Suddenly can't play 4k content

[skribe]

With your transcode settings ffmpeg does not use HWA
-codec:v:0 libx264 <-- that is a software transcode.
Why exactly that is, i am not sure however. Best quess would be a missing driver/low power encoding issue

I don't think you're looking at the right log. He has enabled QSV in the most recent log.

Code:

Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_qsv))
  Stream #0:1 -> #0:1 (eac3 (native) -> aac (libfdk_aac))

https://pastebin.com/K1FeJyHF