Bug 446617

Summary:	External monitor always goes to automatic rgb range.
Product:	[Plasma] KScreen	Reporter:	arun <lunar.arun>
Component:	common	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	nate, xaver.hugl
Priority:	NOR
Version:	5.23.4
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:	5.24
Sentry Crash Report:

Description arun 2021-12-07 12:09:47 UTC

SUMMARY

Colors are always washed out on reboot. I have to set RGB range to full on every login.



STEPS TO REPRODUCE
1. Install and use GDM instead of SDDM. GDM already runs on full range color. I have added 
`ExecStartPre=/usr/bin/proptest -M i915 -D /dev/dri/card0 103 connector 98 1` 
on gdm system service.
2. Login to plasma session.

OBSERVED RESULT
The preference full range should stick on every reboot. It goes to automatic range which is not correct resulting in washed out colors.


SOFTWARE/OS VERSIONS:

KDE Plasma Version: 5.23.4

Comment 1 arun 2021-12-07 17:17:04 UTC

update: It happens when using on SDDM too. it's not specific to gdm.

Comment 2 Nate Graham 2021-12-07 21:22:42 UTC

Thankfully this should be fixed in Plasma 5.24 where there is official support for this in KScreen.

Comment 3 Zamundaaa 2021-12-07 22:02:17 UTC

Support has been added in 5.23, this is a dup of 442520 (/of the latest issue reported in that bug report). I'll try to reproduce it again...

*** This bug has been marked as a duplicate of bug 442520 ***

Comment 4 arun 2021-12-08 02:44:29 UTC

The bug  https://bugs.kde.org/show_bug.cgi?id=442520 description mentions it fails apply full rgb range. For me it applies rgb range but it doesn't work on re-login.

Comment 5 Zamundaaa 2021-12-08 12:03:34 UTC

Read the newer comments, it's the same issue. Applying works, but it resets on logout/login somehow.