I'm having a problem with my i5-11400 which has a UHD 730.
I initially added the file:
options i915 force_probe=4c8b
# next line tested both on and off
# options i915 enable_guc=2
The Plex dockers (I've tried a few from the community tools, including the official one) will detect it and (hw) will appear on both lines of transcoding. The problem however is there are repeatable green and white "static" artifacts appearing on the right side of the screen, at the same points of a file. If I disable the second transcode option "Use hardware-accelerated video encoding" the static goes away (however half the transcode process is back to CPU).
I have since tried adding the recent Intel-GPU-Top community tool. Pulling up the intel_gpu_top command in the terminal while hw transcoding, none of the gpu graphs get anywhere near maxing out. I am not sure what google terms to search for to find a solution to this type of transcoding artifact. Are there any particular bios settings for the integrated graphics that should be set, initial buffer size, etc.?
For reference it is a 1080p 10.4 Mbps Plex reported bitrate being transcoded to 1080p 8 Mbps, through the plex.tv web viewer on windows chrome & firefox, and chrome on mac.