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

learn more… | top users | synonyms (3)

16
votes
2answers
7k 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 ...
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 ...
3
votes
4answers
1k 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?
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?
4
votes
2answers
1k 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 ...
1
vote
1answer
190 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 ...
6
votes
5answers
6k 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 ...
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 ...
1
vote
1answer
191 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 ...
1
vote
1answer
627 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.
0
votes
1answer
107 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 ...