Seems like the latest security fix also enabled the annoying startup chime in Catalina. For Big Sur there is a setting to disable it but I cannot find one in Catalina.
MBP 16" (2019)
This command actually worked for Catalina as well:
sudo nvram StartupMute=%01
This command actually worked for Catalina as well:
sudo nvram StartupMute=%01
Since this was a new feature supposedly to be in Big Sur I exepect that to be in Big Sur (with the option to shut it off!) and not in Catalina.
As a "valuable indicator" I would have agreed on my on Mac IIcx with a Radius Two-Page monitor card that sometimes acted up, but on any modern laptop since 1997 you have a screen perfectly good for displaying diagnostic messages.
The Boot Chime is a valuable indicator of the 'health' of your hardware. How can you be annoyed with it? Regardless, what I do to suppress the boot chime is to press the mute button. Have you tried that?
Mattias Sandstrom wrote:
Since this was a new feature supposedly to be in Big Sur I exepect that to be in Big Sur (with the option to shut it off!) and not in Catalina.
actually, it's not a new feature. it goes back at least as far as OS X 10.6 snow leopard.(which was on my first mac) they took it away as a default in catalina and people wined and cried enough that apple re-introduced it. and yes, even while it was "gone" you could still turn it off or on with the terminal commands.
Clarify, this started after installing 2020-001 Security Update and I am now on Catalina 10.15.7 (19H114)
How to disable startup chime in Catalina??
