System sleep in OS X is a convenient feature that saves power while preserving your work flow. This option has been available in Macs and other PC systems for years, and is especially useful for laptops where you might wish to conserve battery power. While computer sleep is nothing new, there are some details of how it is implemented in OS X that may help you troubleshoot situations where sleep does not behave as it should.
For Mac systems sleep is governed by the system management controller (SMC), which has a number of variables it uses to manage when disks spin down, what GPU to use, whether or not various sensors are enabled, and options for managing sleep behaviors. Some of these sleep behaviors include when the display and system go into sleep modes (these are set in the System Preferences), whether or not the system will use hibernate mode (enabled by default on laptops) and where it will store the hibernation file on the system.
The hibernate mode and sleep image settings are listed here in the output of the pmset -g command (click for larger view).
(Credit: Screenshot by Topher Kessler/CNET)
To see these variables, open the Terminal and run the following command:
pmset -g
By default, the hibernatem... [Read more]
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