Intel Alder Lake 2160p @ 23.976 Hz passthrough HD Audio dropouts (i7-1270p/N100)

    Quick test yesterday evening, I thought I could test display port, I got my DP to HDMI cable and plugged it into the AVR (Denon 4700H) and lo and behold, no more audio dropouts within 15 minutes!? I'll test more this evening and report back! The motherboard is Asus N100I-D-D4 and I'm on 12.0.1, use passthrough and 23,976.

    Quote from cheeez

    Quick test yesterday evening, I thought I could test display port, I got my DP to HDMI cable and plugged it into the AVR (Denon 4700H) and lo and behold, no more audio dropouts within 15 minutes!? I'll test more this evening and report back! The motherboard is Asus N100I-D-D4 and I'm on 12.0.1, use passthrough and 23,976.

    What are you passing thru? truehd,dts-ma ...?

    Cross test, 4k content, DD5.1, 23.976, 12.0.1 Generic,

    1. Back to HDMI- HDMI cable = audio dropouts all 15 to 30 sec.

    2. New, good, HDMI- HDMI cable = audio dropouts and complete interruption of playback.

    3. Back to DP- HDMI cable = :)

    Quote from cheeez

    Cross test, 4k content, DD5.1, 23.976, 12.0.1 Generic,

    1. Back to HDMI- HDMI cable = audio dropouts all 15 to 30 sec.

    2. New, good, HDMI- HDMI cable = audio dropouts and complete interruption of playback.

    3. Back to DP- HDMI cable = :)

    Just to follow up on cheeez findings. The new Libreelec 12.0.1 release included an important kernel patch discussed here:
    No HBR Audio with LSPCON - Trying to collect information - General Support - LibreELEC Forum

    It fixes HBR audio streams for Paradetech and Synapitcs LSPCons (DP to HDMI convereter chips). It also seems to cause PCM >2 channels to no longer be bit perfect. It changes the output timings. Other might find 12.0.1 with a converter behaves differently/better.

    • New

    So these are builds containing the required kernel patch so the issue doesn't happen?

    I'm so far using the old build you once posted here of LE11 with this issue fixed. I'm trying to upgrade to these builds, but it's complaining that my platform is generic-ADL10 and these builds are for generic-BT2020, from googling BT2020 is de SDR standard, so do these versions completely disable hdr, or do they still allow for 10bit hdr?

    And it seems the issue on the intel gitlab is completely stalled as cannot reproduce, so in general, what's next regarding this issue? It'd be a real shame if all this nice new intel hardware could not be properly supported by libreelec...

    • New
    Quote from racemaniac

    the issue on the intel gitlab is completely stalled as cannot reproduce

    I'm not convinced that this is an Intel issue. Looks to me that those affected AVRs (Denon?) are all using the same chipset which has some issue with 4K 12-bit modes.

    • New
    Quote from smp

    I'm not convinced that this is an Intel issue. Looks to me that those affected AVRs (Denon?) are all using the same chipset which has some issue with 4K 12-bit modes.

    Just to add to this. i Have this issue with a newer denon reciever.

    • New

    I also use a Denon receiver and have the issue.

    I did find an interesting thread on the Kodi forum where they found the same (or at least very similar) issue, and think it's an issue with the audio clocks in that mode causing issues:
    Atmos audio drops / cuts on Denon X2800H and 24p playback

    They made this ticket for intel: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/8276

    Sounds very close to what we're experiencing.

    And after reading their thread, if taking the Denon receiver out of the equation solves the ticket, we should also test a non intel source on the denon to see if the issue persists. Because if other devices can perfectly play 4k hdr 24p through the Denon receiver, and only with intel we get the audio dropouts, it's some incompatibility between intel & Denon that coulds still have the root cause at either side.

    • New


    I've been watching this thread for a long time and have had an Intel NUC (8i7BEK) and a newer N100 working with a Yamaha RX-A3080 AVR. Both Intel platforms have the same audio dropout issues with Dolby Atmos and other bitstream audio sources. I've been living with this issue on Intel for a few years.

    I recently switched to a Beelink SER6 platform with an AMD processor and GPU. So far no dropouts with my Yamaha AVR. I realize it's way overkill but it's also lightning fast and no more dropouts. Prior to the Beelink SER6 I had tried a Raspberry Pi 5 for a few months with my AVR and no dropouts either. All running prior and the latest versions of LibreELEC.

    I even tried OSMC and the Vero 4K+ and Vero V with no dropouts. Only LibreELEC with the Intel platforms have dropouts in my setup. I've not tried running Windows / Kodi on any of the Intel; mini-PCs.


    Thanks,

    Jeff


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