Questions tagged [power-management]

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

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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?
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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, ...
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How to get specific value of power management parameters (pmset)

I am following few topics on adjusting sleep setting using pmset to fight battery drain on modern mac (https://apple.stackexchange.com/a/423635/136107, With Power Nap off, what causes MacBook Pro ...
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M1 Mac Mini monitor has gone to sleep and I can't wake it up

M1 Mac mini (M1, 2020), with 2 Lenovo L22e-20 monitors. I left the Mac unattended for 10 minutes, when I came back, 1 monitor is still on but the other has gone to sleep. The one that stays on is ...
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  • 217
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Control strip stop works after about 24h of working + sleep, required SMC reset

Control strip stop works after about 24h of working + sleep, required SMC reset Problem appears then i dropped about 0.06 L Coca Cola on Upper-Left side of my MacBook Pro (16-inch, 2019). First 2-3 ...
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HDMI display will sometimes not wake on but SSH works

Ever since upgrading my Macmini8,1 to OS v12 or 12.3, the display will sometimes not wake the next morning when I try to use it. When in this state, nothing I try gets me a working display and I am ...
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26 views

Why won't iPhone charge?

I have an iPhone 13 Pro, it is running iOS 15.4. It will only charge when it's dead, and even then it charges really slowly. It only will charge to 1% and then stops charging. I have tried restarting ...
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4 votes
3 answers
592 views

How to disable fast charging on 2021 Macbook Pros?

Is there a way to disable fast charging on 2021 Macbook Pros? These are my reasons for doing so: lower speed charging produces less heat and is therefore less stressful for batteries I would always ...
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Why would my wife's MacBook Pro start up as soon as I touch the keyboard?

My son just spilled milk on the keyboard of my wife's MacBook Pro. This is definitely a time to cry, because of the risk of liquid getting into the electronics of the computer. I immediately held ...
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1 vote
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53 views

Why is Home using so much battery life?

I don’t use Home to control my lights. I use the Hue app. Why is it using so much power in the background? I’m on iOS 15.1.1 on an iPhone 12 mini.
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Why is my (genuine Apple) 10W/2.1A iPad AC charger providing only 5W when powering my new M1 MacBook? [closed]

I'm curious, and M1/ARM64/Apple Silicon MacBooks are incredibly efficient, so I am exploring using smaller power sources like my (genuine Apple) 10W/2.1A iPad AC charger. But I wonder: Why is it ...
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163 views

Can a display's Power Delivery be turned off?

my main machine is a 2016 15" MacBook Pro and, working in print graphics, I usually have it connected to an external display (as of today, a Huawei MateView 28.2in). This display has 65W power ...
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99 views

high fan speed even w/o SSD on MacBookPro9,2 (mid-2012) MD101LL/A

It is important that I give a detailed description of the event MacBook model MacBookPro9,2 (mid-2012), MD101LL/A, Core i5, 16G RAM, SSD 500GB, bought in 2014 Used up to a week before the disaster, ...
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0 votes
1 answer
181 views

MacBook Air won't power on, unless battery disconnected and plugged in

This is for those who have had trouble with all the combined issues: Macbook Air 2012-2017 ( possibly other models) Won't turn on unless the battery is disconnected for a short time and then plugged ...
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1 vote
1 answer
333 views

Mac fan always running, even after SMC reset

Ive got a 2017 15" MBP with an i7 CPU running Big Sur. The mac's fan has been running very loud for a few weeks now, i googled it and did an SMC reset, but this has not solved the issue. The fan ...
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2 votes
1 answer
464 views

Reset SMC without Option and Control key

I need to reset SMC on my Macbook Pro 15 2018 to try fix power problems (macbook goes to sleep even though its disabled with sudo pmset -b disablesleep 1). The problem is, I spilled some water on my ...
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1 vote
2 answers
200 views

Is it a battery problem or SMC problem?

I have a mid-2015 MacBook Pro running High Sierra. Except when I'm traveling, I always use it in clamshell mode and connected to power. I rarely put it to sleep (I have Energy Saver set to just put ...
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2 answers
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Macbook "press and hold power button for 10 seconds"?

In the official Apple support guide to reset the SMC of a Mac with the T2 chip, it says: Before resetting the SMC, try these steps: Shut down your Mac. Press and hold the power button for 10 seconds,...
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2 votes
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Big Sur (Intel) is waking from hibernate automatically, why and how to stop?

Quick Summary pmset -g log | grep -i "wake from" gives the following for "Wake from Hibernate" (full result list bottom): A) Wake from Hibernate [CDNVA] : due to EC.PowerButton/...
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1 vote
1 answer
604 views

Why Notes app use a lot of resource/energy?

I use macOS Big Sur on my MacBook Pro early 2015. Usually, I very rarely open the Notes app, I just using it for copy-paste only, maybe 4-10 times or 2-5 minutes in every 12 hours, but usually I ...
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7 votes
1 answer
1k views

Sleep prevented by powerd

Recently, my M1 MBA was draining out of battery very quickly. I lose 50% charge in an hour, losing about 1% in less than a minute. This was surely not the case before. When I click on the battery bar ...
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0 votes
1 answer
384 views

Macbook Pro 2018 - Battery drain since update while shut down

My Macbook Pro is starting to have power management issues. I tried alrady NVRAM / PRAM Reset and SMC Reset to no avail. I regularly shut down my Macbook over the night. Since a few weeks, the battery ...
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0 votes
0 answers
26 views

How to slow down iMac CPU for quiet operation [duplicate]

With the help of Turbo Boost Switcher Pro, I could always keep my iMac 2020 with its 8-core i7 fanless for 99% of the time without any noticeable slowdown on daily work. Until now. However, now it ...
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2 votes
1 answer
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Macbook Pro doesn't switch on unless I take off its battery (mid 2010)

I changed the battery of my Macbook Pro mid 2010 and it worked all fine for some time. Then I stopped using the computer for a while (around 1 year or a year and a half) and now the computer won't ...
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123 views

Why display of this PDF in Safari disappears after scrolling down? Possible relationship to energy usage?

This comment links to https://arxiv.org/abs/2005.13162 https://arxiv.org/abs/2002.12539 I right-click both in Safari, opening new private viewing tabs then click PDF on each page. The first one (1.) ...
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6 votes
1 answer
2k views

How to execute terminal command on energy efficient cores on M1 chip?

I want to run nodejs process on E cores, but when I run it I see that it uses P cores even if there is a 0.3 second task.
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1 vote
0 answers
64 views

SMC is in U mode, not in A mode

On a Late 2008 MacBook Pro with a dead battery, i have a SMC issue that popped out. My fans are at 100%, no keyboard backlit, the usual SMC story. I've tried the usual technique from the Internet to ...
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1 answer
91 views

Power Manager not working (Connection Disrupted: Unable to connect to this Mac's Scheduler at: Service unavailable via Bonjour (dns-sd))

I had recently installed the most recent version of Power Manager, but after installing the launchdaemon/agent jobs opening the application gives me the error message "Connection Disrupted: ...
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22 votes
7 answers
6k views

Is there a way to prevent my Mac from sleeping during a file copy?

I'm copying a lot of files (over 700 GB) and it takes hours to complete. Is there a way to keep the Mac from sleeping before the copy process completes? I don't want to sit by the computer and moving ...
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-2 votes
1 answer
52 views

Disable Fans on MacBook Air 2019

Hi I'd like to disable the fans on my 2019 MacBook Air. Since it doesn't even do smth for Pooling since ist completly passive coolen (https://www.youtube.com/watch?v=iiCBYAP_Sgg, Video from Louis ...
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1 answer
255 views

Prevent application to post PreventUserIdleSystemSleep

Listing processes which keep my MBP awake with pmset -g assertions shows some applications which I positively do not wish to be able to influence power management. pid 150(coreaudiod): [...
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0 votes
3 answers
700 views

2 Months old MacBook Pro (Mid 2020) battery only last for 4 hours

I'm new to the world of Apple, I bought a new Macbook Pro, mid-2020, Intel i7, 16GB RAM. I'm a developer, I run apps like VS Code, Sublime Text, Slack, Chrome (Multiple Windows), I play videos/songs ...
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1 vote
0 answers
34 views

MacBook Pro requires SMC reset after every boot when on battery

Booting my mid2015 15" MacBook Pro (with FileVault2) from battery works as expected – only that it will hibernate immediately after the user has been logged in. Then I have to perform a SMC reset ...
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0 votes
0 answers
135 views

Why I need to reset frequently SMC controller in my MacBook Pro with touch bar (Intel, T1 Chip)

I have a MacBook Pro with Touch Bar and an Intel processor. I need to reset the SMC controller every time I open the MacBook Pro. It does not start automatically unless I do this. I've tried many ...
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0 votes
1 answer
114 views

How could my Mac be turning the screen off when it's set to "never"?

I have a late 2021 unibody Mac Mini, upgraded to Catalina. For some time I have had problems where the monitor will not wake up from sleep even though the Mac is running - I think it's a known bug in ...
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3 votes
2 answers
230 views

How to get SMC version for 2018 Mac mini

I bumped into a problem, when my USB and USB-C ports stopped working (all except 1) when coming out of sleep mode. I could fix this only by SMC reset (unplugging power for > 15 sec), after that all ...
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2 votes
0 answers
859 views

MacBook Pro crashing when going to sleep

I have a recently purchased MacBook Pro (16-inch, 2019) that crashes when it goes to sleep. It doesn't matter if I send it to sleep manually through the menu or by closing the lid, or if it goes to ...
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1 vote
0 answers
14 views

Which method of hotspotting consumes the least power from the connected device?

When a MacBook Pro is connected to an iPhone's hotspot through USB-C to lightning, the MacBook Pro will automatically charge the iPhone. This consumes additional power from the MacBook Pro's battery. ...
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0 votes
1 answer
2k views

Where does the pmset CPU_Speed_Limit variable come from, and how to modify it

The man page of pmset states: pmset must be run as root in order to modify any settings. Yet I cannot find out how to alter the CPU_Speed_Limit variable. I'm not a registered Apple developer, but I ...
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  • 101
0 votes
1 answer
591 views

Macbook Air Early-2015 Service Recommended Warning [duplicate]

I have a Macbook Air Early-2015 model since 2017. Like 4 or 5 months ago, I updated from High Sierra to Mojave. Initially there was no problem. But after a few weeks my Macbook started to shutdown ...
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3 votes
1 answer
815 views

How to put MacBook to sleep using only an attached Windows keyboard?

I have a new MacBook Pro that I leave plugged in and closed because I use an external display, keyboard, and mouse. My monitor, keyboard, and mouse are also used by my PC. When I'm finished with work, ...
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2 votes
0 answers
400 views

How to reflash SMC firmware?

MacPro 2013 (MacPro6,1). The computer wake up by it-self after one or two minutes. Re-install new OS. Reset Pram, SMC. Disconnect everything except power cord. Wifi disabled. Auto-sleep after 4 ...
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0 votes
1 answer
333 views

MacBook Pro 2011 has faulty power button - How do I enable any key or lid open boot settings?

I'm working on an Early 2011 MacBook Pro 13" which suffered a little water damage. After cleaning the system I can get it to turn on by disconnecting the battery, then reconnecting it and ...
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2 votes
2 answers
360 views

Why will my MacBook Pro (15" Late 2016) not power on after disabling 'Boot on Lid Open'?

I wanted to disable the boot/power on by opening the lid. To do so, I entered the below command in the terminal sudo nvram AutoBoot=%03 Post that, I shut down the laptop by going to the Top Left ...
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1 vote
2 answers
247 views

Macbook not detecting all USB keyboard keys

I have a Macbook Pro 2019. I recently purchase the Corsair K68 RGB keyboard which has a common USB Type-A connector. I used OTG for USB A to USB C. The first time mac detects the new device. Worked ...
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3 votes
1 answer
528 views

Is there a way to bypass charge a 2019 MacBook Pro?

Bypass charging powers the computer but it doesn't charge nor discharge the battery. Can I bypass charge on a 2019 MacBook Pro?
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0 votes
1 answer
36 views

Is it possible to have the auto display sleep less them a minute some how?

In the System prefernces Energy Saver section you have "Display Sleep" option. The minimum time is a minute. is it possible to tweak that some how to less then a minute? Please don't add ...
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2 votes
1 answer
44 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 ...
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1 vote
2 answers
301 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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1 answer
2k 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 ...
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