https://bugs.kde.org/show_bug.cgi?id=491561
Bug ID: 491561
Summary: Window previews were corrupted when using the llvmpipe
driver
Classification: Plasma
Product: kwin
Version: 6.1.3
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Keywords: qt6
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: matt.fagn...@bell.net
Target Milestone: ---
Created attachment 172497
--> https://bugs.kde.org/attachment.cgi?id=172497&action=edit
recording of the problem for the Firefox and Konsole window previews
SUMMARY
I booted the Fedora Rawhide KDE live image
Fedora-KDE-Live-x86_64-Rawhide-20240810.n.0.iso in a QEMU/KVM VM in GNOME Boxes
with 3D acceleration disabled using the llvmpipe driver from mesa 24.2.0-rc4
and virtio-gpu 6.11-rc2 kernel driver in a Fedora 40 KDE installation. Plasma
6.1.3 on Wayland started. I started Konsole, Firefox, and other programs. When
I hovered over the Konsole, Firefox and other icons in the task manager, the
window previews were corrupted with black areas and/or horizontal lines as
different previews were shown. The window previews also looked blurry and the
text in them was illegible. I'm attaching a recording of the problem for the
Firefox and Konsole window previews.
I reproduced this problem with the same image on bare metal in basic graphics
mode using nomodeset on the kernel command line using the llvmpipe driver and
simpledrm kernel driver. The problem didn't happen in a VM with 3D acceleration
enabled using the virgl driver and virtio-gpu kernel driver or on bare metal
with the radeonsi mesa driver and amdgpu kernel driver. The problem might be
specific to llvmpipe.
STEPS TO REPRODUCE
1. Download the Fedora Rawhide KDE live image
Fedora-KDE-Live-x86_64-Rawhide-20240810.n.0.iso from
https://koji.fedoraproject.org/koji/buildinfo?buildID=2524587
2. install GNOME Boxes in a Fedora 40 KDE installation if it isn't already with
sudo dnf install gnome-boxes
3. Boot Fedora-KDE-Live-x86_64-Rawhide-20240810.n.0.iso in a QEMU/KVM VM in
GNOME Boxes with 3D acceleration disabled
4. Start Konsole and Firefox in Plasma 6.1.3 in the VM
5. Hover over and off Konsole and Firefox's icons in the task manager until
their window previews are shown repeatedly until the problem happens
OBSERVED RESULT
Window previews were corrupted when using the llvmpipe driver
EXPECTED RESULT
Window previews should've been shown normally when using the llvmpipe driver
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Rawhide/41
(available in About System)
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
The plasmashell crashes which sometimes happened when showing window previews
with Plasma 6.1.3 and mesa 24.1.4 I reported at
https://bugs.kde.org/show_bug.cgi?id=490844 didn't happen with Plasma 6.1.3 and
mesa 24.2.0-rc4 in Fedora-KDE-Live-x86_64-Rawhide-20240810.n.0.iso.
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