Audio out on DisplayPort but not HDMI, on AMD Ryzen APU/Vega

[Damjan Georgievski <gdamjan@gmail.com>]

I have a desktop computer with an AMD Ryzen 5 4650G PRO APU (CPU + on-die GPU).
The motherboard (MSI Mortar B550m wifi / bios 1.6). has one
displayport and one HDMI outputs.
The displayport is connected to my Lenovo P27 monitor, and the HDMI to
my Samsung TV.

When I choose the GPU as an audio out, I only get audio on the 3.5"
headphones jack of the Lenovo monitor, while I would like to get the
audio on the Samsung TV over HDMI.
I can't find a way to switch the different outputs (neither over
pipewire or just using native alsa).

pavucontrol configuration https://i.imgur.com/9nbVtNz.png
alsamixer -c0 only has only one option to mute s/pdif, which mutes the
output on the displayport -> Lenovo -> 3.5" jack.


$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 2: Generic_1 [HD-Audio Generic], device 0: ALCS1200A Analog
[ALCS1200A Analog]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 2: Generic_1 [HD-Audio Generic], device 1: ALCS1200A Digital
[ALCS1200A Digital]
 Subdevices: 1/1
 Subdevice #0: subdevice #0

Am I correct that card 1 here ^ should have at least two devices?


distro is Archlinux
kernel is 5.12.13-arch1-2
alsa-* 1.2.5.1-3
pipewire 1:0.3.30-2
plasma 5.22.2.1-1
xorg-server 1.20.11-1
amdgpu vanilla driver


$ aplay -L
null
   Discard all samples (playback) or generate zero samples (capture)
sysdefault
   Default Audio Device
samplerate
   Rate Converter Plugin Using Samplerate Library
speexrate
   Rate Converter Plugin Using Speex Resampler
jack
   JACK Audio Connection Kit
oss
   Open Sound System
pulse
   PulseAudio Sound Server
speex
   Plugin using Speex DSP (resample, agc, denoise, echo, dereverb)
upmix
   Plugin for channel upmix (4,6,8)
vdownmix
   Plugin for channel downmix (stereo) with a simple spacialization
default
   Default ALSA Output (currently PulseAudio Sound Server)
usbstream:CARD=C93
   罗技高清网络摄像机 C93
   USB Stream Output
hdmi:CARD=Generic,DEV=0
   HD-Audio Generic, HDMI 0
   HDMI Audio Output
usbstream:CARD=Generic
   HD-Audio Generic
   USB Stream Output
sysdefault:CARD=Generic_1
   HD-Audio Generic, ALCS1200A Analog
   Default Audio Device
front:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   Front output / input
surround21:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   4.0 Surround output to Front and Rear speakers
surround41:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Analog
   7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Generic_1,DEV=0
   HD-Audio Generic, ALCS1200A Digital
   IEC958 (S/PDIF) Digital Audio Output
usbstream:CARD=Generic_1
   HD-Audio Generic
   USB Stream Output

$ lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe
Dummy Host Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe
Dummy Host Bridge
00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe
Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal
PCIe GPP Bridge to Bus
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device
24: Function 7
16:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43ee
16:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43eb
16:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43e9
20:08.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43ea
20:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43ea
29:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
2a:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125
2.5GbE Controller (rev 04)
2b:00.0 Non-Volatile memory controller: ADATA Technology Co., Ltd. XPG
SX8200 Pro PCIe Gen3x4 M.2 2280 Solid State Drive (rev 03)
30:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Renoir (rev d9)
30:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
30:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD]
Family 17h (Models 10h-1fh) Platform Security Processor
30:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
30:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
30:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h
(Models 10h-1fh) HD Audio Controller

$ cat /proc/asound/devices
 1:        : sequencer
 2: [ 1- 3]: digital audio playback
 3: [ 1- 0]: hardware dependent
 4: [ 1]   : control
 5: [ 0- 0]: digital audio capture
 6: [ 0]   : control
 7: [ 2- 0]: digital audio playback
 8: [ 2- 0]: digital audio capture
 9: [ 2- 1]: digital audio playback
10: [ 2- 2]: digital audio capture
11: [ 2- 0]: hardware dependent
12: [ 2]   : control
33:        : timer

$ cat /proc/asound/cards
0 [C93            ]: USB-Audio - 罗技高清网络摄像机 C93
                     罗技高清网络摄像机 C93 at usb-0000:30:00.3-1, high speed
1 [Generic        ]: HDA-Intel - HD-Audio Generic
                     HD-Audio Generic at 0xfcb88000 irq 95
2 [Generic_1      ]: HDA-Intel - HD-Audio Generic
                     HD-Audio Generic at 0xfcb80000 irq 96

$ cat /proc/asound/card
card0/ card1/ card2/ cards


-- 
damjan