No Audio from AMDGPU HDMI on 5.19.2

[菜叶]

Hello,

I experienced this issue on Arch Linux 5.19.2-arch1-1 kernel on an HP
laptop with AMD Ryzen 6850HS CPU (detailed spec below), that the audio
is completely silent on the HDMI connected monitor. KDE audio settings
says everything works normally, HDMI audio shows up and can be
selected as the default output, just no sound from it.

It worked fine on Arch kernel v5.19.1-arch2. Laptop speakers always
work, and the monitor works when connected to another Windows laptop
over HDMI, so the monitor isn't the culprit I assume.

Kernel log from the journal didn't seem to contain something relevant,
but it may be me not knowing what to look for.

This is discovered on Arch Linux kernel 5.19.2-arch1-1, but also
reproducible on vanilla v5.19.2 tag.

Bisecting between tag v5.19.1 and v5.19.2 in the stable tree gives:
308d0d5d98c294b1185d6d7da60b268e0fe30193 is the first bad commit
commit 308d0d5d98c294b1185d6d7da60b268e0fe30193
Author: Leung, Martin <Martin.Leung at amd.com>
Date:   Fri May 13 17:40:42 2022 -0400

   drm/amdgpu/display: Prepare for new interfaces

   [ Upstream commit a820190204aef0739aa3a067d00273d117f9367c ]

Anything else I can do to investigate?

My hardware spec:
Laptop: HP EliteBook 845 14 inch G9 Notebook PC
CPU: AMD Ryzen 7 PRO 6850HS with Radeon Graphics
GPU: VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Rembrandt [Radeon 680M]

% lspci | grep -i audio
63:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt
Radeon High Definition Audio Controller
63:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD]
ACP/ACP3X/ACP6x Audio Coprocessor (rev 60)
63:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family
17h/19h HD Audio Controller

Software:
plasma-desktop 5.25.4-1
plasma-pa 5.25.4-1
pipewire 1:0.3.56-1
pipewire-pulse 1:0.3.56-1
wireplumber 0.4.11-4
alsa-card-profiles 1:0.3.56-1
linux-firmware 20220708.be7798e-1
sof-firmware 2.2-1