SUMMARY Using a high quality / large sized image (for reference, I was using this image: https://unsplash.com/photos/galaxy-digital-wallpaper-rCbdp8VCYhQ) as a skybox on the Cube effect seems to make the effect unstable, make the screen go black, distort and cause some other freaky visual glitches, including not render on both monitors if a second display is connected. Even if you recover back to desktop from a broken Cube effect being used, this seems to also break some other desktop effects (most notably Overview) resulting in the screen going black and distorting until clicked back onto the desktop. This can result in a full system lockup, and in some cases, Cube can render correctly but will delay a decent amount of seconds before appearing, in this delay, the screen goes black till Cube correctly appears. STEPS TO REPRODUCE 1. Enable and configure Cube to use a large sized image as a Skybox on weaker hardware 2. press Meta+C OBSERVED RESULT Various visual glitches are caused by Cube leading either to a system lockup or if recovered from, causing most desktop effects to make the screen black out until the session is restarted. EXPECTED RESULT Cube either renders correctly with no / little delay or warns the user that the effect may be unstable with the image provided for the skybox. (maybe entirely prevents the image and falls back to a plain colour?) SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora Linux 40 KDE Plasma PreRelease (available in About System) KDE Plasma Version: 6.0.1 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 ADDITIONAL INFORMATION Additional Hardware Information for "older / lower end hardware": Graphics Platform: Wayland Processors: 4 × Intel® Core™ i5-6267U CPU @ 2.90GHz Memory: 7.6 GiB of RAM Graphics Processor: Mesa Intel® Iris® Graphics 550 Manufacturer: Apple Inc. Product Name: MacBookPro13,2 System Version: 1.0
https://youtu.be/pc2_gMYasjs video of the bug, playing back the screen recording on VLC caused it to hang a fair few amount of times midplayback which was.... unique to say the least
I have newer hardware than OP and I also notice this but It's not as severe as the video. The Cube only takes some time to open while everything else freezes. For 1080p images, it takes around 0.5s to open, ~1s for 1440p images 1.5-2s for 2160p images, etc. ADDITIONAL INFORMATION: Operating System: Arch Linux KDE Plasma Version: 6.1.3 KDE Frameworks Version: 6.4.0 Qt Version: 6.7.2 Kernel Version: 6.9.10-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 5800H with Radeon Graphics Memory: 15.0 GiB of RAM Graphics Processor: AMD Radeon Graphics