Audio/Sound not working over HDMI (KMS) ALSA lib pcm snd_pcm_recover underrun occurred

[shad00m]

Describe the bug
When KMS is used, the audio does not work in amiberry when HDMI is selected in the audio settings, only the audio jack works.
HDMI Audio works fine in amiberry when FKMS is selected.

To Reproduce

1. set vc4-kms-v3d (default in 64bit bullseye)

2. Let Retropie Compile amiberry/compile it yourself with PLATFORM=rpi4-64-sdl2

3. Run amiberry with any game

4. No HDMI-Audio works

5. error in /dev/shm/runcommand.log

Parameters:
Executing: /opt/retropie/emulators/amiberry/amiberry.sh "/home/pi/RetroPie/roms/amiga/J/JaguarXJ220_v1.7_Files_1200.lha"
Launching ...
./amiberry --autoload /home/pi/RetroPie/roms/amiga/J/JaguarXJ220_v1.7_Files_1200.lha -G
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred

Expected behavior
Audio to work in KMS as well not only in FKMS.

• OS: [e.g. iOS]
  Linux pi 5.15.48-v8+ aarch64
  RetroPie installed through RetroPie-Setup

• Version [e.g. 22]
  RetroPie installed 5.2 I think.
  I also tried Amiberry by manually compiling it with "PLATFORM=rpi4-64-sdl2"
  SDL2 is 2.0.20

Additional context
When using KMS I have 3 Audio devices selectable in Amiberry:

SDL2: bcm2835 Headphones, bcm2835 Headphones
SDL2: vc4-hdmi-0, MAI PCM i2s-hifi-0
SDL2: vc4-hdmi-1, MAI PCM i2s-hifi-0

Only the Headphone jack outputs audio, whenever I select one of the HDMIs the "Sound Emulation" in amiberry gets disabled automatically and the error mentioned above is getting spammed. Setting the config.txt to fkms fixes this problem but fkms causes the mouse cursor to be slow.

[solskogen]

Try installing portaudio and reboot.

[shad00m]

thank you for the quick reply
libportaudio2 was already installed unfortunately

[solskogen]

Does speaker-test -c2 produce any sound?

[solskogen]

Oh, sorry. I didn't mean portaudio. I meant pulseaudio :-)

[shad00m]

Does speaker-test -c2 produce any sound?

yep that produces a "buzzing" sound, any other emulator (libretro, mame, duckstation etc) works as well
pulseaudio is installed as well:

pi@pi:~ $ sudo dpkg -l | grep -i pulseaudio
ii  libpulse-dev:arm64                   14.2-2+rpi1                      arm64        PulseAudio client development headers and libraries
ii  libpulse-mainloop-glib0:arm64        14.2-2+rpi1                      arm64        PulseAudio client libraries (glib support)
ii  libpulse0:arm64                      14.2-2+rpi1                      arm64        PulseAudio client libraries
ii  libpulsedsp:arm64                    14.2-2+rpi1                      arm64        PulseAudio OSS pre-load library
ii  lxplug-volumepulse                   0.12                             arm64        PulseAudio controller plugin for lxpanel
ii  pulseaudio                           14.2-2+rpi1                      arm64        PulseAudio sound server
ii  pulseaudio-module-bluetooth          14.2-2+rpi1                      arm64        Bluetooth module for PulseAudio sound server
ii  pulseaudio-utils                     14.2-2+rpi1                      arm64        Command line tools for the PulseAudio sound server

[solskogen]

Is pulseaudio running?

[solskogen]

The sound panel shows "SDL2: Built-in Audio Digital Stereo (HDMI)" on my system. You can also try to switch using the other HDMI port.

[shad00m]

pi@pi:~ $ ps aux |grep -i pulseaudio
pi           738  0.6  1.2 610976 23808 ?        S<sl 11:39   0:00 /usr/bin/pulseaudio --daemonize=no --log-target=journal

It appears to be running, however I found:

Jun 21 11:42:17 pi dbus-daemon[357]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.113' (uid=1000 pid=1630 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo")
Jun 21 11:43:35 pi pulseaudio[1630]: Failed to find a working profile.
Jun 21 11:43:35 pi pulseaudio[1630]: Failed to load module "module-alsa-card" (argument: "device_id="2" name="platform-fef05700.hdmi" card_name="alsa_card.platform-fef05700.hdmi" namereg_fail=false tsched=no fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.

Not sure if this is related

I have tried both HDMI Ports but amiberry switches "sound emulation" to "disabled, but emulated" every time.
https://user-images.githubusercontent.com/9115740/174784385-ad21509d-83ea-4a11-b40e-ab2f52a3cfae.mp4
note: in the video im running it in x11-forwarding just to record the video

[solskogen]

Are you running RetroPie on a Bullseye? If so, my guess is that the RetroPie script does something that is not fully compatible with bullseye.

[shad00m]

Are you running RetroPie on a Bullseye? If so, my guess is that the RetroPie script does something that is not fully compatible with bullseye.

yeah, on 64bit and bullseye, which both aren't supported by RetroPie. Oddly enough everything else worked except the audio in amiberry :\

[solskogen]

I've reported this both on SDL2 forums and on Raspberry Pi github. I don't understand how it really works, because without pulseaudio running I cannot get sound in amiberry either (vanilla Raspberry Pi OS Bullseye), even if speaker-test -c2 produces pink noise.

[solskogen]

I've converted this to a discussion as you're running a unsupported configuration.

[shad00m]

The custom SDL2 seems to be the issue. As soon as I remove it and install the official packages, amiberry works without a problem.
libsdl2-2.0-0 and libsdl2-image-2.0-0 libsdl2-ttf-2.0-0
Unfortunately RetroPie needs that custom SDL2 :. I guess I have to wait for them...
Thank you for all the help though solskogen <3