[SOLVED]50 %+ CPU-load while watching vids since NV-driver-update

[Fred-VIE]

I suddenly get 50 % + CPU-Load and stuttering vids when playing Netflix (Vivaldi browser). Before the latest NV driver update it was around 10 to 15 %. But when I check the driver-manager I cannot get any earlier driver version, only an untested 545 (which gives more error-messages than the nouveau driver on install) and the same version open source one which does not make a difference.

When trying to install the nouveau driver the driver-manager says that several dependencies are missing but it's not going to install them (See dependencies screenshot, the 545 driver gives the same error like the nouveau driver but one additionally at the end an exit status error).

It feels like since the latest NV-driver the GPU does not process the vid anymore thus the CPU has to do it. But after checking the hardware acceleration that does not seem to be the case.

Graphics Feature Status
=======================

* Canvas: Hardware accelerated
* Canvas out-of-process rasterization: Enabled
* Direct Rendering Display Compositor: Disabled
* Compositing: Hardware accelerated
* Multiple Raster Threads: Enabled
* OpenGL: Enabled
* Rasterization: Hardware accelerated
* Raw Draw: Disabled
* Skia Graphite: Disabled
* Video Decode: Hardware accelerated
* Video Encode: Software only. Hardware acceleration disabled
* Vulkan: Disabled
* WebGL: Hardware accelerated
* WebGL2: Hardware accelerated
* WebGPU: Disabled
* WebNN: Disabled​

How can I find the earlier tested version of the NV-driver, that did not cause the high CPU-load?

This is from the previous version, since I cant start the latest one. I just changed the kernel version:

Operating System: Kubuntu 22.04
KDE Plasma Version: 5.24.7
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.15.0-112-generic (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-9700K CPU @ 3.60GHz
Memory: 15,5 GiB of RAM
Graphics Processor: llvmpipe

Vivaldi: 6.8.3381.44 (Stable channel) stable (64-bit)

Revision: 8b93eedecfc2569c0a293c88a83a5c15eab23945
JavaScript: V8 12.6.228.19
User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Command Line: /usr/bin/vivaldi-stable --flag-switches-begin --ignore-gpu-blocklist --flag-switches-end --disable-smooth-scrolling --save-page-as-mhtml
Executable Path: /opt/vivaldi/vivaldi
Profile Path: /home/fred/.config/vivaldi/Default
Variations Seed Type: Nul

[Fred-VIE]

Fixed it myself: I installed another driver, which did not work at all, then installed the latest driver again. After that cpu load was normal again.

[Snowhog]

How are you installing packages?

[Fred-VIE]

Sorrry I wasnt online for some time.
I installed the driver package via the driver manager that came with Kubuntu.
Basically I marked the driver I wanted and klicked "apply changes" then I logged out and in because I thought that was enough to install the driver. That probably was the root of the problem, I should have restarted.