Thank you for your advice
There is no i GPU on my system. Only the RTX.
I rolled back to Plasma 6.0 using Timeshift but I would like to update to 6.1
I am not sure I want to do a clean install and I don’t have enough free time to search-and-discover what went wrong and how to solve it.
It is too pity I have to say I will wait for the next update… 