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

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0
votes
1answer
21 views

Does a black screen save battery on a macbook?

I've seen some similar questions about iPhone on this site, but none of them focus on macbook, so here comes this one. The picture below is a screenshot of my current desktop, with menu bar and dock ...
0
votes
1answer
50 views
+100

Sleep/wake Mac mini by pressing power button

I have a Mac mini that is on my network but not connected to any displays or input devices. It's running El Capitan. I want to be able to put the Mac to sleep and awake it as easily as possible (i.e. ...
0
votes
1answer
60 views

MacBook Pro won’t turn on, even after SMC reset

While I was doing some basic file management in the Finder, my MacBook Pro (mid 2012) suddenly went black. It wouldn’t turn on, even after long-pressing the power button or resetting the SMC (System ...
1
vote
2answers
3k views

MacBook Pro Mid 2009 does not boot without resetting system management control (SMC)

Today i started my macbook pro and after some seconds it stopped working (just turned). I was not able to start it again. After some apple support search I found a page that described how to reset the ...
1
vote
1answer
272 views

How do I get rid of this power assertion from a dead process?

I have the screensaver on my MacBook set to kick in after two minutes of inactivity and require a password immediately after it does. Normally, this works fine, but in the last week or so, the ...
11
votes
2answers
3k views

Sleep timeout missing from the energy saver preferences

I have two Macbook Pros running on Yosemite. The first one is a 17 incher from 4 years ago. I'm able to set the time that it sleeps. The second one is a 15 incher retina made this year. In its energy ...
0
votes
0answers
247 views

My MacBook Pro dies randomly, does not start, and the Apple Store employees did not resolve the issue

I have a Late 2013, 13" MacBook Pro with Retina display. I haven't had any trouble with it until a few weeks ago, when the volume keys would randomly toggle without me touching them. That happened ...
4
votes
1answer
111 views

Persistently or aggressively enabling Low Power Mode

I love the Low Power Mode feature. When I'm travelling or in other situations where reliable communication is more important than user experience, I want to always have it enabled, sometimes for days ...
0
votes
1answer
42 views

How to make my Mac sleep when I close the lid while connected to an external display? [duplicate]

Having an external monitor connected prevents my Mac from sleeping when I close the lid. Is there any way to opt out this feature?
0
votes
0answers
52 views

Internet access keeps using significant energy

In the last 2-3 days my battery has been draining much faster than usual, and Firefox is the app that keeps using significant energy. I am running an up-to-date version of Firefox on OSX 10.9 and have ...
0
votes
0answers
84 views

My Macbook Air 2015 keyboard and trackpad not working after login

My MacBook has El Capitan OS X installed. Keyboard and trackpad worked on login screen and boot (not working in recovery and after login). I performed the following steps, but still keyboard and ...
0
votes
0answers
33 views

Disable idle sleep within a shell script

How can I use caffeinate or pmset within a shell script to prevent my laptop from sleeping and interrupting the script? Something like: #!/usr/bin/env bash # disable idle sleep # rsync ... # more ...
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 ...
14
votes
2answers
51k 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
0answers
17 views

Is there any hacks to enable 'Wake for Wi-Fi network access' on battery power?

Is there any way to enable 'Wake for Wi-Fi network access' when machine is on battery power?
1
vote
1answer
73 views

My Macbook Air fan is really loud

My fan is running really loud. I have tried resetting the SMC and it didn't work. I have no applications running and my mac is not hot. If you have any idea what is wrong please help me!
0
votes
2answers
1k views

MacBook Pro late 2011 had GPU problems

I have a MacBook Pro late 2011 and yesterday my external screen suddenly showed glitches on the screen; much like the screenshots you see from other 2011 MacBook Pro's that have a failing GPU. As I ...
5
votes
3answers
4k 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 ...
0
votes
0answers
11 views

What happens when PCIe boost circuits are overloaded?

In my understanding, the 2010 Mac Pro is rated for 75W of power for each PCIe slot, plus 75W for each of the two 6-pin boost (aux) circuits. I know it's possible to exceed these limits, because I do ...
0
votes
0answers
42 views

display will not wake when using external monitor

I am using a macbook air. It worked fine until recently. As far as I know I did not change anything. There are two problematic behaviors: Lid open: when waking, the external monitor does not work....
0
votes
1answer
145 views

CPU System agent core (TC0E/TC0F) running very high

When my MBP (Retina, 13", Early 2015, identifier MacBookPro12,1) is under load, could either be CPU load or "bus-load", ie wifi, usb, webcam etc the CPU System Agent Core-sensor shows a very high ...
1
vote
1answer
7k 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 10....
1
vote
0answers
64 views

Why a sudden increase in CPU when battery low?

My Macbook Pro (Retina 13" late 2013, OSX 10.10.5) has fine battery life overall - this is not the problem. However, when the battery drops below about 8%, and before I normally get any "your ...
0
votes
0answers
22 views

Limiting Mac Pro (late 2013) power draw

I'm planning to buy a trashcan mac pro, but I have strict limits about power draw. Is there any trick to limit cpu frequency? You can do so quite easily, for example, in windows and linux. Limiting ...
1
vote
1answer
41 views

Trying to wake my Mac using Apple / Power Manager Script triggered by Folder Actions

I've been trying to tweak the following script to achieve this. (original script) tell application "Power Manager Scripting" tell workshop set myEvent to make new event with properties {id:"...
1
vote
1answer
727 views

How to enable “Click-to-play” in Google Chrome Version 43.0.2357.124 (64-bit)?

I run Google Chrome Version 43.0.2357.124 (64-bit) on OS X Yosemite. I want to enable Click to play option, mainly because I would like to lower the power usage of Google Chrome and Google Chrome ...
0
votes
0answers
58 views

OSX Activity monitor (energy) shows terminated terminal app with high average energy impact

I use my macbook like desktop (always connected to electricity) 95% of the time, so I never noticed this before. However, I had to use it on battery last few days and it surprised me how short the ...
0
votes
0answers
35 views

Why can't I turn on my MacBook after resetting SMC

Lately there've been some problems with the charger of my MacBook 12 inch. I searched on the internet and I was advised to reset the SMC by shutting down the MacBook, pressing shiftalt/optctrlpower at ...
0
votes
0answers
23 views

How can I SMC Reset with this issue?

Okay so my friend gave me his old mid-2010 MacBook Pro. It has an aftermarket battery in it, the first one died and after his friend put the aftermarket one in it never started. I did the cycle where ...
1
vote
1answer
60 views

mid-2012 Macbook Pro Retina 15" won't recognize new adapter

I recently bought a new power adapter off Amazon, and it worked with my mid-2014 MBP at work and my colleague's mid-2014 MBP, but not my mid-2012 MBP Retina 15" (which, frustratingly, it was bought as ...
6
votes
2answers
6k 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 ...
4
votes
1answer
14k 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
0answers
63 views

Darken Background Illumination When There is No Window

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.
0
votes
1answer
137 views

High fan, No battery symbol, Battery not charging on Macbook Pro Mid 2009

Recently, my MacBook Pro has had the following issues: If the battery dies, I need to do an SMC reset for it to even start up. When it does, the fan is running at high speed and there is either no ...
1
vote
0answers
17 views

Do not reopen windows/applications when battery down

When my battery of my laptop is empty, my computer falls out. It first tries to dump memory to the SSD in order to reload from there the next time. However, sometimes this fails and it has to do a ...
8
votes
3answers
20k 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 ...
1
vote
1answer
65 views

MacBook Pro (late 2013) w/ Yosemite & FileVault won't boot: LCD light only, no other activity

After lid-sleeping my machine with ~10% battery left, a few hours later, attached to AC power, it would not wake from lid-open, keypress, or short power-button-press. After doing a long-power-button-...
8
votes
1answer
603 views

Is there a way to force “low power” graphics?

Is there a plist or hidden config to set my graphics/energy preference to "Always use low power/ integrated graphics"? Seems like energy saver preferences only allow choosing between: Smart auto ...
5
votes
3answers
2k views

Don't Sleep Network Connection / VPN

If I let my computer sleep my VPN connection seems to die. Mac shows it as still being up, but nothing over the VPN works until I reconnect and disconnect. I am happy to have a my monitors sleep, but ...
2
votes
3answers
236 views

Is there a way to tell how long your Mac was turned on on a distinctive day?

I would like to know how long my MacBook Pro was on today - total uptime for the day. I just bought it, and I thought the battery was bad but it went on for longer than I thought. Of course, I wasn't ...
1
vote
0answers
74 views

New Battery: Runs out at “10% left”

I installed a new Apple battery in my MacBook Pro (13-inch, Late 2011) myself (bought the battery new from iFixIt). Installation worked great, extra 4 hours of battery life - fantastic. Then I ...
0
votes
1answer
53 views

Battery cannot charge fully

I replaced battery on my MBA mid 2011 (A1369). Here is the report by coconut(the same appears in system report): I bought no name battery from china and changed it personally (here they ask about ...
0
votes
1answer
4k views

Having trouble with a SMC reset

I'm having trouble with my built in iSight and I'm trying to reset the SMC. My MBP has a non-removable SMC, so the instructions ask me to press CMD-SHIFT-ALT-POWER at the same time, release it at the ...
0
votes
2answers
14k views

Can't power on without SMC reset whilst holding power

Grabbed out my old unused White Macbook 13" Mid 2009 (Macbook 5,2) because I'd like to donate it to someone. However, it wouldn't power on or charge (no light on the MagSafe adapter). I worked out ...
12
votes
1answer
16k 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 ...
1
vote
1answer
97 views

Do I need NVRAM/SMC reset to restore a used MacBook Air to defaults?

I've bought a used MacBook Air (Mid 2013) running Yosemite and I'd like to restore every setting to defaults, as in, start over with a fresh clean OS. What are the things I have to run to make sure ...
0
votes
1answer
55 views

Keep Mac ON for background work with minimum power

Say I am doing a long download. How can I keep the Mac stays sufficiently awake but with minimum power usage? I would also like minimum power when: I am using it as a surveilance camera. I want it ...
0
votes
0answers
145 views

Can I configure OS X's built-in UPS support to work with an older APC SmartUPS?

I have an APC SmartUPS 1400 which works great as a UPS. It has a serial port which can be used to manage it using RS232, but the automatic UPS support in OS X doesn't recognize it as a UPS when I ...
0
votes
1answer
183 views

Macbook Pro with abnormal CPU usage and unrecognised battery. How to alternative SMC reset

This Macbook Pro (15" circa 2012) is giving me trouble. After a slight water spill incident, I removed and replaced the hard drive, optical drive and battery (warning sticker ignored). After another ...
0
votes
0answers
283 views

How to stop OS X from system sleep when the Display sleeps?

On OS X Yosemite I found that all operations interupt once I switch of the monitor for a while. Most notabaly copy processes of large files, simply pause. Every time OS X puts the Display to sleep (or ...