[HELP] ASUS ROG Strix Scar 15 (G533ZW, 2022) huge DPC spikes from ACPI.sys (audio buzz + game freezes)

[Zeph]

TL;DR: LatencyMon flags ACPI.sys with ~33 ms DPC spikes on my Scar 15. I sometimes get a short audio buzz and a brief game freeze. I’ve already done clean GPU drivers + fresh Windows + latest BIOS. Looking for other owners’ results and any fix that actually stuck.

My system

• Model: ROG Strix Scar 15 G533ZW (2022)
• CPU/GPU: i9-12900H / RTX 3070 Ti
• RAM: 32 GB
• BIOS: 324 (latest)
• OS: Windows 11 Home 24H2 (build 26100)
• MUX: dGPU-only (on) | Armoury Crate Turbo
  
   

LatencyMon highlights (8m 27s run)

Highest interrupt-to-process: 32285.70 µs

Highest DPC routine time: 33855.66 µs (ACPI.sys)

Highest ISR routine time: 437.26 µs (ACPI.sys)

Driver w/ most total DPC time: nvlddmkm.sys (NVIDIA)

Hard pagefaults present (not primary issue)

What I’ve already tried

• DDU in Safe Mode installed community-recommended stable NVIDIA driver 566.36 (also tested others).
• Fresh Windows install + all ASUS/Windows updates.
• Latest chipset/MEI/audio/Wi-Fi/BT drivers.
• Turbo profile, MUX dGPU-only.

Screenshot/log attached. Thanks in advance happy to try anything reproducible and report back with what works.
 

Asus has stopped releasing BIOS updates for this model in 2023 and I feel like this is now more of a BIOS/EC issue than the drivers themselves but i really don't know.
 

Latency Mon logs: Logs

Thanks in advance.