| Summary: | kwin freezes the desktop on hovering items in Icons Only Task Manager (X11 and Wayland) | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Waqar Ahmed <waqar.17a> |
| Component: | X11 Integration | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED WORKSFORME | ||
| Severity: | grave | CC: | kde, nate, nathroset |
| Priority: | NOR | ||
| Version First Reported In: | 6.1.5 | ||
| Target Milestone: | --- | ||
| Platform: | Manjaro | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: |
flamegraph
perfparser file kwin freezes when hovering previews disabling the second option makes the issue disappear new perfparser file |
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Created attachment 174569 [details]
perfparser file
perfparser file. It can be opened in kdab hotspot
Restarting kwin made it faster again: systemctl restart --user plasma-kwin_x11.service Are you really using Plasma 6.0.5? I would strongly recommend upgrading. Also, what distro are you using it on? I am now on 6.1.5. I am using Manjaro The bug still happens from time to time. Operating System: Manjaro Linux KDE Plasma Version: 6.1.5 KDE Frameworks Version: 6.6.0 Qt Version: 6.7.2 Kernel Version: 6.6.54-2-MANJARO (64-bit) Graphics Platform: X11 Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics Memory: 15.0 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: LENOVO Product Name: 81X2 System Version: IdeaPad Flex 5 14ARE05 Thanks. Does it happen in the Wayland session? I do not use Wayland so I am not sure. Can confirm its still happening as of: Operating System: Manjaro Linux KDE Plasma Version: 6.2.4 KDE Frameworks Version: 6.8.0 Qt Version: 6.8.1 Kernel Version: 6.6.65-1-MANJARO (64-bit) Graphics Platform: X11 Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics Memory: 15.0 GiB of RAM Graphics Processor: AMD Radeon Graphics Can you try on Wayland and see? I can try sometime, but I can't use wayland because it doesn't have autotype into windows functionality last I checked which I need for work, and thus I can't use it for longer periods of time which means hitting this bug will be a lot difficult. This bug happens once I have been using my laptop for a while. I am not sure how big a "while" is, but its at least a few hours. Also, I have attached profiling information so someone who knows the KWin code / task manager code can at least check the trace to see if something bad is going on like for e.g., accumulating too much data or doing the same work too many times etc. I can also reproduce this bug on the Wayland session, so this isn't X11 exclusive. The issue manifests itself over time to the point where my session becomes totally unresponsive and I'm forced to reset. Operating System: Kubuntu 24.10 KDE Plasma Version: 6.1.5 KDE Frameworks Version: 6.6.0 Qt Version: 6.6.2 Kernel Version: 6.11.0-9-generic (64-bit) Graphics Platform: Wayland Processors: 12 × AMD Ryzen 5 5600H with Radeon Graphics Memory: 31.2 Gio of RAM Graphics Processor: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 Manufacturer: LENOVO Product Name: 82JU System Version: Legion 5 15ACH6H Created attachment 178065 [details]
kwin freezes when hovering previews
I've captured what the bug looks like : the entire screen freezes when I hover a preview.
However the bug doesn't manifest itself when I disable the "Hide other windows when hovering the preview" option in Appearence > General
Created attachment 178066 [details]
disabling the second option makes the issue disappear
Disabling the second option in the appearance > general options does not trigger the bug, so use this as a workaround for now if you're affected.
Still an issue with plasma 6.3.5 (In reply to Waqar Ahmed from comment #12) > Still an issue with plasma 6.3.5 Can you please get kwin's backtrace when it's frozen? Otherwise I'm afraid the issue is not actionable. Also please check kwin's logs. Maybe there's something 🐛🧹 ⚠️ 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! > Can you please get kwin's backtrace when it's frozen? Otherwise I'm afraid the issue is not actionable
Did you take a look at the flamegraph? That has a sort of backtrace in it, Is there nothing actionable there?
I will take a look at the logs sure.
The perfparser file can be viewed in https://github.com/KDAB/hotspot/ Created attachment 184251 [details]
new perfparser file
Recorded a new trace, it can be viewed in KDAB Hotspot. The summary is that there are too many calls to QElapsedTimer::elapsed() for some reason.
#0 (42.4%) aggregated cycles:P costs in QElapsedTimer::elapsed() const (libQt6Core.so.6.9.1)
#1 (45.7%) aggregated cycles:P costs in KWin::AnimationEffect::updateLayerRepaints() (libkwin.so.6.3.6)
#2 (46.5%) aggregated cycles:P costs in KWin::AnimationEffect::triggerRepaint() (libkwin.so.6.3.6)
#3 (46.6%) aggregated cycles:P costs in KWin::AnimationEffect::p_animate(KWin::EffectWindow*, KWin::AnimationEffect::Attribute, unsigned int, int, KWin::FPx2, QEasingCurve const&, int, KWin::FPx2, bool, bool, bool, KWin::GLShader*) (libkwin.so.6.3.6)
kwin version is: kwin 6.3.6 There is nothing in journalctl, no logs from kwin when the slowness happens. Is there any other place that kwin logs? Hello, I can confirm this bug on my system as well. Here are my system details: - Operating System: Fedora Linux 41 - Kernel: 6.14.6-200.fc41.x86_64 - KDE Plasma Version: 6.3.5 - Graphics Platform: Wayland - GPU: Intel Meteor Lake-P [Intel Graphics] (driver: i915) - Computer: ThinkPad T16 Gen 3 The system consistently freezes for 2-3 seconds with kwin_wayland spiking to nearly 100% CPU. This happens when I hover over the application preview or tooltip popup that appears after hovering a task manager icon. I have found a workaround by disabling the informational tooltips in System Settings. The freezes no longer occur after making this change. Steps to reproduce: 1. Use the default KDE Task Manager on a Wayland session. 2. Hover over an application icon to make a popup appear. 3. Move the mouse cursor over the popup itself. 4. The system will freeze, and kwin_wayland CPU usage will spike. Workaround: Disable "Display informational tooltips on mouse over" in System Settings -> Workspace -> General Behavior. This confirms the bug is likely tied to the rendering of these specific UI elements. Hope this helps. Can you run bustle to see what dbus traffic looks like? Theory is that fast repaints triggered by highlightwindows effect through taskmanager which was enabled by default for a whole but disabled in 6.4.1 https://invent.kde.org/plasma/plasma-desktop/-/commit/5d0f0926846090e2f60d45f97f944f4d791f9198 Does it still happen with plasma 6.4.1 or later? (In reply to David Redondo from comment #21) > Theory is that fast repaints triggered by highlightwindows effect through > taskmanager > > which was enabled by default for a whole but disabled in 6.4.1 > https://invent.kde.org/plasma/plasma-desktop/-/commit/ > 5d0f0926846090e2f60d45f97f944f4d791f9198 > > Does it still happen with plasma 6.4.1 or later? Hello, I cannot reproduce the bug anymore on 6.4.5. Operating System: Arch Linux KDE Plasma Version: 6.4.5 KDE Frameworks Version: 6.18.0 Qt Version: 6.9.2 Kernel Version: 6.17.1-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 24 × AMD Ryzen AI 9 HX 370 w/ Radeon 890M Memory: 32 Gio of RAM (30.5 Gio usable) Graphics Processor: AMD Radeon 890M Graphics Manufacturer: ASUSTeK COMPUTER INC. Product Name: ASUS Zenbook S 16 UM5606WA_UM5606WA System Version: 1.0 |
Created attachment 174568 [details] flamegraph SUMMARY I have been noticing constant cpu spikes whenever I hovered over an icon in the task manager to see the contents of its window temporarily. Its so bad that it freezes the entire desktop for 5-10 seconds. I am attaching a perfparser file which can be opened in kdab/hotspot and also attaching a flamegraph svg.