SUMMARY The entire desktop stutters when a notification appears (and when it disappears). Video: https://youtu.be/V_DPYOPAvCE Seems to only happen with the Nvidia driver. STEPS TO REPRODUCE 1. Open glxgears or similar, it can help to use mangohud to make the stutter more visible (it shows a performance graph). 2. Open Konsole and run: while true; do notify-send -t 2000 test; sleep 2; done in the shell. This will spam some notifications for you. 3. Move some windows around OBSERVED RESULT glxgears stutters, and so does the entire desktop (moving windows). EXPECTED RESULT Nothing special happens, no stutter. SOFTWARE/OS VERSIONS Operating System: Debian GNU/Linux 11 (Sid) KDE Plasma Version: 5.21.5 KDE Frameworks Version: 5.81.0 Qt Version: 5.15.2 Kernel Version: 5.11.0-19.1-liquorix-amd64 OS Type: 64-bit Graphics Platform: X11 Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz Memory: 7.7 GiB of RAM Graphics Processor: GeForce GTX 660/PCIe/SSE2 (MSI GeForce GTX660 TWINFROZR III) Nvidia Driver Version: 460.73.01 ADDITIONAL INFORMATION I can't reproduce it on a Thinkpad x240 that has an Intel iGPU, but it is the case on my PC with Nvidia GTX 660. It's irritating while playing games and noticeable while just using the desktop. There also is some stutter when opening/closing windows, but I don't know if this is related, and it isn't that extreme.
Almost certainly an issue with the Nvidia driver itself. Please report this issue to the Nvidia folks, either by sending an email to linux-bugs@nvidia.com or making a post at https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/ It would be helpful to the Nvidia developers if you could run nvidia-bug-report.sh and attach the resulting file in your report. Thanks!
(In reply to Nate Graham from comment #1) > Almost certainly an issue with the Nvidia driver itself. Please report this > issue to the Nvidia folks, either by sending an email to > linux-bugs@nvidia.com or making a post at > https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/ > > It would be helpful to the Nvidia developers if you could run > nvidia-bug-report.sh and attach the resulting file in your report. Thanks! I reported this on the Nvidia developers forum, as sugested: https://forums.developer.nvidia.com/t/desktop-notifications-cause-stutter-on-kde-plasma-5-21-5/177717/7 Multiple people confirmed the issue on completely different setups. It has been almost 2 years - no official response. Moreover, during this period Nvidia stopped updating drivers for older (but still perfectly good) cards, including mine. Could KDE take another look into this? Free software projects working around bugs not caused by them, but impacting their users, isn't that unusual. If it's possible, it would be appreciated. (Anyways, not buying Nvidia ever again and hoping GPU prices go down so I can buy a decent Radeon).
If the issue is in the proprietary nvidia driver, there's nothing actionable from our side. Also, I haven't heard of any workarounds.
(In reply to Grzesiek11 from comment #2) > (Anyways, not buying Nvidia ever again and hoping GPU prices go down so I > can buy a decent Radeon). FWIW I bought this recently: https://www.newegg.com/asrock-radeon-rx-6600-xt-rx6600xt-cld-8g/p/N82E16814930063?Item=N82E16814930063 $290 ain't bad for what it is.