Created attachment 141505 [details] example of an empty/transparent firefox window I have noticed lately that on resume, if I have firefox maximized that it will resume with only the title bar and the actual window is completely transparent. I have attached a screen shot. In this instance, the Firefox window on my other (primary) monitor (with a panel) was fine and rendered its content correctly. Usually resizing/wiggling the window "fixes it". This time I just left it there after the screen shot, and, while filling this out it eventually painted itself. However, it also unpainted itself and repaints kind of randomly (at times now, the upper right quadrant had painted content, and the rest of the window flashed transparent. I have also noticed that the new hover preview is really messed up after resume, too, mainly around firefox. Going over previews really seems to trigger things and causes Firefox to flash/go transparent. SOFTWARE/OS VERSIONS Arch Linux (available in About System) KDE Plasma Version: 5.22.5 KDE Frameworks Version: 5.86.0 Qt Version: Qt 5.15.2 (built against 5.15.2) NVIDIA: 470.63.01 X11 ADDITIONAL INFORMATION
What graphics hardware are you using?
I can definitely reproduce it on my rtx 2080 super. I am not sure if I'm seeing it on my and 5500x or my Optimus laptop with Intel as primary.
I can also reproduce on amdgpu, and it's only reproducible on X11, not Wayland.
I have the same problem with Intel drivers too with Kubuntu 20.04 - 21.10, and earlier versions was affected too.
Can confirm on Kubuntu 21.10 with Intel 620 and nVidia proprietary. It is quite annoying and I have to try all sorts of things to make it work. Maximize/Restore/Minimize not always work.
Hello, cannot reproduce, maybe driver update fix the problem? INFO : Operating System: Fedora Linux 35 KDE Plasma Version: 5.23.4 KDE Frameworks Version: 5.89.0 Qt Version: 5.15.2 Kernel Version: 5.15.12-200.fc35.x86_64 (64-bit) Graphics Platform: X11 Processors: 12 × AMD Ryzen 5 2600 Six-Core Processor Memory: 15.6 Gio of RAM Graphics Processor: NVIDIA GeForce GTX 1660/PCIe/SSE2 NVIDIA: 495.46 X11
It only happens from time to time. Not every time.
A stable way to reproduce the bug: 1. Open 2 Firefox windows, and maximize only one of them. 2. Restart Firefox in about:profiles from the maximized window.
I debugged this issue some time ago. Based on geometry info in xwininfo, firefox has good window geometry. Furthermore, the task manager shows the same as what kwin shows. This looks like a Firefox bug.