No audio after Big Sur update on ASRock Z490 / AppleALC 1.5.4?

Hi,

  • ASRock Z490M-ITX/ac
  • Intel i7-10700K
  • OpenCore 0.6.3
  • AppleALC 1.5.4

I just updated to Big Sur and all* went smoothly - I left the process running cia Software Update and returned to find a Big Sur login screen.

*However I now have no audio. According to the release notes for AppleALC, native support for my motherboard was introduced at v1.5.2 ("Added ALCS1200A layout-id 49 for Asrock Z490M-ITX by VanXNF").

My Opencore bootargs in NVRAM are -v alcid=49 keepsyms=1 and my kexts are as follows:

  • USBPorts (1.0)
  • AppleALC (1.5.4)
  • VirtualSMC (1.1.8)
  • Lilu (1.4.9)
  • IntelMausi (1.0.3)
  • USBWakeFixup (1.0)

I'm a bit out of ideas - can anyone suggest something I can try to fix this please?

Thanks

submitted by /u/PuzzleheadedLychee65
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