This thread is specific to Synology NAS with Gemini Lake and Apollo Lake CPUs. Due to Intel driver issues, Plex had to make transcoder modifications specifically for these CPUs in Synology NAS (which run Linux kernel 4.4 and have compatibility problems with current Intel drivers.).
While there are issues with Intel ARC GPUs and PMS on Linux, they are separate from what is discussed on this thread.
For Intel ARC GPUs on Linux systems, see Intel Arc GPU transcoding - discussion .
I’m not trying to be harsh, a jerk, etc. However, it helps to keep each thread focused on the original problem. Introducing off topic comments (which I am guilty of myself), can lead to confusion, misunderstandings, and frustration, as people may spend time on a solution that does not apply to their situation.