Raspberry Pi Forums

apmsleep of the linux command is not found in Pi, is there anyway for me to enable it?

or the pi itself is already very low power no need to go into standby mode?

I want to use the pi as the embedded control system which requires to use very low power when not in used.

The RPi doesn't have an ACPI/APM BIOS so even if you did install apmsleep it would be 100% ineffective.

lilzz wrote:or the pi itself is already very low power no need to go into standby mode?

I want to use the pi as the embedded control system which requires to use very low power when not in used.

According to my plug-in power consumption meter, my Model B RPi - sitting doing 'nothing' - is drawing approx 0.02 amps from a 250v AC domestic power socket. So that figure includes any loss/wastage in the 250Vac-to-5Vdc power adaptor.

Do you have any realistic target for what "requires to use very low power when not in used" actually means, to compare with that?

The 'shutdown -h now' will put the RPi into low power halt state. To power off completely you need to unplug the power plug or cable. Or use manual or automatic switch on the supply line. Or build a power supply that can switch itself off - similar that can be found from desktop PCs but smaller.

Personally I like to switch off any electronics when I am absent - even if the standby current is low.

OK, 'shutdown -h now' will put it into low power mode. So how does it wake up?

lilzz wrote:OK, 'shutdown -h now' will put it into low power mode.

No, it puts it into a Halt state. The Operating System is no longer running.

So how does it wake up?

Power cycle it, or look up Wake from Halt.
http://www.raspberrypi.org/forum/viewto ... 29&t=24682
http://elinux.org/RPI_safe_mode