Can you attach the output from "pactl list cards"?

Sure, here is the output of "pactl list cards", my remote control also has a microphone and a headphone connector.

Karte #0
        Name: alsa_card.pci-0000_00_1f.3
        Treiber: module-alsa-card.c
        Owner-Modul: 6
        Eigenschaften:
                alsa.card = "0"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0xdf640000 irq 146"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1f.3"
                sysfs.path = "/devices/pci0000:00/0000:00:1f.3/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "a170"
                device.product.name = "Sunrise Point-H HD Audio"
                device.form_factor = "internal"
                device.string = "0"
                device.description = "Internes Audio"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Profile:
                input:analog-stereo: Analog Stereo Input (sinks: 0, sources: 1, priority: 60, available: yes)
                output:analog-stereo: Analog Stereo Output (sinks: 1, sources: 0, priority: 6000, available: yes)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (sinks: 1, sources: 1, priority: 6060, available: yes)
                output:analog-surround-40: Analog Surround 4.0 Output (sinks: 1, sources: 0, priority: 700, available: yes)
                output:analog-surround-40+input:analog-stereo: Analog Surround 4.0 Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 760, available: yes)
                output:analog-surround-51: Analog Surround 5.1 Output (sinks: 1, sources: 0, priority: 800, available: yes)
                output:analog-surround-51+input:analog-stereo: Analog Surround 5.1 Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 860, available: yes)
                output:iec958-stereo: Digital Stereo (IEC958) Output (sinks: 1, sources: 0, priority: 5500, available: yes)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 5560, available: yes)
                output:hdmi-stereo: Digital Stereo (HDMI) Output (sinks: 1, sources: 0, priority: 5400, available: yes)
                output:hdmi-stereo+input:analog-stereo: Digital Stereo (HDMI) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 5460, available: yes)
                output:hdmi-surround: Digital Surround 5.1 (HDMI) Output (sinks: 1, sources: 0, priority: 300, available: yes)
                output:hdmi-surround+input:analog-stereo: Digital Surround 5.1 (HDMI) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 360, available: yes)
                output:hdmi-surround71: Digital Surround 7.1 (HDMI) Output (sinks: 1, sources: 0, priority: 300, available: yes)
                output:hdmi-surround71+input:analog-stereo: Digital Surround 7.1 (HDMI) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 360, available: yes)
                output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (sinks: 1, sources: 0, priority: 5200, available: yes)
                output:hdmi-stereo-extra1+input:analog-stereo: Digital Stereo (HDMI 2) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 5260, available: yes)
                output:hdmi-surround-extra1: Digital Surround 5.1 (HDMI 2) Output (sinks: 1, sources: 0, priority: 100, available: yes)
                output:hdmi-surround-extra1+input:analog-stereo: Digital Surround 5.1 (HDMI 2) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 160, available: yes)
                output:hdmi-surround71-extra1: Digital Surround 7.1 (HDMI 2) Output (sinks: 1, sources: 0, priority: 100, available: yes)
                output:hdmi-surround71-extra1+input:analog-stereo: Digital Surround 7.1 (HDMI 2) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 160, available: yes)
                output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (sinks: 1, sources: 0, priority: 5200, available: yes)
                output:hdmi-stereo-extra2+input:analog-stereo: Digital Stereo (HDMI 3) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 5260, available: yes)
                off: Aus (sinks: 0, sources: 0, priority: 0, available: yes)
        Aktive Profile: output:hdmi-stereo-extra2
        Profile:
                analog-input-front-mic: Front Microphone (priority: 8500, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "audio-input-microphone"
                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-surround+input:analog-stereo, output:hdmi-surround71+input:analog-stereo, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1+input:analog-stereo, output:hdmi-surround71-extra1+input:analog-stereo, output:hdmi-stereo-extra2+input:analog-stereo
                analog-input-rear-mic: Rear Microphone (priority: 8200, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "audio-input-microphone"
                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-surround+input:analog-stereo, output:hdmi-surround71+input:analog-stereo, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1+input:analog-stereo, output:hdmi-surround71-extra1+input:analog-stereo, output:hdmi-stereo-extra2+input:analog-stereo
                analog-input-linein: Line In (priority: 8100, latency offset: 0 usec, not available)
                        Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-51+input:analog-stereo, output:iec958-stereo+input:analog-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-surround+input:analog-stereo, output:hdmi-surround71+input:analog-stereo, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1+input:analog-stereo, output:hdmi-surround71-extra1+input:analog-stereo, output:hdmi-stereo-extra2+input:analog-stereo
                analog-output-lineout: Line Out (priority: 9900, latency offset: 0 usec, not available)
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-40, output:analog-surround-40+input:analog-stereo, output:analog-surround-51, output:analog-surround-51+input:analog-stereo
                analog-output-headphones: Analoge Kopfhörer (priority: 9000, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "audio-headphones"
                        Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
                iec958-stereo-output: Digital Output (S/PDIF) (priority: 0, latency offset: 0 usec)
                        Part of profile(s): output:iec958-stereo, output:iec958-stereo+input:analog-stereo
                hdmi-output-0: HDMI / DisplayPort (priority: 5900, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo, output:hdmi-stereo+input:analog-stereo, output:hdmi-surround, output:hdmi-surround+input:analog-stereo, output:hdmi-surround71, output:hdmi-surround71+input:analog-stereo
                hdmi-output-1: HDMI / DisplayPort 2 (priority: 5800, latency offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra1, output:hdmi-stereo-extra1+input:analog-stereo, output:hdmi-surround-extra1, output:hdmi-surround-extra1+input:analog-stereo, output:hdmi-surround71-extra1, output:hdmi-surround71-extra1+input:analog-stereo
                hdmi-output-2: HDMI / DisplayPort 3 (priority: 5700, latency offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "marantz-AVR"
                        Part of profile(s): output:hdmi-stereo-extra2, output:hdmi-stereo-extra2+input:analog-stereo

pactl shows that there are surround profiles for "HDMI" and "HDMI 2" outputs, but "HDMI 3" only has the stereo profile. Is your problem that you want or have to use "HDMI 3"?

> The mainboard has 2 HDMI and 1 DP connectors. It's no matter which of these
> connectors is connected to my AVR.

What do you mean by this? Do you mean that regardless of which physical output you use, only the "HDMI 3" stereo profile produces audio and the "HDMI" and "HDMI 2" profiles do nothing?

I mean, that the connected profile (no matter if it is HDMI, HDMI2 or DP) only has a stereo profile (which is working). If I connect another cable, than this one will have no surround profile and the other ones will have surround options.

Does "speaker-test --device=hdmi:0,0 --channels=6" work? You can also try with --channels=8. This test bypasses PulseAudio, so if surround audio doesn't work with plain alsa, there's nothing PulseAudio can do.

hdmi:0,0 corresponds to "HDMI" in PulseAudio, hdmi:0,1 corresponds to "HDMI 2" and hdmi:0,2 corresponds to "HDMI 3".

The speaker test did say, that the number of channels is not valid for this device.

But I did found a workarround. Connecting a HDMI and the DP connection, but using only the DP connection works, because only 1 of 3 connections is missing the surround options.

Strange behavior! Where could be the problem?

> Strange behavior!

Indeed.

> Where could be the problem?

No idea. The alsa driver developers might know.

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