Bug 454973

Summary:	High dpi being ignored after changing accent color
Product:	[Applications] systemsettings	Reporter:	Marcelo <marcelovbcfilho>
Component:	kcm_colors	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	jpwhiting, mwoehlke.floss, nate, tantalising007
Priority:	NOR
Version First Reported In:	5.24.5
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
URL:	https://youtu.be/z6IP20_oSRI
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Youtube video showing the problem

Description Marcelo 2022-06-07 12:39:24 UTC

SUMMARY
On XORG, using a high dpi monitor (4k) and setting the scale to any value different than 100%, after changing some appearance option the dpi is reset to 100% for all new opened applications. Already open windows keep right scaling.


STEPS TO REPRODUCE
1. Have a 4k monitor
2. Run a session using Xorg
3. Change the scaling to 200%
4. Log out and in to apply scalling
5. Open any window, it will appear with the right scaling
6. Open system settings
7. Change the color between of the predefined colors
8. Open any window and the dpi will appear as if it was set to 100% again

OBSERVED RESULT
After changing color settings, new windows appear with default 100% scaling even with scaling still registering on settings as 200%.

EXPECTED RESULT
After changing color settings, new windows should keep their defined scaling of 200%.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 36
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
Uploaded a video demonstrating the problem and my system information.

Comment 1 Marcelo 2022-06-07 12:46:54 UTC

I uploaded a video showing the bug on youtube, to better explain the issue.
https://youtu.be/z6IP20_oSRI

Comment 2 Marcelo 2022-06-07 12:47:36 UTC

Created attachment 149529 [details]
Youtube video showing the problem

Comment 3 Nate Graham 2022-06-07 17:31:58 UTC

That is exceptionally strange. Probably what happens is that changing the accent color signals some change that gets handled by something else which resets the internal DPI value or something.

Cannot reproduce on Wayland or X11 FWIW.

Comment 4 Marcelo 2022-06-09 18:36:35 UTC

Yes, as you said apparently some program as messing with the system scaling, I installed Kde Neon on my pen drive, run on my computer and the bug didn't happen, sorry for the non bug report.