Audio devices suddenly gone. ALC 1150 High Sierra.

[rankrotten]

I have been using toleda's cloverALC patch through several iterations of MacOS without any trouble. It has been fine for several weeks with High Sierra: however I am now not getting any audio devices listed in Sound preferences.

I had a system freeze on the Mac screensaver and reset the computer which went into a restart loop so clear CMOS, reload BIOS defaults and boot up, all ok. Sound working as normal but after a few hours all audio devices are gone.

Removed all the clover patches and installed native AppleHDA then patched again as per toleda's instructions: no audio devices....

I can see everything is ok using DPCI Manager, audio ID is 1 but nothing is listed in sound prefs.

audio_codecdetect reports

File: audio_codecdetect.command_v2.2
HDMI audio codec(s
Onboard audio codec
Realtek: 0x10ec0900
Name: Realtek ALC1150
Audio ID: 1
Valid audio codec, audio device and Audio ID; audio injection is working

I even used the APFS snapshots feature to roll back the system to a known working state: no audio devices.

I can dual boot Clover into windows and the audio works fine.

Bizarre behaviour?

Z97X-UD7 TH, ALC 1150, Mac OS 10.13 supplemental, Clover 4259 with cloverALC. iMac 15,1 Mac-FA842E06C61E91C5

 

[toleda]

When the devices are gone, see No Audio Devices - AppleHDA Realtek Audio/Post #1/IV. Problem Reporting. Post to thread linked with requested files attached.