The Energy Saver in System Preferences has no effect.

Hi,
I have my Energy Saver preference set to turn off my monitor after 20 minutes of idle time. But the display never goes off.
Energy Saver used to work, now it doesn't and I have no idea why not, or what changed.
Any ideas?
Thanks!!

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.

Similar Messages

Mac Sleep Timer (through 'Energy Saver' in System Preferences) won't work

Hello,
I have a MacBook (13-inch, Mid 2009) running Mac OS X Snow Leopard 10.6.3,
and it has been installed with the latest software updates possible.
(The latest update is the 'Security Update 2010-003')
Previously I was using Mac OS X Leopard 10.5 on my MacBook,
and I can vaguely remember the timed computer sleep through Energy Saver would work.
That is, when the counter's time matches the amount of time I specified (e.g. 10 minutes), the computer enters sleep mode and displays a pulsing power light.
After upgrading to Snow Leopard I can barely remember the scheduled computer sleep will work as I don't really notice how it sleeps / I will shut down my MacBook before I go to bed.
==========
However, last night I was really tired and slept in front of my MacBook unconsciously.
When I woke up, I found that my MacBook didn't display a pulsing power light but a continuously-growing power light.
I tapped the trackpad and the display turned on, so I knew that my MacBook didn't go to sleep a whole night.
*What that means is that the Sleep Timer (through 'Energy Saver' in System Preferences) won't work.*
But the timed display sleep DOES work.
==========
After spending a whole day Googling,
I found that there are plenty of people suffering the same problem as me, although their Macs and OSs vary.
I also found an official support page from Apple concerning the related issue:
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
I tried the following methods but still can't resolve the problem:
_- boot my MacBook in safe mode_
_- use the 'Disk Utility' to repair Disk Permissions through booting my MacBook from the Mac OS X Snow Leopard Installation DVD_
_- reset NVRAM (Intel-based) (as PRAM is used by PowerPC-based Macs)_
_- reset SMC (System Management Controller)_
NONE of the above-mentioned methods can resolve the problem.
Althought I am sure that the Spotlight isn't indexing the hard drive, and I just start my computer and do nothing and wait for the scheduled computer sleep, the scheduled computer sleep just won't work.
In the other Mac forum, I saw someone suggest installing an application called PleaseSleep:
http://www.dragonone.com/products/macosx/pleasesleep/
It works.
But I really want to find out what caused this problem as this is a function shipped with Mac which is expected to work normally.
What's more, Apple is claiming to be a green Apple, right?
==========
Here's the log taken from 'Console':
- Sleep by closing the lid of my MacBook:
Apr 18 13:21:05 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback WILL sleep
Apr 18 13:21:05 Michael-Leungs-MacBook PleaseSleep[288]: Sleep notification received from the system
Apr 18 13:21:07 Michael-Leungs-MacBook configd[37]: network configuration changed.
Apr 18 13:23:21 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback will power on, Currenttime:4/18/2010 1:23:21.028 PM - Waketime:4/18/2010 1:23:19.410 PM = Deltatime:1.618421972
Apr 18 13:23:21 Michael-Leungs-MacBook loginwindow[25]: handleUnlockResult, Currenttime:4/18/2010 1:23:21.579 PM - Waketime:4/18/2010 1:23:19.410 PM = Deltatime:2.169138968
Apr 18 13:23:23 Michael-Leungs-MacBook configd[37]: Sleep: Success - AC 98 - Clamshell Sleep
Apr 18 13:23:23 Michael-Leungs-MacBook configd[37]: Wake: Success - AC 98 - EC LID0
Apr 18 13:23:23 Michael-Leungs-MacBook configd[37]: Hibernate Statistics
Apr 18 13:23:23 Michael-Leungs-MacBook PleaseSleep[288]: Wake notification received from the system
- Sleep by manually clicking the Apple logo in the upper left corner of the screen -> 'Sleep':
Apr 18 13:31:46 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback WILL sleep
Apr 18 13:31:46 Michael-Leungs-MacBook PleaseSleep[288]: Sleep notification received from the system
Apr 18 13:31:49 Michael-Leungs-MacBook configd[37]: network configuration changed.
Apr 18 13:32:04 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback will power on, Currenttime:4/18/2010 1:32:04.033 PM - Waketime:4/18/2010 1:32:02.720 PM = Deltatime:1.313067079
Apr 18 13:32:04 Michael-Leungs-MacBook loginwindow[25]: handleUnlockResult, Currenttime:4/18/2010 1:32:04.589 PM - Waketime:4/18/2010 1:32:02.720 PM = Deltatime:1.869303048
Apr 18 13:32:06 Michael-Leungs-MacBook configd[37]: Sleep: Success - AC 98 - Software Sleep
Apr 18 13:32:06 Michael-Leungs-MacBook configd[37]: Wake: Success - AC 98 - OHC1
Apr 18 13:32:06 Michael-Leungs-MacBook configd[37]: Hibernate Statistics
Apr 18 13:32:06 Michael-Leungs-MacBook PleaseSleep[288]: Wake notification received from the system
- Sleep by manually pressing control + eject, and the press 'Sleep':
Apr 18 13:34:17 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback WILL sleep
Apr 18 13:34:17 Michael-Leungs-MacBook PleaseSleep[288]: Sleep notification received from the system
Apr 18 13:34:46 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback will power on, Currenttime:4/18/2010 1:34:46.080 PM - Waketime:4/18/2010 1:34:44.720 PM = Deltatime:1.360466003
Apr 18 13:34:46 Michael-Leungs-MacBook loginwindow[25]: handleUnlockResult, Currenttime:4/18/2010 1:34:46.564 PM - Waketime:4/18/2010 1:34:44.720 PM = Deltatime:1.844347000
Apr 18 13:34:46 Michael-Leungs-MacBook configd[37]: PMConnection AirPort configd plug-in com.apple.powermanagement.applicationresponse.slowresponse 566 ms
Apr 18 13:34:46 Michael-Leungs-MacBook configd[37]: bootpsessiontransmit: bpf_write(en0) failed: Network is down (50)
Apr 18 13:34:46 Michael-Leungs-MacBook configd[37]: DHCP en0: INIT transmit failed
Apr 18 13:34:46 Michael-Leungs-MacBook configd[37]: PMConnection IPConfiguration com.apple.powermanagement.applicationresponse.slowresponse 567 ms
Apr 18 13:34:46 Michael-Leungs-MacBook configd[37]: network configuration changed.
Apr 18 13:34:48 Michael-Leungs-MacBook configd[37]: Sleep: Success - AC 98 - Software Sleep
Apr 18 13:34:48 Michael-Leungs-MacBook configd[37]: Wake: Success - AC 98 - OHC1
Apr 18 13:34:48 Michael-Leungs-MacBook configd[37]: Hibernate Statistics
Apr 18 13:34:48 Michael-Leungs-MacBook PleaseSleep[288]: Wake notification received from the system
- Sleep by _turning on the application called 'PleaseSleep' based on the settings from 'Energy Saver'_:
Apr 18 13:37:22 Michael-Leungs-MacBook PleaseSleep[288]: Application is enabled
Apr 18 13:37:29 Michael-Leungs-MacBook System Preferences[1136]: * AGCAttach() failed
Apr 18 13:37:31 Michael-Leungs-MacBook [0x0-0x58058].com.apple.systempreferences[1136]: Couldn't find any matches.
Apr 18 13:38:23 Michael-Leungs-MacBook PleaseSleep[288]: Checking sleep conditions...
Apr 18 13:38:23 Michael-Leungs-MacBook PleaseSleep[288]: Going to sleep...
Apr 18 13:38:23 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback WILL sleep
Apr 18 13:38:23 Michael-Leungs-MacBook PleaseSleep[288]: Sleep notification received from the system
Apr 18 13:38:56 Michael-Leungs-MacBook loginwindow[25]: loginwindow SleepWakeCallback will power on, Currenttime:4/18/2010 1:38:56.042 PM - Waketime:4/18/2010 1:38:54.720 PM = Deltatime:1.321902931
Apr 18 13:38:56 Michael-Leungs-MacBook loginwindow[25]: handleUnlockResult, Currenttime:4/18/2010 1:38:56.571 PM - Waketime:4/18/2010 1:38:54.720 PM = Deltatime:1.850627959
Apr 18 13:38:56 Michael-Leungs-MacBook configd[37]: PMConnection AirPort configd plug-in com.apple.powermanagement.applicationresponse.slowresponse 707 ms
Apr 18 13:38:56 Michael-Leungs-MacBook configd[37]: bootpsessiontransmit: bpf_write(en0) failed: Network is down (50)
Apr 18 13:38:56 Michael-Leungs-MacBook configd[37]: DHCP en0: INIT transmit failed
Apr 18 13:38:56 Michael-Leungs-MacBook configd[37]: PMConnection IPConfiguration com.apple.powermanagement.applicationresponse.slowresponse 708 ms
Apr 18 13:38:56 Michael-Leungs-MacBook configd[37]: network configuration changed.
Apr 18 13:38:58 Michael-Leungs-MacBook configd[37]: Sleep: Success - AC 98 - Software Sleep
Apr 18 13:38:58 Michael-Leungs-MacBook configd[37]: Wake: Success - AC 98 - OHC1
Apr 18 13:38:58 Michael-Leungs-MacBook configd[37]: Hibernate Statistics
Apr 18 13:38:58 Michael-Leungs-MacBook PleaseSleep[288]: Wake notification received from the system
- If I disable 'PleaseSleep' and only depend on the non-working 'Energy Saver', nothing happens.
==========
Looking forward to your replies! Thanks in advance!

Found this discussion by googling "com.apple.systempreferencescouldn't find any matches"...
One month ago I bought a brand new Macbook Pro 13", and after a couple of weeks I realized it wasn't sleeping on its own when it should, per the system preferences. (I did sleep when I chose "Sleep" in the menus or closed it... It just wouldn't sleep on its own, while open.) What was extra frustrating was that it was intermittent... It would sleep on its own maybe 1/3 of the time, but other times it would NEVER go to sleep. I deleted PowerManagement.plist, reset the SMC, etc... No luck.
I took it to the "geniuses" at the Apple Store, and the guy took all of five minutes trying to diagnose the problem. When my MBP wouldn't sleep on its own, he promptly replaced it with a new one. That was nice, but I actually would have preferred that he diagnosed and fixed it. (I think the store was so swamped with people coming in for service that day that they were doing anything they could to close cases and get customers out of there ASAP.)
Now, sitting here with my 48-hour-old MBP, I still have the problem. The other one was so new that I had barely put anything on it yet. The only applications I had put on it were MS Office for Mac 2011, Firefox, Chrome, and Adobe Flash Player. I've put Office and Flash Player on this one, but not yet Firefox or Chrome. That's it. No other customization or fancy business.
I looked into the Console just now, and I see the "Couldn'tfind any matches" entry popping up again and again. The last three seemed to pop upright around the time when my MBP should have gone to sleep on its own, but not down to the second, so it's hard to definitively point at that and say it's it for sure.
They need to fix this!!

I DELETED MY ENERGY SAVER FROM SYSTEM PREFERENCES !!! HELP!!!!!!

Today while checking out my new leopard operating system, I noticed how in the finder window there is a history option on the left. At first I thought it was just like internet history and I was just clearing the list. I trashed it....and now my ENERGY SAVER is gone from my system preferences. I accidentally deleted it without realizing it. Does anyone know how this can be recovered!?!?

OK, well in that case you must have lost everything that was listed in the smart folder. See the following about file recovery:
Basics of File Recovery
If you simply put files in the Trash you can restore them by opening the Trash (left-click on the Trash icon) and drag the files from the Trash to your Desktop or other desired location. OS X also provides a short-cut to undo the last item moved to the Trash -press COMMAND-Z.
If you empty the Trash the files are gone. Recovery is possible but you must not allow any additional writes to the hard drive - shut it down. When you delete files you erase only the directory entries, not the files themselves. However, the space occupied by the files has been returned to the system as available for storage. Writing to the drive will then eventually overwrite the space once occupied by the deleted files in which case the files are lost permanently. Also if you save a file over an existing file of the same name, then the old file is overwritten and cannot be recovered.
If you stop using the drive it's possible to recover deleted files that have not been overwritten with recovery software such as Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.

Energy Saver Freezes System Preferences

I am unable to put my G5 Power Mac to Sleep. I have attempted to make adjustments through Energy Saver but any changes freezes System Preferences. The spinning wheel begins and I need to Force Quit System Preferences. Any suggestions? Thanks in advance

First, Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them.
 Cheers! DALE

My energy save in system prederences unlocks itself when I restart my iMac snow leaopard. Why?

My energy saver in system preferences is unlocking itself whenever I restart or start my iMac (Snow Leopard). It never used to do that and I have no idea why it's doing it now. Does anyone have this problem and solved it? Thank you!

Hello,Sorry but Neil is partially incorrect,in System Preferences click on Security and make sure "Require password to unlock each System Preference pane"is checked off.Once this is checked off then everything will stay locked regardless if you log in or out of your Admin. account.
Message was edited by: RMT07
Message was edited by: RMT07Sorry you are correct I read that all wrong my mistake

Can't get MAC to shut down and start up via the schedule button in system preferences energy saver. Is there another way?

Can't get MAC to shut down and start up via the schedule button in system preferences energy saver. Is there another way?

Try this to start:
Repair the Hard Drive and Permissions
Boot from your Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

My macbook pro keeps going to screensaver after about 3 mins while watching a movie, i tried changing the time on the "Energy saver" menu in system preferences but it keeps doing it, how do i stop this?

my macbook pro keeps going to screensaver after about 3 mins while watching a movie, i tried changing the time on the "Energy saver" menu in system preferences but it keeps doing it, how do i stop this?

Deleting the System Preference or other .plist file
Install Caffine.
http://lightheadsw.com/caffeine/

My battery icon has disappeared from my menu bar at the top of the screen and the energy saver preferences simply says 'Could not load Energy Saver preference pane'

My battery icon randomly disappeared a few months ago from my menu bar and i have been unable to make it come back. After researching solutions online it soon became clear that all of the suggestions needed me to go into the energy saver preferences in the setting however the icon for the energy saver preferences is no longer there and whenever i click in the blank space where it used to be, it simply says 'Could not load Energy Saver preference pane'. As a result of this i never know how much battery i have left and so i just have to wait for the machine to die each time
The mac in question is a 13 inch 2012 macbook air that is running on OS Mavericks at the moment.
Any ideas on how to get the icon back?
- I recently discovered by accident that before i actually log into my account on my mac, when i am still on the page that contains the options of guest user etc. at that point the battery icon is displayed in the top right hand corner? Why is it that the icon exists there but not once i have logged it? Thankyou for any advice.

Nzdmalan the Adobe Creative Cloud application can be found in your Applications folder. Are you able to access the application itself? Is your computer managed by an I.T. department?

I was changing my desktop screen saver in system preferences screen protection. Now it says it is "Loading Images" and won't stop. The Colourful wheel goes around for ever and It does not stop. Can anyone help me?

I was changing my desktop screen saver in system preferences>screen protection. Now it says it is "Loading Images" and won't stop. The Colourful wheel goes around for ever and It does not stop. Can anyone help me?

Welcome to the Apple Support Communities
I have seen a lot of cases like your issue, and it's easy to solve.
First, open Disk Utility, select Macintosh HD in the sidebar and repair permissions. Sometimes, a permission can be damaged and it makes that an application doesn't work properly.
If that doesn't work, open Finder, select Go menu > Go to Folder, type ~/Library/Prefereces, delete "com.apple.desktop.plist" and "com.apple.systempreferences.plist" and restart

Can not receive Mac mail -error Outlook cannot find the server. Verify the server information is entered correctly in the Account Settings, and that your DNS settings in the Network pane of System Preferences are correct. Account name: "MacMail"

Can not receive Mac mail -error Outlook cannot find the server. Verify the server information is entered correctly in the Account Settings, and that your DNS settings in the Network pane of System Preferences are correct. Account name: "MacMail"
What are the correct mail account settings and more importantly the correct DNS settings
Thank you for any help you may be able to provide
Cheers
Chris (iMac i7)

Do not delete the old account yet. sign up for an iCloud account if you haven't.
I understand .mac mail will still come through. Do not delete the old account yet.
You cannot use .mac or MobileMe as type of Account, you have to choose IMAP when setting up, otherwise Mail is hard coded to change imap.mail.me.com to mail.me.com & smtp.mail.me.com to smtp.me.com, no matter what you try to enter.
iCloud Mail setup, do not choose .mac or MobileMe as type, but choose IMAP...
On second step where it asks "Description", it has to be a unique name, but you can still use your email address.
IMAP (Incoming Mail Server) information:
          •          Server name: imap.mail.me.com
          •          SSL Required: Yes
          •          Port: 993
          •          Username: [email protected] (use your @me.com address from your iCloud account)
          •          Password: Your iCloud password
SMTP (outgoing mail server) information:
          •          Server name: smtp.mail.me.com
          •          SSL Required: Yes
          •          Port: 587
          •          SMTP Authentication Required: Yes
          •          Username: [email protected] (use your @me.com address from your iCloud account)
          •          Password: Your iCloud password
Also, you must upgrade your password to meet the new criteria: 8 characters, including upper and lower case and numbers. If you have an older password that does not meet these criteria, when you try to setup mail on your mac, using all of the IMAP criteria listed above, it will still give a server error message. Go to   http://appleid.apple.com         then follow directions to change your password, then go back to setting up your mail using the IMAP instructions above.
Thanks to dpepper...
https://discussions.apple.com/thread/3867171?tstart=0

I cannot open the general pane in system preferences. I get a message saying there is an error. Any suggestions

I cannot open the general pane in system preferences. I get a message saying there is an error. Any suggestions?

The first thing I would suggest is for you to go to the folder containing your catalog, using your system browser. There will be a folder that has the extension .lrdata. Delete that folder, and then try to start Lightroom. If that doesn't work, replace your catalog with your most recent backup.

Interesting Issue with Screen Saver in System Preferences

Sorry for posting what might be a simple fix, as I thought it would be such, but apparently I just can't seem to figure this out. (as I trouble shoot for Pro Apps support requests every day at the office, but it's always the simplest items that seem to get us for some reason)
Just recently assisted installing Snow Leopard (Mac Box Set) on my sister's machine, clean install, and was in the process of updating her screen saver the way it was previously, Cycling through her Photos in iPhoto. When I first selected iPhoto within the screen saver system preference pane, it would give me a message saying that there were no photos selected/available. Yet, when I opened iPhoto '08, all her photos where all coming up as expected. No matter how many times I tried to select iPhoto in the screen saver pane, it wouldn't come up.
I figured I'd follow the request it was giving me, about using the icon at the bottom of the pane to manually add the "Pictures" folder where they all reside. Instead of just adding the "Pictures" folder to the side bar, it now shows ALL various sub-folders in the side bar list. (making the list about 100x longer than original)
I figured I'd try reversing what I did, selecting the various photo folders/sub-folders and use the to remove them from the list, but each of the various items listed all have the button disabled and cannot be removed. I then made several attempts to delete any/all preference files that were associated with *screensaver* in the various *.plst file namings. Though, no matter how many, or how many times I removed all the obvious screen saver *.plist files I could find, even after emptying the trash, and starting System Preferences once again, the HUGE list of photos were still showing up in the Screen Saver pane within System Preferences.
I appreciate any advice and/or guidance in how I might be able to remove the extra photo folders from the Screen Saver Sys Preferences side bar, and thank you very much in advance for taking the time thus far.
Best Regards,
-James-

How about the system preferences?
com.apple.systempreferences.plist
R

Strange behaviour of the Energy Saver settings

I noticed that the two sliders in the Energy Saver settings seem to work in tandem. If I set the Display to "Never shutdown" (I used this as I don't want my display/TV to go off in the middle of a movie as the mac sees there are no user interactions), and then try to adjust the sleep timer to anything (15min, 30min, etc.), it aligns the slider for the Display at the same point!
Is it happening only on my mac or is it the way it works for others?

That would be the simple logic. But, the scenario I mentioned is also a logical one. I have noticed that when I am watching a long Youtube video or an online movie from sites like Jaman, the screen would go off even though the system access is alive. At that time I have to scramble to the mouse/kbd to reactivate the display.
At the same time, I want to put the mini to sleep after 30min of inactivity. Hence, I want to set the sleep timer to 30min and the display to "never".
The energy saver settings show two separate sliders and there is no indication that they are attached at the hips.
Since it works this way for you as well, then I am not doing something weird. I think this is a bug in the OS.

[help] can't find "processor performance" option in the energy saver

hello....i've just bought my new macbook white 2.0 Ghz. the Mac OS version is 10.5.6
*i can't find any option to change my processor performance* on the "energy saver preferences"....here is the screenshot
it's odd when compared to the screenshot from apple support page
http://km.support.apple.com/library/APPLE/APPLECAREALLGEOS/HT3092/HT30923b.jpg
please help me on this, i can't perform image editing well when the battery get low....thanks a lot

On PowerPC machines, there is an option specifically for Processor Performance, while on Intel machines, the only option is for the entire computer - Better Energy Savings, Normal, Better Performance, or Custom. These can be selected for both on power adapter and battery and affect not only the processor, but also the display, sleep, and hard drive.
On 10.5.6, part of the update removed the option to change power settings from the menu bar drop-down menu - perhaps that is what you are looking at.

TS4291 My system preferences has only Mobile me available. No icloud. What to do?

My system preferences has only moblie me available, no icloud. when i click on mobile me I get the message "an error was returned for the server. please try again later".
How do I get the system preferences to change from mobile me to icloud?
Logging in to my icloud account works OK.
Macbook pro OSX 10.6.8

The minimum requirement for iCloud is Lion 10.7.2 (Mountain Lion preferred): the iCloud Preference Pane does not appear on earlier systems - the MobileMe pane appears on Lion and earlier but is non non-functional - you cannot now open or access a MobileMe account.
You can set Snow Leopard up to access the email on an existing iCloud account which has been set up on a compliant device, and you may be able to sync iCal using an unsupported (and possibly unreliable) hack, but no other facilities will work. You cannot open an iCloud account on Snow Leopard.
This page outlines the limited use you can make of an existing iCloud account with Snow Leopard:
http://www.wilmut.webspace.virginmedia.com/notes/icloudSL.html
To make full use of iCloud you will have to upgrade your Mac to Lion or Mountain Lion, provided it meets the requirements.
The requirements for Lion are:
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space
To purchase it you will have to ring Apple at the number given at the bottom left of this page.
The requirements for Mountain Lion are listed here:
http://www.apple.com/osx/specs/
It is available from the Mac App Store (in Applications). (If you are currently pre-Snow Leopard you will have to upgrade to that to access the Mac App Store: it's available in the online Apple Store.)
You should be aware that PPC programs (such as AppleWorks) will not run on Lion or above; and some other applications may not be compatible - there is a useful compatibility checklist at http://roaringapps.com/apps:table

The Energy Saver in System Preferences has no effect.

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