SUMMARY On a VM, Plasma 6 flickers a lot on a Wayland session. X11 is fine. The cursor is also invisible. The video below illustrates the issue: https://www.youtube.com/watch?v=QjVXg1KtpR4 I'm using Gnome Boxes with a Linux host, however, the same is true on Virtual Box on Windows. STEPS TO REPRODUCE 1. Launch a Plasma 6 Wayland session on a virtual machine OBSERVED RESULT The mouse cursor is invisible and the whole image flickers EXPECTED RESULT No flickering SOFTWARE/OS VERSIONS KDE Plasma Version: 5.27.80 KDE Frameworks Version: 5.240.0 Qt Version: 6.5.1 ADDITIONAL INFORMATION Neon Unstable July 6th 2023.
I don't know about the cursor, but the flickering is caused by https://gitlab.freedesktop.org/mesa/mesa/-/issues/9375. https://invent.kde.org/plasma/kwin/-/merge_requests/4249 should fix it
New info. I tested now with Virtualbox instead of Gnome Boxes, and there's no flickering, however, the cursor is still invisible, and all the timing of the animations is also broken. Likely a bunch of bugs. If necessary I can create separate bug reports for those.
Virtualbox probably sets up some sort of OpenGl acceleration by default, which will circumvent the Mesa bug. For the cursor, see bug 474298
Hello, I tested the `neon-developer-20230907-1341.iso` live iso in libvirt QEMU/KVM with Virtio graphics and I noticed extreme flickering, but the cursor is visible.
I tried VIrtualBOx + Plasma Wayland on neon-unstable-20231001-1120, after doing 'apt udpate && apt dist-upgrade', and the Wayland session did not even start. After several flickers between VirtualBox screen sizes, it went back to the SDDM login screen. Syslog showed segfaults.
That's a different bug, please make a separate report for that. For the actual bug with flickering, we've included a workaround with https://invent.kde.org/plasma/kwin/-/commit/f43e45c984382a7f02c4b9a8cf4c8c1019ad193b