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

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3
votes
1answer
4k views

How much power can be drawn from the lightning connector by a external device?

How much power can be drawn from the iPhone/iPad lightning connector by a external device? Update: The use case is a audio-related device for iPhone/iPads. It would require around ~100 mA at 3,3 ...
4
votes
4answers
858 views

Is there a way to shutdown mac when screen is turned off?

I have a mac mini, which is connected to a TV using HDMI cable. TV & mini are connected to separate power source, so that I can shutdown TV and mini independently as required. Primary use of mini ...
1
vote
0answers
156 views

Does APNS work over LTE, or only UMTS/GSM and WiFi?

Over at Android Enthusiasts, we are having a discussion of what's more battery-life efficient — having APNS over GSM or UMTS networks during sleep, as TS4264 appears to indicate (thus ...
1
vote
1answer
512 views

High Perf GPU notification on Mavericks

With OS X Mavericks, users are able to use Activity Monitor to view which apps are using the High Perf GPU, therefore, sucking more power from the battery. This is exposed by the 'Requires High Perf ...
0
votes
1answer
47 views

Energy saver 101 : sleeps after or when battery is at x hours?

Using Mac OSX on a macbook pro. in energy saver - battery tab : if i have sleep at 1 hour, does that mean the computer will sleep after an hour on battery OR when there is a about an hour of battery ...
6
votes
3answers
16k views

Difference between autopoweroff and standby in pmset

I just got a new Retina MacBook Pro 15". After getting some downloads interrupted due to the computer going to sleep (even on AC power), I started looking at the man page for the pmset command. I did ...
2
votes
0answers
1k views

MacBook Pro will boot only after a SMC reset

I replaced the hard drive in my MacBook Pro (mid-2010) with a SSD one. I installed Mac OS X 10.9. At first the installer wasn't able to find the new SSD drive, because of a error: "SerialATAPI device ...
1
vote
1answer
96 views

What could be preventing my backup script from running?

I'm having trouble getting a simple backup script to run. The following script runs most of the time, but occasionally it fails entirely (without printing out any log information). Is there something ...
2
votes
1answer
494 views

Can I configure a task to run while my MacBook lid is closed?

Can I use pmset or a utility like Power Manager to have a task (such as an arbitrary script or backup) run at a specific time while my Mavericks MacBook Pro's lid is closed? Are there perhaps pmset ...
0
votes
0answers
2k views

What are the different sleep modes on Mavericks MacBook Pros?

I'm confused about the different sleep modes on Mavericks MacBook Pros: PowerNap, App Nap, DarkWake, sleep, system sleep, display sleep, standby, hibernation, etc.? What do these terms mean and how ...
6
votes
2answers
2k views

What is the difference among the various event schedulers for OS X / Darwin?

I'm confused about the differences among the three (that I know of) tools for scheduling running of code on OS X / Darwin: cron launchcd pmset I understand that cron is largely deprecated, but it ...
0
votes
0answers
960 views

Repeated Kernel Panics & Freezing on Late 2012 Mac Mini 6,1. Help please with the Log

I've had massive problems with my Mac Mini recently. It has been freezing and rebooting after around 10 to 50 minutes use. It's a Late 2012 Mac Mini 6,1 with 8gb of memory. The problems got worse ...
3
votes
1answer
12k views

MacBook Pro not responding to power button

My Mac wont start up even with full battery and charger plugged in... There is no sound, no screen or any disk movement. The same thing also happened a few weeks back and when I took it to the repair ...
2
votes
1answer
271 views

How to pesistently configure a Macmini4,1 to boot after power failure?

I do have a Macmini4,1 (2010) and I want to use it as a server so it will always start even after a power failure. Please remind that I am running Ubuntu on it, not OS X. Still, based on what I ...
1
vote
1answer
131 views

Does setting the Computer Sleep setting to 'Never' prevent sleep? [duplicate]

I'm running OS X 10.8 Mountain Lion on several servers. We're about to ship them off to a colo provider, and I wanted to prevent them from sleeping. My question is, does setting the System ...
0
votes
1answer
114 views

delay after opening lid display dark until key pressed

okay so my MBP Mid 2010 was took a little tumble (it was in a felt sleeve which was inside a backpack) today and since has been acting weird. when i open the lid, the login screen does not come back ...
3
votes
3answers
2k views

Is InsomniaX working on Mavericks?

It seems to me that InsomniaX, a utility to let a MacBook stay awake when the lid is closed, is not working on Mavericks. Can anyone confirm for me?
6
votes
1answer
4k views

What do the “Energy Impact” numbers displayed in the new OSX 10.9 mean and how are they calculated? [duplicate]

I love the new energy tab in OSX 10.9 mostly because I love data about my machine. I'm curious how the energy impact is calculated, and what the number represents. It seems clear from using the OS ...
1
vote
1answer
1k views

Mac doesn’t go to sleep after inactivity

Before updating to Mavericks, my Mac would go to sleep after 15 minutes of inactivity, which is usually 10 minutes after I turn the screens off using Shift+Ctrl+Eject. However, since the update, the ...
0
votes
0answers
34 views

Is there a way to recognise active applications that are not being used so a script could shut them down?

Is there a way to recognise active applications that are not being used so a script could shut the down? I'd like to recognise an application that is running but has not accepted keystrokes recently ...
0
votes
2answers
979 views

Macbook Pro is unresponsive for about a minute when waking up. Is this normal?

Whenever I wake up my 2012 Macbook Pro after it's been asleep for a few hours, the screen turns on, but it is unresponsive for about a minute. During this time, the mouse cursor does not move at all ...
2
votes
1answer
237 views

Stop auto-dimming automatically

I've noticed my Mac didn't retain the brightness I set with the keys. How do you stop it from auto-dimming?
1
vote
1answer
1k views

Macbook air wouldn't turn on until after I reset the SMC. Does this indicate any further problems?

I put my macbook air to sleep this afternoon by closing its lid, as I usually do. When I got home a few hours later it wouldn't turn on and didn't respond to the power button being hit. I followed ...
10
votes
1answer
14k views

How to make a Mac (Macbook Pro) not hibernate?

I have already set in the Energy Saver of System Preferences that Computer sleep: on Battery Power, Never when plugged in, Never so if I close the cover of the Macbook Pro running ...
0
votes
2answers
122 views

MacBook Pro Hibernates Straight Away

Whenever my Mac goes to sleep when its on battery, it straight away saves its contents to the hard drive and powers off, going into a deep sleep. This gets really annoying when I walk away for 10 ...
1
vote
0answers
101 views

MacBook Pro Fails to Sleep Properly

I have a MacBook Pro 17" (late 2009 model) 2.8ghz Core2 Duo running MacOs 10.8.4 which has developed a problem going to sleep which I've been trying to isolate for the past several months. Here is one ...
1
vote
1answer
3k 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
2k 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
88 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: ...
1
vote
0answers
621 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
3k 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
933 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
674 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
294 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
224 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
597 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
2k 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
10k 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
1k 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
414 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
132 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 ...
5
votes
1answer
6k 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
437 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 ...
13
votes
1answer
43k 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
10k 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 ...
10
votes
5answers
14k 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 ...
10
votes
5answers
11k 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
450 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 ...
2
votes
1answer
6k 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 ...