Mac OS X 10.6: Energy Saver preferences
Use Energy Saver preferences to set options that control your computer’s energy use. If you have a portable computer, these options also help you extend your battery’s life.
For example, you can set your computer, or just your display, to sleep automatically when it’s inactive for a period of time. If your computer is in the middle of a task that you want to finish, you should set only the display to sleep.
The options available to you depend on the computer you’re using. Some options aren’t available on all computers.
Select an option to adjust the tradeoff between battery life and graphics performance. You need to log out and then log in again for the change to take effect.
Battery, Power Adapter, and UPS
Click one of these buttons to choose which group of options to change. Your computer will use that group of options when it’s getting power from that source.
You see the Battery button only if you have a portable computer. You see the UPS button only if your computer is connected to an uninterruptible power supply.
Put the hard disk(s) to sleep when possible
Select this option to put the computer’s hard disk to sleep whenever it’s inactive.
Wake for network access
Select this option if you want other users to be able to access your computer’s shared resources, such as shared printers or iTunes playlists, even when your computer is in sleep mode.
Slightly dim the display when using this power source
Select this option to reduce the brightness of the display while the computer is using the battery.
Automatically reduce brightness before display goes to sleep
Select this option to always reduce the brightness of the display before the display goes to sleep.
Start up automatically after a power failure
Select this option to always start up your computer after a power interruption.
Restart automatically if the computer “freezes”
Select this option to restart your computer after it stops responding or has a kernel panic.
Show battery status in the menu bar
Select this option to display your battery’s level of charge in the menu bar. If your computer is plugged into an electrical outlet, the icon indicates whether the battery is charging or is fully charged.
Click this button to set a daily schedule for putting your computer to sleep or turning it off and on.