I have done the test and downloaded all the logs. I have also taken the captures of what happens when you choose different options in the client. I have notice if i choose convert automatically in plex the transcoder uses the GPU. If i choose anything else the transcoder dies and it doesn’t use the GPU and the video just buffers. Sorry i am not using P2000 but the K2200 also does the same thing as P2000. My P2000 is in another server and currently running.
I hope this helps and if you need anything else please reach out.
