SUMMARY Running java apps in Plasma Wayland / X-Wayland leads to massive flickering of the Java apps or even QT apps. STEPS TO REPRODUCE 1. Take Mediathekview and run it. Do several actions like Blacklisting of films. After blacklisting a few films, you most probably will get massive flickering. 2. Take a look at https://forums.developer.nvidia.com/t/wayland-massive-flickering-on-xwayland-java/215224 and https://gitlab.freedesktop.org/xorg/xserver/-/issues/1317 (search for "nvidia user01"). You can find an example here: https://magentacloud.de/s/LybHRSF4YjD9brs 3. OBSERVED RESULT Massive flickering after some time of operation (maybe 2 minutes). EXPECTED RESULT No flickering at all. Just as it works in Wayland gnome shell. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.15.32 / 5.24.5 KDE Frameworks Version: 5.94.0 Qt Version: 5.15.2 Nvidia: 515.43.04 and previous versions
I am noticing the same problem using JabRef, both with openjdk and jdk. The black flickering is so extreme that it covers almost the entire window at a high frequency, making the software completely unusable. Only Java programs running through XWayland are affected, running the same software through X11 works fine. Running the same software using another GPU vendor works without issues. Not sure if this is an Nvidia or KDE bug. OS: Arch Linux x86_64 Kernel: 5.18.9-zen1-1-zen DE: Plasma 5.25.2 (kwin) GPU: NVIDIA GeForce RTX 2060 Rev. A $ lspci -vks 01:00.0 01:00.0 VGA compatible controller: NVIDIA Corporation TU106 [GeForce RTX 2060 Rev. A] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Gigabyte Technology Co., Ltd Device 37d9 Flags: bus master, fast devsel, latency 0, IRQ 130, IOMMU group 1 Memory at f6000000 (32-bit, non-prefetchable) [size=16M] Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f0000000 (64-bit, prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at 000c0000 [virtual] [disabled] [size=128K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Legacy Endpoint, MSI 00 Capabilities: [100] Virtual Channel Capabilities: [250] Latency Tolerance Reporting Capabilities: [258] L1 PM Substates Capabilities: [128] Power Budgeting <?> Capabilities: [420] Advanced Error Reporting Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Capabilities: [900] Secondary PCI Express Capabilities: [bb0] Physical Resizable BAR Kernel driver in use: nvidia Kernel modules: nouveau, nvidia_drm, nvidia $ cat /proc/cmdline initrd=\intel-ucode.img initrd=\initramfs-linux-zen.img [...] intel_iommu=on iommu=pt nvidia-drm.modeset=1 rw nowatchdog
There's some known sync problems with Nvidia proprietary driver. Kwin can't do anything about it.