Mac boot chime only works after NVRAM reset.

[mrgooge]

Boot chime issue ? Opencore DEBUG 0.6.0

If I reset NVRAM, my Boot Chime works (chimes).

After I reboot and until I reset NVRAM, Boot Chime does not work (no chime).

My DEBUG log shows this after NVRAM reset:

07:832 00:004 OCAU: System volume is 98 (calculated from 70) - Success
07:836 00:003 OCAU: Matching PciRoot(0x0)/Pci(0x1F,0x3)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000)...
07:840 00:004 OCAU: 1/3 PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x1)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000) (6 outputs) - Success
07:844 00:003 OCAU: 2/3 PciRoot(0x0)/Pci(0x1F,0x3)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000) (5 outputs) - Success
07:848 00:004 OCAU: Setting language to en-US:0
07:852 00:003 OCAU: Language for audio en-US:0 - Success
07:856 00:003 OC: Starting to play chime...
07:860 00:004 OC: Wave Resources\Audio\OCEFIAudio_VoiceOver_Boot.wav was requested
07:867 00:006 OCAU: File 59 for lang 7 is 32 2 2 (440576) - Success

On the next reboot (and and reboot until NVRAM reset) My DEBUG log shows this:

07:807 00:007 OCAU: System volume is 0 (calculated from 0) - Success
07:814 00:007 OCAU: Matching PciRoot(0x0)/Pci(0x1F,0x3)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000)...
07:818 00:004 OCAU: 1/3 PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x1)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000) (6 outputs) - Success
07:822 00:004 OCAU: 2/3 PciRoot(0x0)/Pci(0x1F,0x3)/VenMsg(A9003FEB-D806-41DB-A491-5405FEEF46C3,00000000) (5 outputs) - Success
07:827 00:004 OCAU: Setting language to en:0
07:831 00:004 OCAU: Language for audio en:0 - Success

[icedterminal]

Are you using native or emulated NVRAM? By default, OC sample configs and the dortania guide have users use native. If using native, you should try using emulated after an NVRAM reset. See if the problem persists.

My experience with this feature was the same as yours until I switched to emulated. Native NVRAM for my board was not without issue.

[mrgooge]

Using native NVRAM. I set up emulated per the Dortania guides, and the boot chime problem persists using emulated or native. After NVRAM reset it chimes, after any reboot no chime. Same thing in the OC DEBUG log, "System volume is 0" after reboot.. I using a z370 series logic board btw.

[vit9696]

According to your log it is your operating system that sets the value of SystemAudioVolume variable to 0, which results in disabled boot chime. Works as designed (the way it does on Macs) in my opinion, do not mute the volume in your operating system, and it will work fine. Let me know if there is any detail I missed.

[mrgooge]

Yes, then something is broken with my operating system after restarting. I understand the volume for boot chime is set while booted, and yes, I made sure it was not muted before rebooting. I guess something is corrupt and muting it after a restart... If you have any idea where I could look, I'd appreciate it. Thank you for your time!

[vit9696]

Well, you can use nvram -x SystemAudioVolume | grep -vE '[<>]' | base64 --decode | xxd -i command to inspect the saved NVRAM volume level. Otherwise I do not know. Do you use AppleHDA or VoodooHDA? This might matter.

[mrgooge]

Using AppleHDA.
nvram -x SystemAudioVolume | grep -vE '[<>]' | base64 --decode | xxd -i
0x46

[vit9696]

What about next reboot (when there is no chime).

[mrgooge]

I get the same as above when there's no chime, the only place I see System volume is 0 is the OC DEBUG log...
I used the same EFI and booted to my clone drive after a NVRAM reset, chime good, rebooted again to clone drive chime good again...
So something corrupts or makes OC think the System volume is 0 , only when rebooting on my main disk.

Not to get to far off the path, but is it possible the /preboot partition could be corrupt and have this effect...?

If needed, I can send you a full Before and After OC DEBUG logs if you'd like?
I don't want to bug you too much about this...
Thanks again.

[vit9696]

That something can only be your NVRAM. Could you provide full OpenCore log and config.plist? I am worried if you might be overriding your SystemAudioVolume variable with some scripts or alike. Is that an old device? Might it have NVRAM issues?

[mrgooge]

Not too old, 2018 hardware. OS X Catalina 10.15.5. Attaching logs and config.plist. Thanks.
request_files.zip

[vit9696]

You have SystemAudioVolume set in config.plist. I believe it might confuse macOS. Try removing it.

[mrgooge]

I removed SystemAudioVolume set, still the same issue persists, no boot chime after reboot, only boot chime after NVRAM reset.

I did notice a new message pop up on boot, I don't know if it has anything to do with this:
" NVRAM log size exceeded, cannot log! "

I also enabled bootstrap, it made no difference.

Thanks again.

[vit9696]

Oh, lol. You are using NVRAM logging. Please disable it in Target. E.g. replace 81 with 65.