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Questions tagged [power-management]

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

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7 views

Mac screen stays lit on login prompt

My 2013 iMac running Mojave 10.14.3 has had this problem for a number of years and spans a few OS upgrades. When in locked mode, the screen can stay lit indefinitely, until I hit Esc. Behavior is ...
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0answers
23 views

Why are none of the USB ports on my 2017 non-TB macbook pro working?

A while back, one of my USB ports on my 2017 non-TB macbook pro stopped working. I went to the apple store and the guy told me nothing other than “you should’ve gotten apple care”, so I just went ...
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0answers
13 views

Resetting screen brightness setting in touchbar MacBook Pro during boot

Due to a series of unfortunate events, my 2018 15” MacBook Pro found itself out of battery and with screen brightness set to zero. I should also mention that I have FileVault full disk encryption ...
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2answers
38 views

How to make a Macbook Pro lock and not sleep when connected to power? [duplicate]

My 2018 MacBook Pro is connected to external displays and peripherals via a Thunderbolt 3 dock. When I step away from my desk I lock the computer by pressing ctrl+cmd+Q on my external keyboard. This ...
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0answers
16 views

Suspend a program when on battery power [duplicate]

I’m doing some long-running, CPU-intensive work. This means that I am tethered to a power outlet at all times. What I’d like to do is ask macOS to suspend a particular program when I’m on battery ...
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1answer
28 views

Is this energy usage for safari normal?

I was checking my activity monitor for Safari, and I see this number as its average energy usage. Is it normal?
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0answers
38 views

What is this “Screen Shot” app using so much battery?

The battery on my MacBook Pro drains very quickly compared to what other people report. When I'm running Slack, lots of Chrome tabs, and Docker for Mac and everything, that's to be expected. ...
3
votes
1answer
33 views

SMC sensors failure while running on battery

I have problem with SMC in MacBook Air 2016. While running on battery, data from SMC module freezes. In iStat Menus temperatures from sensors, RPMs, current meters and voltage meters from CPU aren't ...
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2answers
53 views

13" MacBook Pro 2017 randomly shutting down

I bought a new Mac and have had it it for like 1 week now. I noticed it turns itself off at 8% but I wasn't worried. Then it started shutting down on like 17%-20% cca. When you plug charging cable ...
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1answer
54 views

How to disable App Nap in 10.13.6?

I'm trying to disable App Nap for Chrome, but I can't find the checkbox anymore. Anyone know how to disable App Nap for a specific app in 10.13.6?
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0answers
23 views

Macbook Pro SMC reset

I have a macbook pro 15" late 2013, I removed my dead battery and I am waiting for a new one from ifixt. Do I need to reset the SMC before installing the newer battery or should I wait till I fully ...
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2answers
540 views

SMC reset to fix battery not working, but cant be sure SMC reset has taken place

I have had a new battery in my mid 2012 15" macbook pro running 10.11.6 The battery health as monitored through a battery health app downloaded from the mac app store has been deteriorating ever ...
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1answer
72 views

My SMC keeps corrupting even after I reset it

My SMC on my 2012 mbp keeps corrupting even after I reset it. It won't wake up, forcing me to open it up, unplug and plug in the battery every once-in-a-while, which is becoming a problem because I ...
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0answers
123 views

Something is corrupting my SMC, why or what changes the SMC settings?

I asked a question that led up to this: Raise/lower brightness is extremely slow It works just fine after SMC Reset. But the next day same problem. It appears that the problem is that something is ...
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1answer
202 views

MacBook Air 13 (mid 2012) shuts down at 50% battery without warning, SMC chip broken? [duplicate]

Some weeks ago I bought a second hand MacBook Air. The MacBook Air runs fine but always shuts down without any warning at around 40-50% in battery mode. After restarting battery is at 0%. First I ...
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0answers
25 views

Macbook Air doesn't turn on [duplicate]

I have a 2017 Macbook Air 2017. A week ago I turned it on and wrote my password, then it shut down. I tried to turn on but nothing happened. I read some posts on the Internet and tried the following: ...
2
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0answers
268 views

Can't hibernate computer MacOS High Sierra, no pmset “standby” option

I have a Mid-2009 Macbook Pro 17 inch (5,2), with MacOS High Sierra 10.13.6 installed. I want to enable hibernation (or standby, or deep sleep, or safe sleep) in order to power off the RAM when in ...
3
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1answer
508 views

Why “wake for network access” does not work when setting CI server

We need to set up a CI server using mac. We set up our private gitlab server on the cloud and gitlab-runner on a mac at the office. When the mac does not go to sleep it works well. But when it goes ...
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1answer
62 views

Troubleshooting `InternalPreventSleep`

My MBPr has been draining itself frequently overnight if not plugged in. I noticed today when I had the lid open, it would unlock itself with my Apple Watch - no input from me. I looked in Console and ...
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3answers
710 views

Black screen on MacBook Pro login

I'm getting a completely black screen any time I log into my MacBook. I enter login details and hit enter. It was getting about half way through progress bar displayed after this and then screen just ...
1
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1answer
39 views

Preferred Order of NVRAM/PRAM, SMC, and OS resets

Is there a preferred order in which I should reset the NVRAM/PRAM, SMC, and OS on my MBP? If so, what is this order (and why)? Edit: I intend to do all of them to completely reset my computer. No ...
3
votes
2answers
613 views

Mac fan speeds really high

I am using istats to see the speed of my fans: I ran a diagnostic by holding down d during a restart and it came up without any errors. I've also reset pram and the readings are still really high. Is ...
3
votes
1answer
59 views

My MacBook Pro touch bar 13" isn't starting

My MacBook Pro touch bar 13" isn't starting and here's what I'm seeing: 1) No power - I can't hear blowers or any sound or see any activity on the backlight when I press the power button/touch ID 2) ...
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1answer
18 views

What can I do when the power button does not put the macbook to sleep?

I have this randomly recurring problem that a short press on the power button will not cause my Mbp mid-2012 to sleep. Besides that, everything is normal, i.e. I can still use it to power off and I ...
2
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1answer
91 views

Power consumption of iMac

All other things being equal, what is the difference in power consumption of iMac with 8GB of RAM and iMac with 16 GB RAM?
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3answers
141 views

Mac Pro goes to sleep despite settings

My Energy Saver system preferences look like this: The thing is, I don’t want my Mac to ever go sleep — especially last night when I had Handbrake transcoding a ton of important files I was expecting ...
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1answer
345 views

SMC Fan Control Causing random freezing and crashing

After experiencing crashing and freezing on 15" MacBook Pro 2017 (macOS High Sierra), I started eliminating running programs that I thought might be causing the crashing as advised by an apple support ...
2
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0answers
33 views

Let connected device know about the maximum 2.1A output of a USB port via software

I am fairly technical and I was wondering if there are any software based hacks or modifications that I can apply to force the maximum of 2.1A to be supplied through a USB port without the attached ...
4
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2answers
2k views

Removing the sleepimage file in /var/vm in macOS permanently

I run high sierra, and the large private/var/vm/sleepimage file has been bothering me. My computer has 16 GB of ram, which means sleepimage takes up 16 GB on my drive. I have read tutorials on how to ...
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1answer
105 views

pmset -g: UPS Power -1; AC Power -1*

When issuing the command pmset -g in macOS (tested on El Capitan through High Sierra) the first two lines come up about the active UPS and AC profile: Active Profiles: UPS Power -1 AC Power ...
2
votes
1answer
340 views

Understanding Mac Battery Information

In System Information, we can obtain information about the battery, e.g.: Battery Information: Model Information: Serial Number: D866192Q1NFFWLKE1 Manufacturer: SMP Device Name: ...
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1answer
110 views

On iPhone 5s, can the battery itself be the cause of fast draining, even after a brand new U2 chip is installed?

My battery was draining very fast even when UNUSED and in LOW POWER MODE. This was happening even in AIRPLANE mode (i.e. overnight, unused, in Airplane and Low Power Modes both enabled). I got the ...
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1answer
66 views

Force MacBook to drain the battery while connected to charger

I leave my MacBook Pro on my desk nearly all the time, connected to the charger with the lid closed, connected to an external display. I've heard this is bad for the battery health, and everyone in ...
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2answers
479 views

Mac turns off the power supply when it sleeps

I'm send my laptop to sleep ( -> Sleep) and when I open it later, it starts loading system from the beggining as if I powered off it. I lose progress in my work because of this. I don't found where I ...
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2answers
69 views

Macbook A1181 Shuts down after a few minutes [closed]

My dinosaur macbook randomly shuts down. I've reset the SMC and it still shuts down. Even the computer doesnt know its coming because you can hear the arm inside the hard drive clunk as it shuts down. ...
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0answers
42 views

Underclock retina iMac [duplicate]

My iMac is wonderfully performant, but under extended load it sounds like a hive of angry bees. I am using Turbo Boost Switcher to avoid using up all the CPU headroom, but for multithreaded ...
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0answers
689 views

Malfunctioning USB-C to Ethernet hub - SOLVED

My Macbook Pro 15inch with the touchbar stopped recognizing my external USB-C adapter Sinstar 8 in 1 Aluminum Multi Port Adapter . I should clarify perhaps, the HDMI port still works fine, but the ...
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0answers
153 views

Macbook turns off before battery is 0% when left unplugged. (Already reset SMC and PRAM several times) [duplicate]

This is my first question on this forum. My MacBook has been turning off randomly when left unplugged. It shuts down before the battery indicator reaches 0%. I have reset the SMC and PRAM several ...
3
votes
1answer
1k views

Power button not working on Macbook PRO 13" 2013 - ideas on how to reset SMC

We have a 2013 13" MacBook Pro that is behaving strangely on the keyboard. As far as we are aware there has been no water damage to this MacBook. Symptom: Power Button on keyboard shutdowns but won'...
2
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1answer
323 views

MacBook Pro tries to shutdown every X hours

My Macbook Pro is trying to shutdown itself every X amount of hours, is there a way to check in the logs what process is triggering the shutdown process? I can see the following in the logs, but not ...
2
votes
2answers
137 views

Cannot alter MBP Power Management Settings

I've got this problem where I can't alter some pmset values in Terminal. I can change them, the changes are registered with pmset -g, but they are ignored. Example: pmset acwake 0 but Mac still ...
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0answers
853 views

High Sierra: What Happens When Closing the Lid

I'm using the latest MacBook Pro 15" with Touch Bar and an up-to-date High Sierra. I would like to know, please, what actually happens in the when the below scenarios occur, and I guess it varies ...
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0answers
86 views

Can I force my MacBook to only charge from the USB-C device I select? Or forbid it from charging from devices I know to be unreliable?

For some reason, my MacBook keeps trying to charge off of my external display's USB Type-C ("USB-C") link even though I have a more powerful source connected. I care because the monitor is ...
0
votes
1answer
50 views

Why does my external USB drive power off even when set not to?

My understanding of standby modes in MacOS is they will not be triggered with an external disk. However even though I explicitly set my power settings not to sleep the disk, it still does. $ pmset -g ...
3
votes
0answers
764 views

Disable wireless power save

Is there a way I can disable the power saving functionality of the wireless in OS-X Sierra (10.12.6)? The issue I'm trying to address is where the wireless goes to sleep and wakes up every few ...
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0answers
101 views

Are HibernateMode and Standby defunct on modern Macs?

In my ongoing research about pmset it seems autopoweroff replaces standby and hibernate functionality; they might still be supported but modern OS versions disable them. In particular, hibernatemode ...
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1answer
18 views

Is my external USB drive causing erratic sleep/hibernate behaviour?

I've been reading up around sleep settings as I keep finding my Late 2012 Mac Mini in a weird hung state each morning that requires a force-reboot (it's like running Windows 10 years ago!) I thought ...
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0answers
29 views

Disabling the confirmation dialog when turning off power saving

In Settings > Energy Saver, if I select "Prevent computer from sleeping automatically when the display is off", a warning / confirmation box pops up which has to be dismissed before the setting is ...
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0answers
81 views

With lid closed, Macbook still occasionally wakes from sleep

I've written some logging software in Electron which runs on macOS. I handle the suspend and resume events to stop and start recording automatically when the device is closed/suspended. I've noticed ...
2
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0answers
982 views

What is the best way to deal with coil whine on a Mac laptop?

I have owned my MacBook Pro for a little over a year, and it has been serving me really well. Ever since I first opened it, the device was experiencing the Retina "staining" issue, so Apple recently ...