles).

EXPECTED RESULT
On Windows 11, the brightness boost profiles correctly make the entire screen brighter with essentially no whitening, washing out, or clipping (+15% seems to have it very slightly on light grays which is why I also have +10%). It looks great. I wish it would work that well on Plasma.

SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a terminal window): CachyOS Linux
KDE Plasma Version: 6.6.91 (6.7 Beta 2)
KDE Frameworks Version: 6.376
Qt Version: 6.11.1
Kernel Version: 7.0.11-1-cachyos (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Check the attachment for all of the profiles. If any more info is needed I should be able to provide it

Comment 1 TraceyC 2026-06-25 21:13:56 UTC

Thanks for the bug report. Please run the following command and paste the output into this report. This will give the kwin developers some basic information about your displays:

kscreen-doctor -o

Also, can you please attach the output of drm_info, after running it in a terminal, to this report?

You'll need to pipe the output of drm_info into a file ( drm_info > ~/info.txt)

Thanks!

Comment 2 Zamundaaa 2026-06-29 19:02:51 UTC

I tested the profiles and afaict this is the same as bug 522301, and should be fixed by the same MR

*** This bug has been marked as a duplicate of bug 522301 ***