Only 2.0 audio via HDMI

Greetings,

Got an issue with HDMI Audio here: I am unable to get 5.1 surround via vc4-hdmi-0

5.1 surround gets requested, but ALSA only gets back stereo:

DEBUG <general>: CAESinkALSA::GetChannelLayout - Requested Layout: FL, FR, FC, LFE, BL, BR 
DEBUG <general>: CAESinkALSA::GetChannelLayout - Got Layout: FL, FR (ALSA: FL FR)

Full LOG here:

Any idea what is wrong here and how to fix?

Thanks for feedback.

Had the Extractor initially connected separately to vc4-hdmi-1 but had the same issue. While doing trial and error, one of the HDMI A-D cable broke - so I were forced to plug it in between vc4-hdmi-0 and TV.

€dit:

Cable actually is connected to the HDMI port next to the USB-C - issue is not fixed.

Also tried some config.txt options like hdmi_force_edid_audio=1 or hdmi_ignore_edid=0xa5000080 but no luck. I only get 2 PCM channels over HDMI. According to HDMI specs, you can send 8 PCM audio streams via HDMI. Maybe is ALSA the issue? ALSA only reports 2 channel audio

Congrats, we found a nightly bug.

Current Stable kodi.log:

These also appear with current stable:

INFO <general>: CAESinkALSA - Unable to open device "surround71" for playback

But:

2021-12-27 00:15:05.075 T:1123     INFO <general>:     Device 2
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_deviceName      : sysdefault
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_displayName     : vc4-hdmi-0 ()
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_displayNameExtra: MAI PCM i2s-hifi-0
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_deviceType      : AE_DEVTYPE_PCM
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_channels        : FL, FR, LFE, UNKNOWN1, FC, BC, BL, BR, BLOC, BROC, FLOC, FROC
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_sampleRates     : 32000,44100,48000,88200,96000,176400,192000
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_dataFormats     : AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE
2021-12-27 00:15:05.075 T:1123     INFO <general>:         m_streamTypes     : No passthrough capabilities

ALSA reports devices back with 12 channels instead of 2. Any idea how to identify the root cause for this?

Surround is working now.

I'm back again with multichannel audio issues:

Currently on 12.0-nightly-20230918-aaaa788.

Channel layout is OK this time - but even with stereo Upmix all I get is audio from FR and BL - rest of channels is silent.

Then after rebooting, i got audio from FR and BR. Its like russian roulette but with audio channels.

Then again system sounds - like the clicking when changing menu items - will play on FL and BR.

Something is seriously borked currently. Even not sure if this is scope of LE Team. Maybe also faulty on Kodis end. Or Layer 8. Cant be sure

Edit:

Checked against Layer 8 issue. FR input == FR output etc.. Wiring OK, not screwed up. So signal input from RPi is faulty which means Kodi or LE. Also same setup used to work as intended back with LE 10 and 11

Edit reloaded:

When setting Audiochannels to 2.0 in system setup, FR and FL working. Everything above 2.0 either the channels are addressed incorrectly / not at all, or the mapping is screwed up somehow. But both are software problems