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Wow, VP9 decoding on a 4th gen core i5 iGPU and no stuttering at 1080p is seriously impressive! Makes me wonder why this isn't the default driver...
Any chance of getting this as a pre-compiled package to ship with Deepin?
Lot of people use older Notebooks with Skylake architecture. This architecture GPU is not suppport modern codecs default (for example VP9 that use Youtube) but able to decode it a special driver named Intel Hybrid Driver. It not a standalone package, it need to install beside the normal driver.
On Debian (and Deepin) i not found this package, so now need to compile it from source. I would like to add some progress how to do it your own.
Update 1 - 2023.01.13
Update your system to latesest version (V20.8 now)
Compile this modules
intel-hybrid-driver (i use a fork, not the Intel repo, because it contain a fix that need, that you use libva 2.0+)
Add environment variables this file: /etc/environment
Reboot the system and test it!
vainfo (my Notebook is Haswell):
And check a youtube video with 1440p resolution, VP9 codec! Not bad a 10 years old architekture :)
Test machine - Intel Haswell CPU (i5-4300U) with Intel HD Graphics 4400
Youtube VP9 1080p - no frame drop
Youtube VP9 1440p - no frame drop
Youtube VP9 2160p - medium frame drop
Youtube VP9 1080p60 - low-medium frame drop
Youtube VP9 1440p60 - high frame drop
Youtube VP9 2160p60 - very high frame drop