@matthe6038 I used the official Plex image in this case to keep things simple here.
I did see some people have issues with HW acceleration and the Linuxserver images in the past though.
Thanks again for getting on this @ChuckPa. This is what shows up in my logs on startup (both using official Plex docker images):
Plex 1.29.0.6244 ā HW tonemapping does work 
Feb 23, 2023 16:43:13.185 [0x7ff42bdffb38] WARN - [GPU] Failed to load PCIID map: Failed to locate a readable PCIID database
Feb 23, 2023 16:43:13.185 [0x7ff42bdffb38] DEBUG - [GPU] Got device: , intel@builtin, default true, best true, ID /dev/dri/renderD128, DevID [8086:3184:1028:080c], flags 0xce
Feb 23, 2023 16:43:13.185 [0x7ff42bdffb38] INFO - Preemptively preparing driver icr for GPU
(Iām not sure why the colors in the formatting below are different)
Plex 1.31.2.6715 (updated inside the container) ā HW tonemapping doesnāt work 
Feb 23, 2023 16:48:05.889 [0x7facb73ffb38] DEBUG - [GPU] Got device: GeminiLake [UHD Graphics 605], intel@builtin, default true, best true, ID /dev/dri/renderD128, DevID [8086:3184:1028:080c], flags 0x67
Feb 23, 2023 16:48:05.889 [0x7facb73ffb38] INFO - Preemptively preparing driver icr for GPU GeminiLake [UHD Graphics 605]
Interestingly, the earlier working version doesnāt appear to actually detect the specific GPU model. But there is a difference, which is something I hope.
Let me know if there is anything else I can look at or test.
Adding:
My system reports the GPU as
VGA compatible controller: Intel Corporation GeminiLake [UHD Graphics 605] (rev 03) (prog-if 00 [VGA controller])
The KabyLake (i3-7300U) system you mentioned appears to have the same Quick Sync features according to this.