(In reply to 247 from comment #10)
> Created attachment 132816 [details]
> vainfo
> 
> just attached the vainfo result...

Please also attach the output when running vainfo in fedora36-cinnamon.

> the gst command instead results in a
> syntax error...just in case there are no errors in mesa, maybe a hint where
> i could look for help?

What was the syntax error ?

> 
> just in case : updated to latests gstreamer/mesa/kernel but that didn't
> solve my problem, and i tried a fresh installation with fedora 26 cinnamon
> and it's perfectly working, but i don't know if it count since i have
> problems in a gnome environment...

What is the difference between fedora26-cinnamon(OK) and fedora26-gnome(KO) ?
(x11 vs wayland ?)