How to get back hibernation?

How did you turn off hibernation? Generally, just do the same, but in reverse or with one different setting. For instance, if you did it via a Terminal command, usually you'll change TRUE to FALSE, 1 to 0, or something similar.

jW

 

It will just recreate the file. Also, look into the pref pane "SmartSleep". It allows you to easily set your sleep mode.

 

It's 3rd party. http://www.jinx.de/SmartSleep.html

 

It won't change your battery life. Once the MBA writes the sleepimage, it goes into the exact same sleep mode it goes into right now. The sleepimage is really only for when it runs out of power, or goes into deep sleep mode just before running out of power.

 

You could set your Macbook Air to hibernate only. In this mode it writes the contents of the ram to the disk then turns off the system. Then when you press the power button to turn it back on, it'll read in the disc contents and put you back to where you where. It uses no battery life in hibernation only mode.

 

Sage advice.

I use mine this way as well. It also seems a bit faster than sleep.