how to turn off autoboot in macbook m3 air?

What do you mean by 'autoboot'? Do you mean scheduled power on/off? Or perhaps auto-restart after a power failure? Apple removed the scheduled power on/off feature from the System Settings. However, you can open Terminal and type in commands to adjust more advanced power settings.

Schedule your Mac to turn on or off in Terminal - Apple Support

Open Terminal and type:

man pmset

To view the manual for the pmset command

Might be as simple as:

pmset -g sched

This lists any scheduled events to power on or off

This will cancel any repeat scheduled power events such as daily:

sudo pmset repeat cancel

This will disable the Power Nap feature:

sudo pmset powernap 0

This will prevent the Mac from powering back on after a power outage:

sudo pmset autorestart 0

This will list the power features supported by your hardware (varies between Mac models):

pmset -g cap

There's quite a bit more in the Man pages for pmset.

If I understand correctly and correct me if I am not

The computer will Auto Boot once the Lid has been opened

The computer can be shutdown and the Lid is still open, One you touch any key on the keyboard, the computer will Auto Boot

Does this sound right ?

New Apple Computers like the M3 MacBook Air is Designed By Apple to Auto Boot when any of the above is performed

There is no know way AFAIK to stop this

James Brickley wrote:

It's no longer available on Apple Silicon hardware which controls these things in firmware.

Yes. As already stated.

The pmset command does offer these two items:

lidwake - wake the machine when the laptop lid (or clamshell) is opened (value = 0/1)

acwake - wake the machine when power source (AC/battery) is changed (value = 0/1)

sudo pmset lidwake 0

sudo pmset acwake 0

But I agree, I see no specific option to change the behavior of Apple Silicon MacBooks (Pro / Air) as described by PRP_53. But you can prevent power on when opening the lid and you can prevent power on when attaching AC power.

_aditya1008 wrote:

how to turn off autoboot in macbook m3 air?

As noted by PRP_53, not possible.

Well the author has failed to respond as of yet. The definition of what the author means by autoboot is still in question.

I've confirmed that not all power features are available on all Macs. pmset -g cap will list the capabilities of the hardware. I stand corrected on the lidwake / acwake. It's no longer available on Apple Silicon hardware which controls these things in firmware.

Same problem I facing with my MacBook pro M1 it automatically turned on when I shut down and down my lid when screen goes to black, so it automatically turned on even after down the Lid can anyone please help with this issue

The user has an Apple Silicon M3 Mac. So what you can do with pmset is irrelevant.

Sense the appropriate questions to OP have been presented

Let us all be patient for OP to offer some insights/ definition of autoboot

Then we all can move forwards from there 😎