Bug 474364

Summary: dual monitors with one monitor scaled sometimes corrupts the non scaled
Product: [Plasma] plasmashell Reporter: Tom Englund <tomenglund26>
Component: Desktop icons & Folder View widgetAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: daninshed, hein, nate, xaver.hugl
Priority: NOR Keywords: multiscreen, wayland-only
Version First Reported In: 5.27.7   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Tom Englund 2023-09-10 11:25:22 UTC
SUMMARY
i have two monitors with 2560x1440 but since one is 15" and one 27" im scaling the 15" to 125% to get a relative readable font. but sometimes when either logging in or launching applications from the desktop icons the non scaled monitor flickers and somehow corrupts/changes like its trying to scale itself. screenshot https://i.imgur.com/fiwgri4.jpg , ignore the white bar on the left scaled monitor thats something spectacle adds. this can be "reverted" by simply disabling the non scaled monitor in system settings and enabling it again. sadly it doesnt happend always so its not all to easy to reproduce.


STEPS TO REPRODUCE
1. use dual monitors
2. scale one monitor
3. at random when logging in or launching applications from desktop icons it "flickers/rescales" the second monitor.

doesnt seem to occur when launching things from either konsole or alt + f2.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.5.2-arch1-1 (64-bit)
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
Comment 1 Tom Englund 2023-09-27 12:38:22 UTC
i have been backporting various commits and merge requests just for fun tinkering and hopes that i manage to get https://invent.kde.org/plasma/kwin/-/merge_requests/4177 built ontop of plasma5. now something like two thirds there and like 30 merge requests later. this has stopped happening so might be fixed in plasma 6/kwin master. the issue was not because of my tinkering, its occuring on the default kwin from repos.
Comment 2 Daniel Cleaver 2024-12-12 02:30:00 UTC
(In reply to Tom Englund from comment #0)

I have an issue that I believe is the same as yours. Two monitors, both 100% scale, but different resolutions. Right monitor is 2560x1440, left monitor is 1920x1080.

https://drive.google.com/file/d/1T2mxoXvcXV24PVpx1o_KmV48A8FBOE1k/view?usp=sharing
(the video is poor quality but downloading the file helps slightly)

It seems random, with the exception of one pattern I noticed: if I have a window maximized on the left monitor (1080p) and drag it down/right. However, I don't remember if this happened every time.

> this can be "reverted" by simply disabling the non scaled monitor in system settings and enabling it again.
I will try this next time it happens. I am able to revert it by logging out, but not by locking.

Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.0-28-amd64 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 6700 XT
Comment 3 Daniel Cleaver 2024-12-20 19:07:50 UTC
(In reply to daninshed from comment #2)
Can confirm that I can revert it by disabling my 1440p monitor. The glitch has happened twice since my previous comment and I was able to do this both times. Uncheck "Enabled", hit apply, monitor goes dark, hit revert, monitor comes back up and the glitch disappears.
Comment 4 Nate Graham 2025-05-28 20:08:11 UTC
Thanks for the bug report, and I'm sorry we weren't able to look into it yet! Are you able to reproduce the issue in Plasma 6.3.5 โ€” or even better, in the Plasma 6.4 beta? Or also the Plasma 6.4 final release, once it comes out in mid-June.

Thanks a lot!
Comment 5 Daniel Cleaver 2025-05-29 02:21:23 UTC
(In reply to Nate Graham from comment #4)
Hi Nate, I have not used those versions so I have to say no for now. I might distro hop and have the opportunity to reproduce it at some point though.

Also, since Tom has not chimed in, I am not sure whether my issue is actually a real duplicate. If it's not I apologize.
Comment 6 Nate Graham 2025-05-29 04:25:50 UTC
Cool, let's see what Tom has to say!
Comment 7 Bug Janitor Service 2025-06-13 03:48:08 UTC
๐Ÿ›๐Ÿงน โš ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 8 Daniel Cleaver 2025-06-13 15:08:22 UTC
(In reply to Bug Janitor Service from comment #7)
No objection. This bug is not actionable until someone (including me) reproduces it in the modern versions.

I remember seeing various flickering-type bugs getting fixed for Plasma 6 and this one kinda reminds me of them, so I wouldn't be surprised if it was already fixed.
Comment 9 Bug Janitor Service 2025-06-28 03:47:38 UTC
๐Ÿ›๐Ÿงน โš ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 10 Bug Janitor Service 2025-07-13 03:47:26 UTC
๐Ÿ›๐Ÿงน This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.