No Passthrough with DTS + Dolby-TrueHD on Zotac CI622

While connecting an Zotac CI622 (i7-10510U, Comet-Lake) connected to a Denon X3800H
with the current Generic-Build 11.0.4 playing Videos with DTS or Dolby-TrueHD fails via Passthrough
Everything else seems to run fine. Also HDR is working correctly.

So far i eleminated as cause the hdmi-cable or wrong settings like adjusting refresh rate.
Also the hardware itself should not be the problem, because everything works fine if i install a fresh Windows 11 23H2 and Kodi.
But because i dont want to use a Windows-System as Media-Player i like to use LibreElec or something similar
So far the latest provided Bios via Zotac-Page is installed.

From what i understand ALSA throws an Error while trying to use Passthrough:
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2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/confmisc.c:855:(parse_card) cannot find card '$CARD'
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5180:(_snd_config_evaluate) function snd_func_card_inum returned error: No such device
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/confmisc.c:422:(snd_func_concat) error evaluating strings
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5180:(_snd_config_evaluate) function snd_func_concat returned error: No such device
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/confmisc.c:1334:(snd_func_refer) error evaluating name
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5180:(_snd_config_evaluate) function snd_func_refer returned error: No such device
2024-01-09 16:23:42.991 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5703:(snd_config_expand) Evaluate error: No such device
2024-01-09 16:23:42.992 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5516:(parse_args) Unknown parameter CARD
2024-01-09 16:23:42.992 T:1052 info <general>: CAESinkALSA - ALSA: /build/build.LibreELEC-Generic.x86_64-11.0.4/build/alsa-lib-1.2.8/src/conf.c:5687:(snd_config_expand) Parse arguments error: No such file or directory
--

I provided the output of lspci, lsusb, dmesq and a kodi-logfile (debug-log activated)

I hope anyone can point me to a solution.

Nice Evening...

I played around a bit more with the Zotac CI622 and realized that Passthrough via DisplayPort works like intended.

So i compared the log-out while connected via HDMI(2.0 + 2.1) and via DP (1.4 -> HDMI2.0).
The log shows in both scenarios:

2024-01-13 15:23:08.152 T:936     debug <general>: CActiveAESink::OpenSink - trying to open device ALSA:hdmi:CARD=PCH,DEV=0
2024-01-13 15:23:08.153 T:936      info <general>: CAESinkALSA::Initialize - Attempting to open device "hdmi:CARD=PCH,DEV=0"
2024-01-13 15:23:08.155 T:936      info <general>: CAESinkALSA::Initialize - Opened device "hdmi:CARD=PCH,DEV=0,AES0=0x06,AES1=0x82,AES2=0x00,AES3=0x09"
2024-01-13 15:23:08.155 T:936     debug <general>: CAESinkALSA::InitializeHW - Request: periodSize 9600, bufferSize 38400
2024-01-13 15:23:08.169 T:936     debug <general>: CAESinkALSA::InitializeHW - Got: periodSize 9600, bufferSize 38400
2024-01-13 15:23:08.169 T:936     debug <general>: CAESinkALSA::InitializeHW - Setting timeout to 200 ms
2024-01-13 15:23:08.171 T:936     debug <general>: CAESinkALSA::GetChannelLayout - Input Channel Count: 8 Output Channel Count: 8
2024-01-13 15:23:08.171 T:936     debug <general>: CAESinkALSA::GetChannelLayout - Requested Layout: RAW, RAW, RAW, RAW, RAW, RAW, RAW, RAW
2024-01-13 15:23:08.171 T:936     debug <general>: CAESinkALSA::GetChannelLayout - Got Layout: RAW, RAW, RAW, RAW, RAW, RAW, RAW, RAW (ALSA: none)
2024-01-13 15:23:08.171 T:936     debug <general>: CActiveAESink::OpenSink - ALSA Initialized:
2024-01-13 15:23:08.171 T:936     debug <general>:   Output Device : HDA Intel PCH
2024-01-13 15:23:08.171 T:936     debug <general>:   Sample Rate   : 192000
2024-01-13 15:23:08.171 T:936     debug <general>:   Sample Format : AE_FMT_S16NE
2024-01-13 15:23:08.171 T:936     debug <general>:   Channel Count : 8
2024-01-13 15:23:08.171 T:936     debug <general>:   Channel Layout: RAW, RAW, RAW, RAW, RAW, RAW, RAW, RAW
2024-01-13 15:23:08.171 T:936     debug <general>:   Frames        : 9600
2024-01-13 15:23:08.171 T:936     debug <general>:   Frame Size    : 16

If i'm not wrong LibreElec does everything correct.
So i guess there is some kind of hardware-Limitation on the HDMI-Port of the CI622 that could be solved in Windows10+11 via the installed intel-driver but currently persists in Linux.

I tested so far that behavior also under Debian10+11 and Ubuntu 20.x and 22.x with the same result.

So i guess that Bug Report could be closed.

PS: Currently i only have tested cable with DP1.4->HDMI2.0 and thus got no HDR.
I guess i will get a DP1.4 -> HDMI2.1 adapter to see if i could use the CI622 as Mediaplayer with HDR+Atmos.