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Questions tagged [power-management]

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

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Prevent screen dimming on Low Power Mode on macOS

When Low Power Mode is enabled on macOS, the screen seems to dim (even if the "Slightly dim the display on battery" option is disabled in Battery settings). However, when low power mode is ...
Oion Akif's user avatar
  • 9,042
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0 answers
21 views

Power failure or bug?

It looks like my power adapter or cable or something else (?) is failing.  But it's a bit weird.  When I plug in my 2019 Macbook Pro, several times I hear the "just plugged in" sound.  What'...
WGroleau's user avatar
  • 5,065
1 vote
0 answers
30 views

USB-C Sound Interface disconnects when Macbook Pro M3 sleeps and does not recover

When my 16" Macbook Pro M3 (November, 2023) goes to sleep, my Focusrite Scarlett 2i4 sound interface disconnects and I have to re-plug the USB-C cable back to get it working again. It is plugged ...
Petrus Theron's user avatar
1 vote
1 answer
68 views

MacBook Pro 2011 is not charging

I have a MacBook Pro late 2011. It all started when my dog chewed through the magsafe charging cord. Then I wrapped the affected area with duct tape. The next day, I connected my macbook to the same ...
Sergey's user avatar
  • 11
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0 answers
14 views

pmset: Error 0xe00002db cancelling all scheduled events [duplicate]

I get the following behavior on my mac. > sudo pmset schedule cancelall pmset: Error 0xe00002db cancelling all scheduled events > sudo pmset schedule cancel wake '04/13/2024 09:27:02' pmset: ...
gregory_house's user avatar
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0 answers
36 views

How can I prevent macOS from rearranging windows?

macOS appears to rearrange windows, sometimes. I haven't figured out the exact circumstances, but it always seems to occur while the system is idle, usually long enough for the external monitor to ...
Thanatos's user avatar
  • 132
1 vote
1 answer
217 views

How do I reset: sudo pmset -a disablesleep 1

I was messing around with pmset and I added this setting: sudo pmset -a disablesleep 1 in my terminal. I have got Amphetamine for my Mac, so I want to take off this pmset setting. How could I?
rehaan13's user avatar
0 votes
1 answer
46 views

Shutdown error that cannot be pinned down

Here is the issue in a nutshell: My machine has taken to giving me an error dialog that begins with the following on every restart or shutdown and restart, manual or otherwise: You shut down your ...
nihilon's user avatar
  • 135
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0 answers
55 views

Can't find some kernel logs that could be seen in previous macOS versions

I am looking for the kernel log messages that are output during the macOS hibernation process. As an example: 8/20/14 11:58:40 AM kernel wired_pages_encrypted 60968, wired_pages_clear 39229, ...
Desert Scuba's user avatar
1 vote
0 answers
61 views

Mac Virtual Machine can't sleep

I have been running a macOS Ventura virtual machine using both UTM and Parallels on a Ventura host and have been trying to put the VM to sleep so I can monitor what happens with the logs. However, it ...
Desert Scuba's user avatar
0 votes
1 answer
791 views

Where is that "Put the hard disk(s) to sleep when possible" checkbox in modern macOS Sonoma etc. edition of the System Settings?

I would like to turn off the "Put the hard disk(s) to sleep when possible" feature is System Settings. Some folk say that will solve the mysterious problem of Disk not ejected properly error ...
Basil Bourque's user avatar
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122 views

Delays to Sleep and Wake notifications

Is it normal that there are Kernel Client Acks every so often while my Mac is asleep indicating that there are delays on several drivers? I found entries like this via the command: pmset -g log | grep ...
Blurfquarf's user avatar
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0 answers
55 views

macOS: Programmatically access the "Screen On Usage" data shown in Settings->Battery

How do I programmatically access the "Screen On Usage" data shown in Settings->Battery?
HappyFace's user avatar
  • 652
2 votes
1 answer
58 views

Connect 2 power providing USB-C devices to MacBook Air M2

I have a "BenQ PD3420-Q9H" monitor, which is connected via USB-C to my MacBook Air M2 and delivers power to charge it. The monitor has a built-in hub, which is easy to use but not sufficient....
BarStel's user avatar
  • 23
0 votes
1 answer
28 views

Auto switch sound sink on power change

I like to switch various working positions at home. I want to make it change to the bluetooth speakers on power plugged in. And switch to internal speakers when unplugged. How to do it with some App ...
xgdgsc's user avatar
  • 751
1 vote
0 answers
56 views

Schedule on and skip login screen

I'm trying to schedule my Mac Mini to automatically turn off at the end of the day and then turn back on the next morning, login, and then run an AppleScript. This was all working fine in Monterey ...
Luke's user avatar
  • 111
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0 answers
144 views

Errors from PerfPowerTelemetry/PerfPowerServices

I see these recurring errors from PerfPowerTelemetry No metadata for metric: InstantAmperage No metadata for metric: AppleRawCurrentCapacity No metadata for metric: CycleCount No metadata for ...
marathon's user avatar
  • 707
3 votes
1 answer
301 views

How to stop all processes that prevent sleep via Terminal?

In the Activity Manager, you can see which processes prevent the system from sleeping. I know that the WindowsServer is a false positive, but others are not. Sometimes I attempt to put my MacBook to ...
Martin Braun's user avatar
1 vote
2 answers
196 views

kernel_task shutting down network when CPU not overheating

[MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports), 2.3 GHz Quad-Core Intel Core i7, 16 GB RAM, running Monterey 12.6.4] kernel_task consumes inordinate CPU periodically--around 100+% according to ...
Name Withheld's user avatar
1 vote
2 answers
426 views

Battery not charging on MacBook Pro (mid-2012)

Seems to be a common problem, but so far, I haven't found a solution. I have a mid-2012 MacBook Pro 15" running OSMojave 10.14.6. The battery I'm currently using has seen days, but all sysinfo ...
Obert Seb Luger's user avatar
0 votes
0 answers
247 views

Optimizing Mac mini power consumption with 24/7 uptime

We have a new outdoor cat, and my wife put an AirTag on her. I set up a bash script on my Mac Studio to read the Find My json every minute and append new info into a csv. So long as the Find My app is ...
user217906's user avatar
0 votes
0 answers
43 views

Dock utility that shows current energy usage

The Activity Monitor.app has its own section all for energy consumption. This is really great for finding the aggregate worst offenders. The cpu section is great for finding the worst offender at any ...
oligofren's user avatar
  • 372
2 votes
1 answer
1k views

How can I fix a MacBook that won't start due to a faulty battery? Can I run it without one? [duplicate]

I have a MacBook pro 2016. Over the past few months, the battery performance started deteriorating rapidly. It wouldn't change all the way up to 100% anymore, and over time the maximum charge level ...
Isaac King's user avatar
1 vote
0 answers
25 views

Computer sleeping immediately after screen despite being set to sleep later

My current pmset -g is the following: System-wide power settings: Currently in use: lidwake 1 autopoweroff 1 standbydelayhigh 86400 autopoweroffdelay 259200 ...
mariano-daniel's user avatar
0 votes
0 answers
139 views

Sudden change: closing lid turns off external monitors

I have a MacBook Pro M1 with two external monitors, one on the HDMI and one on a Thunderbolt port. This setup has worked well for quite a long time now. Prior to this morning, I would plug in the ...
ccleve's user avatar
  • 301
7 votes
2 answers
3k views

Can a MacBook safely handle chargers that fluctuate maximum power?

I have a MacBook Pro M1 16”. Can it safely charge when the charger (with multiple USB-C ports) will fluctuate between 45 watts and 100 watts, based on number of cables plugged into it? Can the ...
Danny's user avatar
  • 181
1 vote
1 answer
937 views

How to Reset the PMU on a PowerBook G4 15" A1095 5, 4 laptop?

I have been refurbishing 3 PowerBook G4 15" A1095s and 1 PowerBook G4 15" A1106 and need help with battery issues. All of them have been able to charge a battery. I have attempted to and ...
Novice's user avatar
  • 11
0 votes
1 answer
56 views

Big Sur - Detecting when the screen has turned off

Is there a way under MacOS Big Sur (11.7.3) to detect when power-saver mode has kicked in and the screen has turned off? I want to have a special utility run every time the screen turns off. Is this ...
HippoMan's user avatar
  • 390
0 votes
0 answers
138 views

how do I make macOS never make a MacBook inactive?

I would like to make sure that my macOS MacBook is always running, even when the MacBook cover is closed (though connected to the power). There is a program running on the MacBook that needs to be ...
kloop's user avatar
  • 223
1 vote
2 answers
458 views

Cannot disable sleep on lid closing

New Mac user here. Got hold of two 2012 MacBook Pro notebooks. One of them has no battery and the other one has a slightly degraded battery. So here we're talking about the latter. On this one with ...
Skegg's user avatar
  • 181
3 votes
1 answer
2k views

MacBook Air M1 battery completely drained after not using it for a few months

I powered off my M1 MacBook Air a few (~3) months ago and I was surprised to find out that it had drained completely when I tried to power it on today. Why did this happen? If I recall correctly the ...
John's user avatar
  • 33
1 vote
1 answer
100 views

How can I monitor the energy impact of peripheral devices connected to my Macbook?

How can I monitor the energy impact of peripheral devices connected to my Macbook? I want to see if my external HDD is draining my battery or not.
HappyFace's user avatar
  • 652
1 vote
2 answers
1k views

How can I set the low power mode to "Only On Battery" programmatically?

How can I set the low power mode to "Only On Battery" programmatically? Using sudo pmset -a lowpowermode 0 sets it to "Always."
HappyFace's user avatar
  • 652
0 votes
0 answers
71 views

Macbook M1 connected to display randomly shuts down while sleeping

A Macbook M1 connected to external display randomly shuts down while sleeping. The problem occurs regardless of the type of display connection (HDMI or USB-C). What can be the cause of this problem? I ...
Tarek's user avatar
  • 141
4 votes
1 answer
2k views

What happened to "Restore Defaults" for Power settings in Ventura?

I just upgraded to Ventura and trying to get used to some of the changes. I see that the Energy Saver settings are no longer under the Battery section of System Settings and instead are now part of ...
user19103974's user avatar
1 vote
1 answer
639 views

How do I prevent MacOS 11.2.3 (20D91) from logging out after some minutes inactivity?

I am running a task on an old iMac. MacOS version is 11.2.3 (20D91). The task is about downloading 8000+ photos from an old iPhone with Image Capture. The task goes on very smoothly if the macOS doesn'...
AGamePlayer's user avatar
  • 1,897
2 votes
1 answer
484 views

Is it programmable to make macOS ignore the power adapter and use only the battery? [duplicate]

There is a similar question here, but what I want is make macOS ignore the power adapter totally not just stop charging (which means the operations on mac will drain the battery). Aldente has a ...
Alaneuler's user avatar
0 votes
0 answers
239 views

Standby versus autopoweroff

From the pmset manpage: STANDBY ARGUMENTS standby causes kernel power management to automatically hibernate a machine after it has slept for a specified time period. This saves power while asleep. ...
user1785730's user avatar
1 vote
1 answer
2k views

What is the best way to protect battery of an always-powered iPad?

If an iPad is always powered, the best way to protect the battery is not to use it at all, i.e. the system charge the battery to 60% then only use the external power supply and only use the internal ...
iUnknown's user avatar
  • 249
2 votes
4 answers
437 views

Mac book air 2020 quad core: TERRIBLE performances, battery 1% no charge, fan very fast and loud, no warm

In our storage we have 6 MacBook Air 2020 with intel quad core CPU with Catalina. ALL of them have the same issue: No typical sound as the MacBook power up Battery remain at 1% no charging (...
Indio's user avatar
  • 121
4 votes
1 answer
152 views

MacBook Pro won't start up on Mondays

EDIT: Solved it... resetting the NVRAM did the trick. I have a 2018 MacBook Pro running macOS Catalina. It's set in the energy settings to shut down in the evenings, and boot/wake on weekday mornings....
JVC's user avatar
  • 2,871
1 vote
1 answer
2k views

Macbook Pro M1 shows cross in battery icon

Since yesterday, my mac is showing a cross in battery icon in menu bar. I'm unable to boot it up after shutting down without plugging in the charger. On removing charger, battery in system ...
Mohit Singh's user avatar
0 votes
0 answers
18 views

Will iPhone modem and cellular radio turn off if WiFi connected

Imagine an iPhone on a high speed train: the radio will burn extra power to find good signal, while transiting through poor service areas. If I connect the iPhone to the train’s WiFi, does the iPhone ...
gatorback's user avatar
  • 3,081
0 votes
1 answer
447 views

macOS Monterey: set power button default long-press action, possible? [duplicate]

When long-pressing the power button, instead of showing the thing below, can I specify it to sleep immediately? I have searched the web, but the only thing I could find was this question for Lion, and ...
Damn Vegetables's user avatar
1 vote
0 answers
493 views

macOS Monterey: Enable idle screen off, but disable idle sleep, when on battery

On Windows, the idle screen turn off timer and idle sleep timer are two independent settings. On macOS Monteray, it seems there are no separate settings, but just one, and on battery, it seems the ...
Damn Vegetables's user avatar
10 votes
3 answers
3k views

How to make MacBook battery last as long as possible while watching videos?

I want to do nothing on my MacBook except watch pre-downloaded MP4 videos. How can I make the battery last as long as possible in this situation? I will of course already: screen minimum brightness ...
minseong's user avatar
  • 9,064
0 votes
1 answer
50 views

Excess power use alert?

I often hear the fan on my redacted's MacBook Air running continuously, indicating high power usage. Unfortunately, they're hard of hearing, and only likely to hear that when wearing hearing aids. Is ...
dfeuer's user avatar
  • 101
1 vote
0 answers
828 views

MBP Pro M1 with macOS Monterey 12.5 waking itself from sleep (hourly)

I notice the MBP keeps waking itself from sleep during the night (hourly), even though I turned off power nap, TCPalive, etc. Has anyone figured out why? I like my devices to actually sleep when I put ...
Jean Monet's user avatar
2 votes
1 answer
2k views

What's the unit of "12 hr power" in the energy section of activity monitor?

In the "energy" section of activity monitor, there is a heading "12 hr power". Is there a the unit of this quantity so that I can convert it to watts?
Ma Joad's user avatar
  • 411
4 votes
2 answers
7k views

How do you interpret "12 hrs power" in Activity Monitor?

When hovering over the 12 hrs power column header in the Energy tab of Activity Monitor, it says: Average Energy Impact over the last 12 hours or since the Mac started. Lower is better. In my case, ...
stevec's user avatar
  • 5,105

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