Questions about with tracking and reducing power-drain for computers or devices.

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1answer
1k views

How to keep monitor off when logging in remotely

I'm managing an 8-core mac server (fully updated to Mac OSX 10.8.4, all other software is up to date). Multiple users can login remotely to use the machine. Whenever someone logs in remotely, the ...
1
vote
2answers
802 views

Is there any way to ignore a heat sensor on a macbook pro?

I recently replaced the ribbon cable which connects the top case assembly on my macbook pro 4,1 (early 2008). My keyboard is now working but unfortunately the fans are reving up to 6000 rpms and ...
1
vote
0answers
63 views

How to diagnose/fix error when booting a G5

I have an Apple G5 and it won boot anymore. When I boot my fan starts to spin like a madman and the screen stays grey. When I try to boot in Safe Mode using Shift-Command-V, I get the error message: ...
0
votes
0answers
412 views

How to select which disks are allowed to sleep?

There is an option "Put the hard disk(s) to sleep when possible" in Mac OS X's preferences: Is it possible to configure which disks Mac OS X can put into a sleepy state? For example, I want to ...
2
votes
3answers
2k views

How to keep Mac alive during internet connection/download

Since version 10.8.1, my Mac cancels the wifi connection and switches to standby mode, despite download. I can remember that the one advantage of the mac was that i don't have to do anything for ...
2
votes
1answer
747 views

OS X Mountain Lion: Change resolution automatically when on battery

I have a rMBP running OS X 10.8 Mountain Lion. I normally use the display at a 1680x1050. Is there a way to have the display automatically change resolution to the default retina when on battery, and ...
2
votes
2answers
442 views

Mac wakes on scheduled power event that recreates itself every day

At 2:14 every morning, my Mac wakes. Looking at the logs, I see it's a scheduled event, but nothing shows up in System Preferences > Power. When I go to terminal, and run pmset -g sched, I see ...
-1
votes
1answer
228 views

How to avoid a forced shutdown or crash when the MagSafe is plugged in and got loose?

The new MagSafe for the current Macbook Air isn't very strong for its magnetic force, so it can become loose easily. Today I left the Macbook Air unplugged and it went into sleep, and after I plugged ...
0
votes
1answer
181 views

What are some effective ways to save power when using my MacBook Pro?

I have an Early 2011 MacBook Pro (Core i7, 8GB RAM) with Mountain Lion (OS X 10.8.2). What are some effective ways to save power? I am looking to maximise use of the battery - from a full charge - on ...
2
votes
1answer
359 views

During an iTunes sync, are MacBooks prevented from going into sleep mode?

I want to know this as I sometimes leave my iPhone unattended while syncing and I want to make sure that there's no cut off to the iPhone sync.
0
votes
1answer
947 views

Macbook Pro Mid 2010 not powering up after smc update

Macbook Pro Mid 2010 after SMC update 1.7 shuts down and now by pressing power button front light turning on for a few seconds, optical drive makes it's usual noise but no activity on monitor happens ...
3
votes
2answers
6k views

While my MacBook sleeps, the network drops off?

I have just moved over to a Macbook Pro from my old Macbook. Thanks to the Migration Assistant, it was an easy task, but I am now having an annoying issue: I have both computers on with all the same ...
1
vote
0answers
775 views

Fusion Drive Setup: Possible to force the HDD to spin down as long as your reading from/writing to the SSD?

I'm considering to replace my optical drive in my MacBook Pro with an SSD. When using it as separate Volume, the advantage is that you can spin down the HDD, thus reduce noise and first and foremost, ...
1
vote
1answer
308 views

Will internal HDD spin down when a Mac is booted from another internal SSD?

On my MacBook Pro, I am planning on removing the optical drive and adding an SSD to the mix. Since Apple doesn't support this configuration, I don't find any official documentation covering SSD in the ...
0
votes
1answer
113 views

Are there any hidden settings to modify default system sleep conditions?

Is it possible in some way to modify conditions when OS X will go to sleep? In my opinion the time delay of system sleep is insufficient. Imagine the situation that we are in the middle of ...
1
vote
1answer
3k views

How much power does a mac mini uses?

I would like to know how much power would a mac Mini consume per month/year if: always powered, but under very low load web server OS, probably Ubuntu two drives: one SSD and one HD. model Early ...
3
votes
1answer
318 views

iMac sleeping even when set to never sleep

Running 10.7.5, I've got a fairly new iMac (6 months old) 27", set to never sleep, yet when I got in to work this morning it was asleep. How to fix this? Output from pmset -g in Terminal: Active ...
6
votes
1answer
22k views

What is the “wake for wifi network access” setting in energy preferences?

Can anyone explain the "wake for wifi network access" setting in energy preferences for me? I do not understand it.
0
votes
2answers
8k views

Have to reset the SMC on Retina Macbook Pro very often

Very weird problem. About 3/10 times the discrete GPU on the Retina MBP (Nvidia GT650M) does not engage when I launch a game. The performance for the game drops to as if only the integrated GPU was ...
8
votes
5answers
11k views

Mountain Lion aggressively hibernates

Recently, my MacBook Pro (mid 2012, 15 inch, 10.8.2) has started going into what seems to be hibernate mode after several hours asleep, whether it's plugged in or on battery. When I unplug it, it ...
7
votes
5answers
7k views

kernel_task consumes 500% CPU on AC power, sometimes

Typically, my kernel_task process uses 1-4% CPU and 100-700MB of memory. However, sometimes when I have the power adapter plugged in, the CPU usage jumps to around 500% (8 cores) and stays there until ...
3
votes
2answers
237 views

OSX Mountain Lion: Automatically restarts after showing screen saver a certain amount of time

Since I upgraded to Mountain Lion it happens to me every day when I enter the screen saver while having lunch it tries to restart the computer. I don't have any clue why this happens. If there is ...
1
vote
1answer
4k views

Can I make my external HD sleep automatically?

I have an external WD USB hard disk attached to my MBP which I use for backups etc. I've noticed that even when it's completely inactive, but the drive is mounted, that the disk is spinning constantly ...
1
vote
1answer
2k views

Mountain Lion display sleep function and screen saver does not activate

Since upgrading to Mountain Lion, the display sleep function appears not to work, and the screen saver is flaky. I can leave my machine for a couple of hours and when I come back the screen is as I ...
2
votes
2answers
7k views

MacBook Pro won't power on after SMC reset

Some water was spilled on the table and came in contact with my wife's Mid 2009 MacBook Pro near the MagSafe adapter causing the MBP to shut itself off. Based on some recommendations from the ...
1
vote
1answer
3k views

How can I force my laptop to shut down when I close the lid?

I'd like my Mac laptops to shut down completely when I close the lid. This is partly for convenience and partly for security reasons. I couldn't find a way to do this in the System Preferences (OS ...
1
vote
2answers
270 views

iMac display wakes up even when no one is using it

I have my iMac set to set the display to sleep after 15 minutes. I notice at night that, even when no one is touching the computer, the display will come on for a while and then to go back to sleep ...
0
votes
0answers
226 views

Can hard drives have their own sleep settings?

Is there a tool that will allow me to set the sleep settings on a per-drive basis? I've recently done the optibay mod on my MBP so I have an HD+SSD setup and I'd like to be able to make the magnetic ...
0
votes
4answers
6k views

How to fix my MacBook Pro that goes straight into sleep/hibernate?

I have a MacBook Pro (mid-2009) that I just installed Mountain Lion on. After the install everything appeared ok, but a day later it goes straight into sleep/hibernate whenever I turn it on. This ...
0
votes
4answers
5k views

Mountain Lion freezes after sleep on iMac (Mid 2007)

After upgrading to ML, my iMac freezes when going to sleep. The fan goes off but i can't not wake it up. Its that weird i need to unplug the power, and then i can start it again. Keeping the power-on ...
3
votes
0answers
196 views

Do Solid State Drives need Power Management? Do they need sleep?

Is there any positive (or negative) to checking the power management option "Put hard disks to sleep" when I only have a SSD drive installed? Is there any difference if I'm connected to another ...
5
votes
1answer
11k views

Disable Stand By Mode on Retina MacBook Pro?

I learned that the retina MacBook Pro has a Deep Sleep Mode that is initiated when left idle for a long time. This, however, causes my laptop to take about 3-5 seconds to wake up after it sleeps, such ...
5
votes
1answer
4k views

High fan speed and CPU temp with low CPU usage?

I've been having intermittent fan speed and high CPU temperature when my CPU usage is nearly 0%. I don't run any weird apps. If I put my computer into sleep mode and wake it back up, this fixes the ...
7
votes
2answers
3k views

How to not let the system sleep when putting display to sleep with Ctrl+Shift+Eject in Mountain Lion?

In Lion I always used Control ⌃+Shift ⇧+Eject ⏏ to put my display to sleep when I walked away from my computer. The system would continue running and not go to sleep. Now in Mountain Lion when I put ...
1
vote
1answer
277 views

How can I restart on a schedule, if network users are connected?

I want to schedule a nightly restart of my OSX media server, but I routinely have other machines in the house connected to this machine remotely (since it's also our TimeMachine system, iTunes ...
16
votes
2answers
8k views

Mountain Lion sleeps too aggressively

For me, Mountain Lion always seems to sleep whenever there is no user action, even when the computer is still doing something. In my case it always sleeps in the middle of running a batch operation in ...
1
vote
1answer
225 views

Preventing iOS devices from sleeping

Is there any straight forward way of preventing an iOS device from sleeping? The only way I found so far is to open the "Music" app and start playing (and muting the volume if I don't really want to ...
2
votes
4answers
3k views

Limit processor speed like in Windows

In Windows (Linux too), you have the very useful "Power saver" mode that limits the maximum frequency at which your CPU runs. Is there something similar in OS X?
2
votes
2answers
715 views

Disable Spotlight indexing, save battery life

I am using my laptop with very limited battery availability. I need to save as much battery as possible. I would like to disable Spotlight indexing, how do I do that? What else should I disable, ...
1
vote
1answer
478 views

Why does running Luxology Modo cause a marked increase in performance for other 3D graphics apps?

Original post is at the bottom, newest update at the top. ;) I didn't think to add this before, but you can download a 15-day trial of Modo for free if anyone want to try this for themselves. If ...
4
votes
1answer
85 views

Energy saver: do the battery settings apply during charging?

I have my Macbook pro 17 (early 2011, OSX 10.6.8) set to turn off the display at 30 minutes on AC, and 10 minutes on battery. I've noticed recently that if the battery is charging (the little battery ...
0
votes
1answer
161 views

Set MacBook Pro on energy saving mode

I have a 2008 MacBook Pro (last one before the unibody ones) and have been monitoring a the laptop temperatures for almost a day. I used Temperature Monitor to graph the changes in temp and correlate ...
8
votes
1answer
654 views

How can I tell whether a drive is asleep?

Is there an application or command-line utility for Mac OS X to query a hard-disk to see if it is 'asleep' or 'awake' right now? (i.e. as controlled by Energy Saver / pmset disk sleeping preferences). ...
0
votes
1answer
712 views

Does the hard disk sleep setting in Energy Saver affect drives in the optical drive bay?

If a second hard drive is mounted in the optical drive bay of a MacBook Pro, will it be affected by the Energy Saver setting for "Put the hard disk(s) to sleep when possible"? If it is affected, is ...
2
votes
0answers
49 views

Darken Background Illumination When There is No Windows

I have a MBP in a dualscreen setup with the laptops display as secondary. I'd like to know if there is an application that dims the display's illumination when there is no window drawn on the laptop.
1
vote
3answers
2k views

Prevent iMac from sleeping, for VPN login?

We have an iMac in the office, and I have been getting inconsistent access when trying to log in to it. The firewall isn't going down, since I can connect to the VPN. After discussing it with the ...
3
votes
3answers
739 views

Macbook Pro random shutdown

Has anyone experienced this problem? Does anyone have a solution? I have scoured the internets for solutions and found many different answers. I am on a Macbook Pro 6,1. The one that has worked for me ...
1
vote
1answer
681 views

When should I reset the SMC on a Mac?

I want to know when I should reset the SMC on a Mac. I have a very quirky G5 and was wondering if resetting the SMC would fix some of its problems.
1
vote
1answer
390 views

What does resetting the PMU do?

I am considering resetting the PMU on my Mac, but I'm am unsure what it exactly does. I know it resets date/time, but what other settings does it wipe?
1
vote
0answers
559 views

“2008 Mac Book Pro 15” Fan max speed, Battery not recognized , SMC reset makes it worse

I have a "15" Mac Book Pro 5,1 and after running it stone dead on battery once it wouldn't power on without holding down the power button, with battery and AC removed and then plug AC back in while ...