OpenCL implementation causing GPU hangs 6.11 and 6.12 on Gemini Lake CPU architecture during Plex HW-Accelerated HDR Tone Mapping

Hi,

In Unraid versions 6.11 (kernel 5.19.17) and 6.12 (6.1.x) on the Gemini Lake CPU architecture, a faulty OpenCL implementation is leading to GPU hangs when Plex attempts hardware-accelerated HDR tone mapping. It's important to note that Plex has verified that the issue is related to Unraid or the kernel's implementation. In contrast, in Unraid version 6.10.3 (kernel 5.15), HW-accelerated HDR tone mapping works without any issues in Plex. 

This problem has been acknowledged by Plex as stemming from Unraid's implementation or the kernel 5.19.17+. Normal SDR transcoding works perfectly on all versions of Unraid.

Oct 25 21:59:27 UNRAID kernel: i915 0000:00:02.0: [drm] Resetting rcs0 for preemption time out
Oct 25 21:59:27 UNRAID kernel: i915 0000:00:02.0: [drm] Plex Transcoder[32177] context reset due to GPU hang
Oct 25 21:59:27 UNRAID kernel: i915 0000:00:02.0: [drm] GPU HANG: ecode 9:1:e757fefe, in Plex Transcoder [32177]

See the older logs (v6.11.5)

unraid-diagnostics-20230807-2045 2.zip

Thank you!