Running plex in an Ubuntu 21.10 LXC on a NUC11i7 (TigerLake w/ Intel Iris Xe), and I believe I managed to pass through the iGPU successfully and installed intel-media-va-driver-non-free and have had some success, but like Neo said I can't get it to use hw transcoding if HDR tone mapping is enabled. Has anyone figured out what a solution to this could be, perhaps a missing driver?