Saving power is important, especially on mobile devices and laptops. Every CPU has a built-in feature to shut down different parts of a computer to reduce power needs. It’s up to the techs to make sure the power management settings are optimal for the users.
- So pretty much everything else can be handled in Windows, … but first, before we get into Windows, … I want to make sure we understand … that ACPI has power states. … And they're numbered S0 through S5. … Now, a lot of times when you go into BIOS, … you'll see things like wake on LAN at S5 … or something like that. … I want to make sure you understand what these S levels are, … 'cause you don't even have to know them all. … First of all, either ACPI is enabled or it's not enabled. … On most systems today it's just enabled … when you power up the computer. … You can't even turn off ACPI anymore. … So ACPI S level 0 basically means … ACPI is on, but nobody's using it. … We haven't got anything turning off, … or whatever might be happening. … The next level is going to be what we call ACPI level 3. … ACPI level 3 is what we call a sleep mode. … Now, when your computer goes into a sleep mode, … your CPU stops working, but your RAM keeps running. … So whatever is in RAM at any given moment, …
We are a CompTIA Content Publishing Partner. As such, we are able to offer CompTIA exam vouchers at a 10% discount. For more information on how to obtain this discount, please download these PDF instructions.