[BUG] Realtek ALCS1200A (ASRock B550 Phantom Gaming 4) not detected by PipeWire — only HDMI outputs visible

Bazzite
1

System info:

  • OS: Bazzite (KDE Desktop)
  • Motherboard: ASRock B550 Phantom Gaming 4
  • GPU: NVIDIA RTX 2070
  • Audio chip: Realtek ALCS1200A

Problem:

After a fresh install of Bazzite, only the NVIDIA HDMI audio outputs are visible in the sound settings. My speakers and headphones connected via 3.5mm jack on the motherboard are not showing up at all. Everything worked fine on Windows.

pactl list cards short only returns 2 cards (both NVIDIA HDMI):

50    alsa_card.pci-0000_06_00.1    alsa
51    alsa_card.pci-0000_08_00.4    alsa

lspci | grep -i audio also only shows the NVIDIA cards — the Realtek does not appear.

What I tried:

  • Enabled HD Audio in BIOS (was set to Auto)
  • Installed pavucontrol — only Digital/Pro profiles visible, no Analog
  • Tried options snd-hda-intel model=auto in /etc/modprobe.d/alsa.conf → no change
  • Tried options snd-hda-intel model=alc1200 → no change
  • Tried options snd-hda-intel model=dell-headset-multi → no change

However, dmesg | grep -i snd shows the Realtek IS detected at boot:

snd_hda_codec_alc882 hdaudioC1D0: ALCS1200A: SKU not ready 0x00000000
snd_hda_codec_alc882 hdaudioC1D0: autoconfig for ALCS1200A: line_outs=1 (0x14) type:line
snd_hda_codec_alc882 hdaudioC1D0: hp_outs=1 (0x1b)
input: HD-Audio Generic Front Headphone
input: HD-Audio Generic Line Out

The “SKU not ready 0x00000000” line seems to be the root cause — the driver detects the chip but fails to configure it, so PipeWire ignores it entirely.

Any idea how to fix this? Is there a known workaround for the ALCS1200A SKU issue on this motherboard?

Thank you!