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Set a one-minute display sleep time System
If you're like me and like to save as much battery as possible you might like this. You may have noticed that the shortest time for sleep is 5 minutes. this can be changed in the file /Library/Preferences/
  1. open up a terminal
  2. type 'cd /Library/Preferences' at the prompt
  3. sudo vi
  4. edit the numbers between the <integer></integer> tags.
  5. save your changes, logout and log back in.
I was only able to get the display to dim after a minute and then turn of a minute later. I tested it on the hard disk but have been unsuccessful; haven't tested it on system sleep.
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Set a one-minute display sleep time | 4 comments | Create New Account
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Take care of your Display Sleep time
Authored by: Anonymous on Nov 19, '01 12:32:12PM
While a display does wear off when it is always on and uses battery life on a laptop, it is probably not wise to reduce the display sleep time to a very short period as suggested.

The Problem is that the display backlight will wear off quite fast when your display turns on and off very frequently. I wish I would have knows earlier, as the maximum brightness of my iBook is a lot less then it used to be.


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thie works with hard disk
Authored by: ld50 on Dec 05, '01 02:02:35AM

i was able to get the hard disk to spin down
after a minute of inactivity using this method.
works great. save that battery


[ Reply to This | # ]
changed 10.1.15
Authored by: sphen on Jul 28, '02 10:34:33AM

I noticed since upgrading that my prefs didnt stick. The file to edit is here now:

[ Reply to This | # ]
changed 10.1.15
Authored by: jacob_hackamack on Jul 28, '02 12:33:05PM

Yes, I have also noted the change, as well as, I don't know if its just a program I had added prior or what, but an area for battery and ac, so you don't have to shutdown your HD after 1 minute if your on the AC, I don't know if it works, I haven't really kept my eye on it, but it is not implamented in the sys preferences.

[ Reply to This | # ]