Re: [Mactel-linux-users] Turning off the obnouxious power-on sound

[Alexandre B. <al...@bo...>]

Le vendredi 28 août 2009 à 13:18, Stefan Monnier a écrit:
> I could try that, except I have no idea what the "figure out which
> settings are applicable" step should look like: the few tiems I tried to
> run the efi shell (mostly to see what it looked like), I got the
> impression that no command worked there.  If someone has some hints of
> commands I could/should start with, that would help.

Hi, the variable you are looking for is named "SystemAudioVolume". When
the sound is muted in OS X System properties, it is equal to 0x80, so I
guess the most significant bit is a flag. Otherwise, the value seems to
represent a percentage, taking values between 0x03 up to 0x64 (but the
scale is not linear, as 25% in System properties is represented by
0x32).

Or at least this is how it seems to work on my 2006 Mac Pro.

To modify this in the EFI shell, it seems that you have to use the
dmpstore command, saving the variable to a file, modifying the file,
then loading it back.

Regards,
Alex