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How to reverse: sudo nvram SystemAudioVol… - Apple Community
https://discussions.apple.com/thread/6741774
This was the terminal command I entered: sudo nvram SystemAudioVolume=%80. Now my Facetime audio output won't work. All other system audio seems fine. How do I reverse this command? I can deal with the startup chime, but I need people to hear me on Facetime. Thanks for any help in advance. Steve
How to Disable the Boot Sound (or “Startup Chime”) on a …
https://www.howtogeek.com/260693/how-to-disable-the-boot-sound-or-startup-chime-on-a-mac/
sudo nvram SystemAudioVolume=%80. Enter your password when prompted and press Enter. Restart your Mac and you won’t hear the sound. If you’d like to undo your change later and have the startup chime play normally when you boot your Mac, run the following command: sudo nvram -d SystemAudioVolume Help, the Command Didn’t Work!
macos - How to permanently disable the Mac startup sound ...
https://apple.stackexchange.com/questions/431910/how-to-permanently-disable-the-mac-startup-sound
sudo nvram SystemAudioVolume=%80 sudo nvram SystemAudioVolume=%01 sudo nvram SystemAudioVolume=%00 sudo nvram SystemAudioVolume=” “ After each command, I did a shutdown of the Mac, and started it up again (no reboot). In all 4 cases, the startup sound was still played after I turned on the Mac.
Mac startup chime: How to make it work or mute it …
https://www.cultofmac.com/686749/how-to-resurrect-your-macs-startup-chime/
sudo nvram SystemAudioVolume=%80. As before, you’ll need to enter your password to make this work. If you try to run it without the sudo part, you’ll get an error message.
How to Disable the Mac Boot Chime Completely
https://osxdaily.com/2012/11/04/disable-mac-boot-chime/
sudo nvram SystemAudioVolume=%80 Enter the admin password when requested, which is required by usage of the sudo command. On your next reboot the Mac will be completely silent. Adjusting the parameter at the end of that command lets you change the total volume of that boot chime, but it appears to favor ascii characters.
Linux – Modify an efi var with efivar – iTecTec
https://itectec.com/unixlinux/linux-modify-an-efi-var-with-efivar/
sudo nvram SystemAudioVolume=%80 but nvram command is not available on Linux; there is however, another program called nvramtool. Reading the man of nvramtool it's possible to get all coreboot parameters running nvramtool -a but the output of the command is: nvramtool: coreboot table not found. coreboot does not appear to be installed on this system.
Disable Startup Chime in Sierra | MacRumors Forums
https://forums.macrumors.com/threads/disable-startup-chime-in-sierra.2003479/
Running the old code sudo nvram SystemAudioVolume=%80 command in Sierra's terminal from the recovery partition, I get an error "command sudo not...
SystemAudioVolume not working in Yosemite · Issue …
https://github.com/mathiasbynens/dotfiles/issues/517
Of course, tried with different options: " ", %00, %80, %01 and couple of more. doing sudo nvram SystemAudioVolumeDB="<option_here>", where <option_here> are the values used in point above, returns success, I can verify it by running sudo nvram -p | grep SystemAudioVolume
terminal - Has Unix Parameter Name SystemAudioVolume Been ...
https://apple.stackexchange.com/questions/367502/has-unix-parameter-name-systemaudiovolume-been-changed-to-systemaudiovolume-db-i
Firstly, the sudo nvram SystemAudioVolume=%00 (or the same command with different values at end) never allowed users to actually change the startup chime sound. In earlier versions of Mac OS X it did allow users to change the volume, and therefore they could mute the startup chime, but this did not change the sound.. The closest thing to changing the sound is a …
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