[BUG] ntel Alder Lake PCH-P (ALC236) audio controller missing after warm reboot on HP dw4xxx

[gkesebir]

Hardware Information

• Laptop Model: HP Laptop 15-dw4xxx (Subsystem ID: 103c:89a0)
• Audio Controller: Intel Corporation Alder Lake PCH-P High Definition Audio Controller [8086:51c8] (rev 01)
• Audio Codec: Realtek ALC236
• OS: Linux Mint 21/22 (PipeWire 1.0.5 with WirePlumber 0.4.17)

Symptoms

1. Audio missing on warm reboot: After choosing "Restart" from the OS, the audio controller is completely missing or fails to initialize. aplay -l returns "no sound cards found".
2. Works on cold boot: If the system is fully powered down (Shut Down) and then turned back on, the sound card is detected and works properly.
3. Shutdown freeze with SOF driver: Under the default sof-audio-pci-intel-tgl driver, the laptop fails to turn off during shutdown (hangs on a black screen with a blinking cursor). Forcing snd-intel-dspcfg dsp_driver=1 fixes the shutdown hang, but the warm reboot issue persists.

Kernel Logs during failed warm boot (snd_hda_intel)

The driver hangs during initialization and fails to probe the Realtek codec:
[ 3.949811] snd_hda_intel 0000:00:1f.3: enabling device (0000 -> 0002)
[ 4.678584] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops intel_audio_component_bind_ops [i915])
(No codec probe or Realtek driver initialization messages follow this)

[lgirdwood]

@gkesebir which kernel and SOF version is being used here ? Are you able to provide more logs for initial probe for audio. Thanks.