https://bugs.kde.org/show_bug.cgi?id=466299
Bug ID: 466299
Summary: Window previews for task manager icons showed the
wrong colours when using the llvmpipe driver
Classification: Plasma
Product: plasmashell
Version: 5.27.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Task Manager and Icons-Only Task Manager
Assignee: plasma-b...@kde.org
Reporter: matt.fagn...@bell.net
Target Milestone: 1.0
Created attachment 156640
--> https://bugs.kde.org/attachment.cgi?id=156640&action=edit
Recording of wrong window preview colours in VM using llvmpipe
SUMMARY
I booted the Fedora 38 KDE Plasma live image
Fedora-KDE-Live-x86_64-38-20230221.n.1.iso in a QEMU/KVM VM using GNOME Boxes
with 3D acceleration disabled using the llvmpipe driver from
mesa-dri-drivers-23.0.0~rc4-3.fc38.x86_64.
Plasma 5.27.0 on Wayland started. I started Konsole, Firefox, Dolphin, System
Settings. I moved the mouse cursor over the icons in the task manager for those
programs. The window previews in the tooltips for those task manager icons
showed the wrong colours. For Konsole, the main part of the window preview was
shown as purple when it was really black. Purple, blue and other coloured
stripes were shown on the Firefox preview which weren't shown in Firefox. The
Dolphin preview had light blue on its left and top parts which were actually
grey. The right panel of System Settings' preview was blue when it was grey.
I'm attaching a recording which shows this problem.
This problem always seems to happen when using the llvmpipe driver. I booted
the same image on bare metal from a USB flash drive using Troubleshooting >
Start Fedora-38-KDE-Plasma in basic graphics mode in grub which uses the
llvmpipe mesa driver and simpledrm kernel driver. The same sort of incorrect
colours were shown for those programs' previews in the task manager using the
llvmpipe driver on bare metal. The problem didn't happen in VMs with 3D
acceleration enabled using the virgl mesa driver, and on bare metal using the
radeonsi mesa driver and virtio-gpu kernel driver. The problem might be
specific to llvmpipe.
STEPS TO REPRODUCE
1. Boot a Fedora 37 KDE Plasma installation updated to 2023-2-22 with
updates-testing enabled
2. Log in to Plasma 5.27.0 on Wayland from sddm
3. Download Fedora-KDE-Live-x86_64-38-20230221.n.1.iso from
https://koji.fedoraproject.org/koji/buildinfo?buildID=2157026
4. Install GNOME Boxes if it isn't already with sudo dnf install gnome-boxes
5. Start GNOME Boxes
6. boot the Fedora 38 KDE Plasma live image
Fedora-KDE-Live-x86_64-38-20230221.n.1.iso in a QEMU/KVM VM using GNOME Boxes
with 3D acceleration disabled using the llvmpipe driver
7. Start Konsole in the VM
8. Start Firefox in the VM
9. Start Dolphin in the VM
10. Start System Settings in the VM
11. Hover the cursor over the task manager icons for Konsole, Firefox, Dolphin,
and System Settings so that their small window previews are shown
OBSERVED RESULT
Window previews for task manager icons showed the wrong colours when using the
llvmpipe driver
EXPECTED RESULT
Window previews for task manager icons showed the correct colours when using
the llvmpipe driver
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 38
(available in About System)
KDE Plasma Version: 5.27.0
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
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