Questions tagged [power-management]

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

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2
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1answer
28 views

Besides the main battery, do any components inside MacBooks rely on any other batteries to operate?

Besides the main battery used to power Apple notebooks, do current MacBooks have any other built-in non-rechargeable batteries that may need to be replaced after a certain period of time? I was ...
1
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2answers
260 views

What does this statement about saving battery power on iOS mean?

While reading the iOS 14 guide by Apple here, on page 78, In the Quit and reopen an app section What does the highlighted statement mean? Is it that on iOS, the apps don’t close(terminate processes ...
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1answer
17 views

iPod is not Charging

When I connect my iPod shuffle to my computer it is not pulling up the profile that I can put music on normally it will pull up but it not pulling it up for me, and it won't charge it. Another thing ...
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1answer
14 views

MacBook shuts down at login screen

I have an early 2015 MacBook Pro. I’ve had the service battery warning for over a year now. The battery lasts like 5min nowadays but I’ve been using it like desktop so it’s always plugged in. I just ...
4
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1answer
951 views

Macbook Pro 2018 battery not charging dodocool 7-in-1 hub suspected

I am having a version of the battery not charging issue on my Macbook Pro 2018 (13-inch, Four Thunderbolt 3 Ports). The symptoms are somewhat different from related issues, such as in this post. I am ...
3
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1answer
2k 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
30 views

Is it possible for a Macbook Pro to pop out a window and / or give some sound a few minutes before sleeping?

Is there a way to pop out a window and / or to give out some sound a few minutes before it goes to sleep? There is one warning, but I hope to get another warning a few or a couple of few minutes ...
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0answers
40 views

DVI (via Thunderbolt) display doesn't sleep reliably

My new Mac Mini (late 2018) has 3 monitors connected - one via HDMI and two Thunderbolt-to-DVI. The two DVI monitors are both HP 2011x, and I had them previously connected to a now-retired Mac Pro, ...
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0answers
350 views

Macbook sudden black screen & Shutdown

My MacBook pro retina 15" Late 2013 8 gb RAM MacBookPro11,2 A1398 (EMC 2674 ) was shutting down by itself, and when I ran the command in terminal the log it says, kernel: (AppleSMC) Previous ...
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0answers
14 views

Keep external monitor connected when computer is locked

On my 2016 MBP with an external monitor connected through DisplayPort, when I lock my computer, the monitor is immediately "disconnected", so when I unlock my computer, it takes up to 15 ...
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1answer
45 views

Can “Discrete only” GPU cause slowness?

I have 2 external monitors to my 2017 Macbook Pro v.10.15.6. Sometimes it slows -- the mouse lags badly. I installed gfxCardStatus and sometimes the menu choice changes from Dynamic switching to ...
1
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2answers
106 views

MacBook Pro shows not charging when plugged in

I've got a MacBook Pro (Retina, 15-inch, Mid 2015) and as of today it says "not charging" even when it's plugged in. The MagSafe connector has an orange light, and the power menu's screenshot is ...
3
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1answer
32 views

Is there a way to have my macbook set its brightness based on it running from battery or from line power?

Basically I'd like to have one brightness setting configured for when I'm plugged in through the adapter and charging the macbook from wall power, vs a lower brightness setting when I'm running off ...
1
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1answer
136 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 ...
1
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1answer
39 views

How to find watt hours of MacBook?

I see the latests Macbook Pro 16" has a 100 watthour battery - how do I find the equivalent stat for my current Macbook given the info under About -> System Report -> Hardware -> Battery ...
0
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1answer
57 views

Why does Automatic Graphics Switching keep re-enabling itself without my involvement?

I disable Automatic graphics switching under Energy Saver, as it significantly slows my Macbook Pro (10.15.5). Yet this checkbox keeps getting re-enabled when I have not touched it! How can I prevent ...
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1answer
34 views

Mac book air is not turning on and getting cricket noise when press power button

My Mac book is not turning on when pressing power button . I can hear a cricket sound when ever I press power button. Initially it was turning on when I do SMC reset . But now power is full and ...
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0answers
16 views

MacBook Pro battery not charging error - long term fix [duplicate]

I have a 2018 MacBook Pro 13 inch (the one without the touchbar). Over the past weeks, I have twice faced the situation where the charger is plugged in but the battery is draning and I get a "...
1
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1answer
38 views

My Mac crashes and shuts down when charger is unplugged, not immediately

Hey so my Macbook Pro (Retina 15" 2014 i7 2.6GHz, High Sierra (institute doesn't allow me to update)) is turning itself off randomly, and as far as I've figured out this will only occur when the power ...
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0answers
19 views

Odd OS X behavior when it goes to sleep - returned to Login, said it shut down bc of a problem

I have posted something like this before, I run a 2012 MBP with Catalina. The odd behavior is that if I close the lid the machine seems to shut down completely (even with the power connected) and ...
1
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1answer
3k views

How to downgrade SMC firmware

I have a MBP 6.2. Some time ago (1,5 year I guess) I have installed latest Mountain Lion upgrade and my WiFi (airport) stopped working. Tried many options, spent lot of time on different forums, did ...
6
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2answers
3k views

Ignore “prevent sleep” request from a specific app

I sometimes have the problem that my macbook won't sleep, even with the lid closed. After some investigation I tracked the problem down to Spotify app; when the app is open, even if no song is playing,...
1
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1answer
34 views

MacBook Air SMC Update v1.8

MacBook Air SMC Update v1.8 This update addresses a rare issue on some Apple notebooks where a battery that has accumulated more than 1000 charge cycles may unexpectedly shut down or stop functioning. ...
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2answers
579 views

“Battery Health” in macOS Catalina 10.15.5?

I have just installed the macOS Catalina 10.15.5 update on my 11" Mid 2013 MacBook Air. The update is working fine. The MacBook Air specifications on the Wikipedia page says that this model has a ...
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0answers
582 views

Apple Diagnostic Result PFM006 and Kernel_Task taking upto 300 % of CPU and Depleted Battery

My Macbook Air (2018) Retina battery has depleted within 130 cycles. I was running Windows via Bootcamp in heavy load, letting it discharge fully and charge repeatedly. If I unplug from power source ...
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0answers
24 views

Does booting into windows causes start-up issues such as hibernation?

I am using MacBook Air 2019 running OS X Catalina. For the past few weeks, I have been facing the issue with regard to my mac going to hibernate. This hasn't been the issue since I bought the mac this ...
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0answers
22 views

MacOs PreventUserIdleDisplaySleep is 1 without any assertion and the computer is not turning off the display

I have noticed that the Apple Display of my docked MBP was on. After a little digging, I found that the assertion for display was on but there was no process claiming it. How can this be possible? $ ...
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0answers
23 views

MacBook Pro 15-inches display not working: how to isolate the cause of the issue?

On last Saturday I left my MacBook Pro (15-inches display, mid-2012 release) on during the night in order to finish some backup tasks and I scheduled its shutdown for a certain time using shutdown -h. ...
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1answer
404 views

Reset SMC without keyboard

My MBP (13-inch, 2017, Four Thunderbolt 3 Ports) has been hit by a small object on its keyboard. I was thinking it didn't get any damage, but several keys are not working anymore and the keyboard ...
0
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1answer
32 views

Macbook Pro 5,1 will only boot after multiple SMC resets

I have a Macbook Pro 5,1 (late 2008) running El Capitan (10.11), which is the latest officially supported OS for that machine. When I turn it off I cannot turn it back on without resetting the SMC ...
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0answers
29 views

MBP retina 2015 won’t power on after SMC reset

I was using my computer while it was plugged in and the light on the Magsafe charging cable was green. I noticed at the top that the battery indicator was at 78% and was not indicating it was charging....
3
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2answers
3k views

How to detect if Mac if rebooting after a power failure using terminal?

As I asked in the title, how can I check if a Mac is rebooting after experiencing a power failure. It would be preferable to check this using terminal or some other script, as I would like to test ...
0
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1answer
96 views

Black Screen on 13" Macbook Pro 2019/Catalina. Resetting NVRAM/PRAM, SMC does not work

My wife's Macbook Pro suddenly dropped to a black screen with the power still on; keys light up, caps lock light comes on; display is clearly getting power. Holding down the power button kills power ...
8
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6answers
12k views

Why does my laptop shut down overnight?

Whenever I leave my MacBook Pro (Retina, 13-inch, Early 2015) unattended (plugged in, or not) overnight (or for long periods of time) it shuts down by itself. When I open the lid it boots up to the ...
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0answers
49 views

How to stop CorruptPowerlog eating up my disk space?

I am running 10.14.6 (18G3020) on a 2018 MacBook Air. Every 15 seconds or so a triplet of files is created in /private/var/db/powerlog/Library/BatteryLife/Quarantine. For example 30144 -rw-r--r-- 1 ...
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0answers
8 views

MacBook Pro 13-inch, Late 2013, shuts down as soon as it gets to lock screen

I've been using my macbook for a long time without disconnecting the charger and usually put on the sleep mode instead of shutting it down. One day randomly it shut down out of nowhere and wouldn't ...
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0answers
29 views

Weird anomaly on my MacBook Pro

Recently I've encountered a problem, and quite frankly, of course it had to be one of those cases where nothing absolutely helps. It started around a couple weeks ago, the system was getting random ...
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0answers
21 views

iMac 21.1 -2012 ( Model 13,1 )

I have problems with my iMac 21.5" -2012 (13.1 model). The machine is not starting like normal. The fan turns on max from the begining, lasts over 6 minutes and then the system is very slow. I ...
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0answers
13 views

iBook G4 PPC goes into random standby

I have set up an iBook G4 PPC to never go into standby. I have also configured scheduled power off and on. However, it randomly gets into standby from time to time. Since I am using it remotely, it's ...
3
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1answer
132 views

Difference between charging icons - does it mean anything?

Sometimes I see this: instead of this: is there a difference? do they mean different things? One is filled in dark, the other is more transparent - the battery/charge icon..
3
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3answers
2k 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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0answers
24 views

How can I check for Power Nap event history?

I'd like to see when my Mac is waking up with Power Nap. How can I check the event history to see when Power Nap is causing my Mac to wake up? Especially interested in wake-up events while on battery ...
4
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2answers
27k views

MacBook Pro won't power on after SMC reset

Some water was spilled on the table and came in contact with my wife's Mid 2009 MacBook Pro near the MagSafe adapter causing the MBP to shut itself off. Based on some recommendations from the internet,...
0
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1answer
2k views

Safari using significant energy

I am currently using a 2017 Mac Pro touch bar that is still on Mojave 10.14.6. My safari is consistently shown using significant energy on my menu. In my activity monitor, I noticed there are many ...
2
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2answers
2k 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 ...
4
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2answers
4k views

MacBook Pro randomly waking up from sleep after Catalina update

Since the upgrade to macOS Catalina 10.15.0, I've noticed that my MacBook Pro is randomly waking up from sleep. I use the MBP connected to an External display, BT mouse (MX Master), an external ...
4
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4answers
1k views

“this computer has been scheduled to go to sleep” when none is set

Simple question- My mac regularly & seemingly randomly tells me it has been scheduled to go to sleep automatically- usually (I think) right after I wake it up. I have no schedule for automatic ...
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1answer
2k views

Can I completely turn off the fans on a MacBook Pro (0 RPM)

I would like to know if there is a utility to completely turn off the fans. Currently, when completely idle, fans are showing 2000 and 2100 RPM. Although this is probably not recommended, I would ...
4
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3answers
2k 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 ...
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0answers
79 views

Macbook Air 2017 - does not turn on, battery charging and seems to work

I have a 2017 Macbook air that is giving me problems since last month. The laptop when it goes to sleep while not charging won't come back to life. At first, the SMC reset worked but now that doesn't ...

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