Bug 508905

Summary: "Taskbar" Panel flickers during mouse-over when using multiple monitors with different refresh rates
Product: [Plasma] plasmashell Reporter: Michael <michaelmacks>
Component: Task Manager and Icons-Only Task Manager widgetsAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: minor CC: kdedev, qydwhotmail
Priority: NOR    
Version First Reported In: master   
Target Milestone: 1.0   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: attachment-3535631-0.html

Description Michael 2025-08-29 19:34:31 UTC
***
Apologies for some windows terminology, I am a transplant. 
When mousing the cursor over the "Taskbar" Panel (icons, and "system tray" icons), portions of the taskbar and mouseover notifications/info flicker when the user has multiple monitors with different refresh rates connected (2 in this case). The issue presents when two different refresh rates are selected, but does not present when the same refresh rate is selected between both monitors. 
***

SUMMARY


STEPS TO REPRODUCE
1. connect two monitors with different refresh rates selected (160hz & 144hz are what I noticed the issue on)
2. Mouse over the "Taskbar" panel 
3. 

OBSERVED RESULT
Taskbar flickers repeatedly

EXPECTED RESULT
Taskbar should not flicker

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
Linux/KDE Plasma: KDE Plasma Version: 6.4.4
KDE Plasma Version:  6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Wayland

ADDITIONAL INFORMATION
Kernel Version: 6.16.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 64 GiB of RAM (60.5 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 4070 -
NVRM version: NVIDIA UNIX Open Kernel Module for x86_64  575.64.05  Release Build  (dvs-builder@U22-A23-13-1)  Fri Jul 18 16:00:10 UTC 2025
GCC version:  gcc version 15.2.1 20250808 (Red Hat 15.2.1-1) (GCC)
Comment 1 TraceyC 2025-09-03 18:09:34 UTC
Thanks for the bug report. Unfortunately, this is an NVIDIA GPU issue, like virtually all the other weird random graphical glitches end up being.

Please report this issue to the NVIDIA folks, either by sending an email to linux-bugs@nvidia.com or making a post at https://forums.developer.nvidia.com/c/gpu-graphics/linux. It would be helpful to the NVIDIA developers if you could run nvidia-bug-report.sh and attach the resulting file in your report.

Thanks!
Comment 2 Michael 2025-09-04 21:33:03 UTC
Created attachment 184730 [details]
attachment-3535631-0.html

 Thank you for your reply, I will do just that! 
This was my first bug report, and I've recently signed up to volunteer for KDE support, so I'm looking for areas where I can be helpful. I come from a windows sysadmin background, but I daily drive fedora KDE on my personal device. Do you have any advice of where I could be the most useful, perhaps in user support?
Thanks!Michael
    On Wednesday, September 3, 2025 at 02:09:38 PM EDT, TraceyC <bugzilla_noreply@kde.org> wrote:  
 
 https://bugs.kde.org/show_bug.cgi?id=508905

TraceyC <kdedev@tlcnet.info> changed:

          What    |Removed                    |Added
----------------------------------------------------------------------------
            Status|REPORTED                    |RESOLVED
        Resolution|---                        |UPSTREAM
                CC|                            |kdedev@tlcnet.info

--- Comment #1 from TraceyC <kdedev@tlcnet.info> ---
Thanks for the bug report. Unfortunately, this is an NVIDIA GPU issue, like
virtually all the other weird random graphical glitches end up being.

Please report this issue to the NVIDIA folks, either by sending an email to
linux-bugs@nvidia.com or making a post at
https://forums.developer.nvidia.com/c/gpu-graphics/linux. It would be helpful
to the NVIDIA developers if you could run nvidia-bug-report.sh and attach the
resulting file in your report.

Thanks!
Comment 3 TraceyC 2025-09-11 08:54:06 UTC
(In reply to Michael from comment #2)
> This was my first bug report, and I've recently signed up to volunteer for
> KDE support, so I'm looking for areas where I can be helpful. I come from a
> windows sysadmin background, but I daily drive fedora KDE on my personal
> device. Do you have any advice of where I could be the most useful, perhaps
> in user support?
> Thanks!Michael

We always welcome new contributors. Thanks! Have a look here as a good starting point:
https://community.kde.org/Get_Involved

If you have other questions about getting started, feel free to ask in the KDE New Contributors room in Matrix. It's listed in that link as well.