Energy Saver Preferences Not Saved in 10.8.2

The saver that refuses to save.
The saver that refuses to save.

Problem

In the Energy Saver preference pane of System Configuration in OS X 10.8.2, any changes made are lost upon restart.

Discussion

Here is an abridged list of things I tried that did not solve the problem:

  • Disk Utility repair permissions function
  • Various command line repair permissions functions on ~/Library and sub folders
  • Deleting com.apple.systempreferences.plist and many other .plist files
  • Setting and reconfiguring with pmset on the command line
  • Performing an SMC reset
  • Performing a PRAM reset

I searched through a bunch of forum posts, Apple articles and blog posts to no avail.

What I found was that this file

/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist

was being modified whenever I changed the values in Energy Saver Preferences, and for some reason it was getting overwritten or reset whenever I rebooted.

Solution (Workaround)

To prevent this, I locked (made immutable) the file with this command:

sudo chflags uchg /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist

And now the Energy Saver Preferences survive a reboot. ┬áIf I need to change them again, I’ll have to manually unlock the file, make the changes, and then lock it again, so this is just a workaround until I find out what is causing the problem in the first place. If you have any ideas, let me know.

 

5 thoughts on “Energy Saver Preferences Not Saved in 10.8.2

  1. This has not been fixed in 10.3. I manage over 50 computers at a community college and it is most annoying! Would love to find a solution to this.

  2. When I ended up doing a clean install of 10.8.3 for unrelated reasons, this problem magically disappeared, so I never did find out the root cause on my rMBP. I wonder if a clean install on one of your 50 machines would solve the problem, and then you could add the standard software changes one at a time to see what breaks it.

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