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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.
Mute startup sound permanently - Apple Community
https://discussions.apple.com/thread/7409705
I tried running sudo nvram SystemAudioVolume="%00" from terminal, as a friend recommended, but this simply does not mute the startup sound (not even once). Is there another way to do this? Thanks. Mac. More Less. iMac (Retina 5K, 27-inch, Late 2015), OS X El Capitan (10.11.1) Posted on Jan 6, 2016 5:41 AM ...
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=%01 sudo nvram SystemAudioVolume=%00 sudo nvram SystemAudioVolume=" "(In the above command, that’s a single space character between the quotation marks.) Many websites say you can silence your Mac at boot by pressing the “Mute” button on your keyboard and holding it down right after you boot the Mac up.
sudo nvram SystemAudioVolume=%00 sudo nvram -d ...
https://pastebin.com/vZLu0xKh
Jul 12th, 2014. 306. Never. Not a member of Pastebin yet? Sign Up , it unlocks many cool features! text 0.07 KB. raw download clone embed print report. sudo nvram SystemAudioVolume=%00. sudo nvram -d SystemAudioVolume.
Boot Sound - Apple Community
https://discussions.apple.com/thread/251097620
sudo nvram SystemAudioVolume=%80. sudo nvram SystemAudioVolume=%01. sudo nvram SystemAudioVolume=%00. sudo nvram SystemAudioVolume=" "I also tested to first turn it in the default state with: sudo nvram -d SystemAudioVolume. and then run the commands. I tested them one by one. None of them works anymore.
macos - How to permanently disable the Mac startup sound ...
https://apple.stackexchange.com/questions/431910/how-to-permanently-disable-the-mac-startup-sound
I tried any of the following commands: 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).
Mac startup chime: How to make it work or ... - Cult of Mac
https://www.cultofmac.com/686749/how-to-resurrect-your-macs-startup-chime/
sudo nvram -d SystemAudioVolume And if the above commands don’t work, you can try some alternatives: sudo nvram SystemAudioVolume=%01 sudo nvram SystemAudioVolume=%00 sudo nvram SystemAudioVolume="...
How to permanently turn off your Mac’s startup sound ...
https://www.chriswrites.com/how-to-permanently-turn-off-your-macs-startup-sound/
sudo nvram SystemAudioVolume=%01; sudo nvram SystemAudioVolume=%00; sudo nvram SystemAudioVolume=” “ If at any point you want to re-enable the startup sound, then simply launch a Terminal window and run the following command: sudo nvram -d SystemAudioVolume
Mac boot chime only works after NVRAM reset. #1012 - …
https://github.com/acidanthera/bugtracker/issues/1012
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.
Modify an efi var with efivar - Unix & Linux Stack Exchange
https://unix.stackexchange.com/questions/536436/linux-modify-an-efi-var-with-efivar
nvram SystemAudioVolume=%00 They also used recovery mode to do this by holding Cmd + Option + R. Another option is to simply write to the variable using printf, a method discussed in the comments of the blog. Note: This method is potentially dangerous, it is advised to use the previous method first.
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