Il suono di avvio risiede nella NVRAM.
Per disabilitarlo in OS X, esegui sudo nvram BootAudio=%00
Ho trovato questo per Linux:
# efivar -l | grep SystemAudioVolume
7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolume
7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolumeDB
# efivar -n 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolume -p
GUID: 7c436110-ab2a-4bbb-a880-fe41995c9f82
Name: "SystemAudioVolume"
Attributes:
Non-Volatile
Boot Service Access
Runtime Service Access
Value:
00000000 00 |. |
# efivar -n 7c436110-ab2a-4bbb-a880-fe41995c9f82-SystemAudioVolumeDB -p
GUID: 7c436110-ab2a-4bbb-a880-fe41995c9f82
Name: "SystemAudioVolumeDB"
Attributes:
Non-Volatile
Boot Service Access
Runtime Service Access
Value:
00000000 00
#
SOURCE