Taskbar hover previews not showing on Plasma 6.6.5

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1

Hey everyone, I’m on Fedora 44 with Plasma 6.6.5 running a Wayland session on an NVIDIA RTX 4070 Laptop GPU (discrete-only mode, proprietary drivers via RPM Fusion). When I hover over an icon on the Icons-Only Task Manager with multiple windows open, nothing appears — no preview popup, no tooltip, nothing.

Here’s what I’ve confirmed and tried so far:

Settings checked:

- “Show small window previews when hovering over tasks” is enabled in the Task Manager widget settings

- “Thumbnail Aside” is enabled in Desktop Effects

- Qt Quick renderer is not set to software in ~/.config/kdeglobals (the QtQuickRendererSettings section doesn’t exist)

Fixes attempted (all followed by a reboot):

- Cleared the KWin cache (`rm -rf ~/.cache/kwin`)

- Reinstalled kpipewire (`sudo dnf reinstall kpipewire`)

- These were based on KDE bug 504887 which describes the same symptoms

Nothing has worked so far.

System info:

- Fedora 44

- Plasma 6.6.5 / KDE Frameworks 6.23.0 / Qt 6.10.2

- Kernel 6.18.16

- NVIDIA RTX 4070 Laptop, proprietary drivers (RPM Fusion)

- Wayland session

- Lenovo Legion Pro 5 16IRX8

Has anyone else run into this on a similar setup? Any ideas on what else to check or try would be really appreciated. Thanks!

2

Here is working.
Videocaptura de pantalla20260520120510

Operating System: openSUSE Tumbleweed 20260516
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Qt Version: 6.11.0
Kernel Version: 6.19.12-1-default (64-bit)
Graphics Platform: Wayland
Processors: 14 × Intel® Core™ Ultra 5 245K
Memory: 32 GiB of RAM (30.9 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 5070/PCIe/SSE2

I am using 595.71.05 .run driver.

You can try to make a new user to see if happens too.

Regards

3

What happens with Icons-and-Text Task Manager?
Also check what you see under X11 for S&Gs.
I switched to Icons-Only Task Manager and it works for me.

Operating System: openSUSE Tumbleweed 20260516
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Qt Version: 6.11.0
Kernel Version: 7.0.7-1-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5825U with Radeon Graphics
Memory: 64 GiB of RAM (62.1 GiB usable)
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP ProBook 455 15.6 inch G9 Notebook PC

previewsScreenshot20260520061722
previewsScreenshot202605200617225090×378 435 KB

4

Just changed user and ran wayland with no issues.

Screenshot20260520062340
Screenshot202605200623401920×880 186 KB