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

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9 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 ...
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0answers
17 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 ...
0
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1answer
34 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 ...
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0answers
15 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 ...
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0answers
42 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 ...
1
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1answer
25 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 ...
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0answers
37 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 ...
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0answers
21 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 ...
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0answers
17 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 ...
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1answer
50 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 ...
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1answer
106 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 ...
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0answers
16 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 ...
1
vote
1answer
56 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 ...
8
votes
1answer
557 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 ...
1
vote
0answers
60 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
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1answer
39 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 ...
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0answers
164 views

My Macbook Pro dies randomly, doesn't start, and Apple couldn't solve it

I brought my MacBook Pro, retina, 13" late 2013 to the Apple Store to find out what's wrong. They couldn't replicate the problem, therefore they couldn't give me any answers. I know of others who have ...
1
vote
1answer
80 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
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1answer
53 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
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0answers
119 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
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1answer
134 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 ...
2
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3answers
200 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 ...
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0answers
205 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 ...
3
votes
2answers
61 views

Don't charge iphone when plugged into macbook?

Is it possible to temporarily keep your iPhone from draining the macbook battery? When I'm out and about I sometimes want to connect my [nearly empty] macbook to my [not so empty] iphone so I can ...
1
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0answers
102 views

MacBook Pro doesn't detect power supply

My MacBook Pro (early 2009) doesn't detect when the power supply is connected and doesn't charge. It behaves as if the power supply was not connected to the MBP. It has 56% battery left and runs fine ...
0
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0answers
113 views

Only sleep MacBook Air when lid is closed

I have the following power management settings defined for my MacBook Air. Shantanus-MacBook-Air:~ shantanutomar$ pmset -g Active Profiles: Battery Power -1* AC Power -1 Currently in ...
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1answer
149 views

Only hibernate when closing the lid, display sleep otherwise?

I am looking for a way to hibernate (i.e. RAM saved to HDD then turned off) only when closing the lid. When the lid is opened, I expect OSX to simply turn off the screen after X minutes (i.e. ...
1
vote
1answer
110 views

How to change “Automatically reduce brightness before the display goes to sleep” in Yosemite?

A few OS X releases ago, there was a checkbox in the Energy Saver settings for "Automatically reduce brightness before the display goes to sleep". This doesn't appear to be there any more, and hasn't ...
1
vote
1answer
638 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 ...
9
votes
1answer
2k 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 ...
3
votes
2answers
862 views

Can I use a Mac mini without the power brick?

I don't have the power brick for my Mac mini with me but I have cord that plugs into the back of it, can I use it without and plug directly into the wall? Any harm? The model is A1347
1
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0answers
230 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 ...
0
votes
1answer
3k views

MacBook Pro battery percentage jumping down and up

Recently, my 2011 MacBook Pro 13' produces strange instantaneous jumps in battery percentage. Sometimes, when it is discharging, it drops by ~40% (and if it was near or at less then 40%, it shuts down ...
0
votes
0answers
869 views

Resetting SMC on a Macbook Pro

About a couple of weeks ago, I tried turning on my Macbook Pro and it seemed completely dead. I plugged in the power cable but it still didn't work. Since it's not under warranty anymore, I opened up ...
0
votes
1answer
140 views

How to know if (and when) a shutdown occurred due to power outage

I have a Mac in a remote location that operates as a server. It's configured (from Energy Management) to automatically power up in case of blackout as the power comes back. How can I tell if a power ...
2
votes
1answer
176 views

Early 2011 MacBook Pro SMC firmware update question

OS has been upgraded to Mavericks. Can I still run the SMC firmware update 1.7 said to be for OS 10.75 and 10.82? Would it hurt anything to try this firmware update with the later OS?
0
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2answers
12k 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 ...
1
vote
1answer
465 views

MacBook Pro only boots to grey Apple screen with spinning loader

My MacBook Pro boots to the hated gray screen. Things I have tried to fix this include: Booting with CMD-R (boots to a grey screen) Resetting the PRAM (boots to a grey screen) Resetting SMC (boots ...
0
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1answer
183 views

Why does fan increase slowly its speed at boot and system is so slow?

I am given a MacBookAir5,2 [A1466 (EMC 2559)] that is very slow. To give you an idea, a sequence of: Power on Log in and loading the desktop Power off from the menu takes around 10 minutes. The ...
4
votes
3answers
1k 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 ...
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 ...
3
votes
1answer
392 views

Why Does My MBA Close All My Apps After 5 Mins Idle?

Sometimes if I walk away from my MBA without locking the screen and I return I'll be faced with a login screen. Once I login all my apps I had open are now closed. Sometimes I'll close my MBA lid and ...
0
votes
1answer
436 views

Macbook's “Internal Memory Card Reader” uses 896ma/900ma doing nothing, is this normal?

One a new mid-2014 macbook pro: Internal Memory Card Reader: Product ID: 0x8406 Vendor ID: 0x05ac (Apple Inc.) Version: 8.20 Serial Number: 000000000820 Speed: Up to 5 Gb/sec ...
1
vote
1answer
36 views

How can I determine what kept my macbook pro awake until the battery drained?

I left my laptop unplugged last night and woke up to 0% battery. This is not usually what happens. Is there a way I can find out, this time or next time, what caused that? I assume something was ...
1
vote
1answer
43 views

really bad power consumption on mid-2013 MacBook Air

I'm getting a really bad power consumption on my mid-2013 MacBook Air 11" w/ OS X 10.9.4. I think the issue is that I have too many tabs open in Safari and SeaMonkey, and they're all taking a lot of ...
0
votes
0answers
177 views

2013 Macbook Pro won't power on or wakeup until SMC reset each time.

I recently got a kitten who likes to walk up and down my macbook. I've been pretty good at keeping her off so far, but yesterday she started to trample across the keys. I lifted her off and closed the ...
2
votes
1answer
24k views

SMC Reset Won't Work on Macbook Pro Retina mid-2012

I have followed all the correct steps for carrying out an SMC Reset, however my Mac continues to boot normally. The issues I currently am dealing with are: Slow performance Battery light on power ...
0
votes
1answer
252 views

Is it possible to “shut off” battery charging in OSX [duplicate]

Is it possible to "shut off" battery charging in OSX with an application rather then physically. Could this be done with AppleScript (I doubt it) or will need to be obj-c cocoa application? ...
2
votes
1answer
583 views

Is my SMC damaged?

I have a Macbook Pro running 10.9.3 (13D65), Boot ROM Version: MBP55.00AC.B03 SMC Version (system): 1.47f2 The fans are always running at full rpm and the kernel task used to take up 90% of the ...
0
votes
1answer
3k 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 ...