BootChime

Py script to aid in setting up the boot chime in OpenCore. It does so by helping you locate your IOHDACodecDevices, IOHDACodecAddress values, current SystemAudioVolume, and by helping you calculate your VolumeAmplifier and MinimumVolume.

Quick Start

• Clear any existing SystemAudioVolume value from both the local NVRAM, and the config.plist (in NVRAM -> Add and NVRAM -> Delete)
• Set your audio output device to your internal codec, turn the volume all the way up, and reboot
  • In most cases, this will save the max SystemAudioVolume value for your codec
  • In situations where this value is not properly saved, it may indicate an issue with your NVRAM, or codec - and this script isn't likely of use
• Open the BootChime script and select S. Save current SystemAudioVolume as max to retain this value, and auto-calculate the VolumeAmplifier
  • Copy the VolumeAmplifier integer value to your config.plist -> UEFI -> Audio -> VolumeAmplifier

This should yield a "sane" VolumeAmplifier value based off your max SystemAudioVolume. After determining this value, you can further fine tune when the chime is muted by configuring a MinimumVolume level as follows:

• Set your system volume to the level where you'd like the chime to mute and reboot
• Open BootChime and check what it reports for the Current SystemAudioVolume as MinimumVolume
  • It lists a range of numbers up to 100 that can be used to mute the chime at the current volume
  • For example, my Dell 5580 reports the following at half volume: --> 96 (use 97-100 to mute at this volume)
• Copy the desired minimum value to your config.plist -> UEFI -> Audio -> MinimumVolume

Pitfalls

You are still encouraged to work through Dortania's Post-Install guide to determing the proper values for your setup, though this script can make a number of them easier to find and calculate.

Note: Some codecs do not report a wide range of SystemAudioVolume values - so MinimumVolume may be difficult to fine-tune (if possible at all). In playing with these settings, I found that my Dell 5580 used the same value from just over half volume all the way to max, while my HP Envy 15-j003cl had many more valid audio steps. Your mileage may vary.

Thanks

• Acidanthera for OpenCore and a myriad of other contributions
• Apple for macOS
• Dortania for their OpenCore guide
• Many others