The Energy Saver in System Preferences has no effect.

, System Preferences, Hardware, Energy Saver

See if 'Wake for Ethernet Access' is enabled. If so, disable and see if there is a change.

, System Preferences, Personal, Desktop & Screen Saver, Screen Saver, check to see if the Screen Saver is set to longer than 20 minutes, or Never.

In theory, Energy Saver SHOULD override Screen Saver settings (and in fact it does warn you if Screen Saver is set to a longer time delay than Energy Saver) but sometimes it doesn't seem to work that way.

You have a corrupt

com.apple.systempreferences.plist

file,

Finder > Go To Folder

/Library/Preferences

search and find the file, there may be two of them and one is locked, remove the one you can to the Trash

Reboot and set your System preferences again.

 Cheat sheet to help diagnose and fix your Mac

https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

Perhaps you have some process keeping it awake for some reason. Have you installed any new stuff recently?

Try smc and pram reset.

Open terminal and copy/paste the following line, hit return, post the results:

pmset -g

Also post the files in the following places:

your login items

~/Library/LaunchAgents (in your home directory)

/Library/LaunchAgents

/Library/LaunchDaemons

/Library/StartupItems

And again in terminal the output from the following line (copy/pasteand hit reutrn):

kextstat -kl | awk ' !/apple/ { print $6 $7 } '

Maybe some of this info will indicate a possible culprit.

Alternatively, if that doesn't fix the issue, it might be a corrupt'

com.apple.PowerManagement.plist

which resides in /Library/Preferences/SystemConfiguration/.

good to know. thanks. 🙂

Don't know. Just move it to the Desktop and restart. Then, you'll know. That should set the Energy Saving settings to their defaults and recreate the file.

All .plist files should recreate when rebooted and the program started for it.

It's like Apple knew they could get corrupted or something. 🙂