SUMMARY Sometimes my mouse cursor starts to move very slow and flinch, I'm now sure how to reproduce since this happens at random, I think it happens about 1 time per hour for 10 or 20 seconds and every time this happens I find the log below on journalctl set 15 02:26:35 user kwin_x11[727]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 50694, resource id: 16941108, major code: 14 (GetGeometry), minor code: 0 set 15 02:26:35 user kwin_x11[727]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 50693, resource id: 16941108, major code: 3 (GetWindowAttributes), minor code: 0 set 15 02:26:35 user kwin_x11[727]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 50690, resource id: 16941108, major code: 14 (GetGeometry), minor code: 0 set 15 02:26:35 user kwin_x11[727]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 50689, resource id: 16941108, major code: 3 (GetWindowAttributes), minor code: 0 SOFTWARE/OS VERSIONS Operating System: Manjaro Linux KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.97.0 Qt Version: 5.15.5 Kernel Version: 5.15.65-1-MANJARO (64-bit) Graphics Platform: X11 Processors: 12 × AMD Ryzen 5 3600 6-Core Processor Memory: 31,3 GiB of RAM Graphics Processor: NVIDIA GeForce GTX 1660 SUPER/PCIe/SSE2 I will try to downgrade to check if I'm able to reproduce this in older versions.
Some info I forgot to mention, I'm using 2 monitors with different refresh rates and I'm using this workaround https://bugs.kde.org/show_bug.cgi?id=433094#c15
On X11, the cursor is entirely governed by the X server, which means the problem is there, not in KWin.