Questions tagged [power-management]

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

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17 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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1answer
51 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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2answers
95 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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2answers
248 views

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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91 views

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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1answer
153 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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0answers
211 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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1answer
91 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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24 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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19 views

How to Auto-Enable Low Power Mode when iPhone is on Standby

Is there a way to have an iPhone automatically switch to Low Power mode when it's in Standby? I can use Automation to switch to Low Power mode when an app is closed, but if I press the power button to ...
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1answer
39 views

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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57 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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1answer
249 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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34 views

Macbook Pro 2016 - Big Sur Battery Issue after replacement

Background - i bought a 2016 Macbook Pro (A1708) a few weeks ago that was at 800+ cycles and the battery was listed as "service recommended", would not charge past 1% and switch off if ...
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46 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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1answer
48 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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17 views

MacBook Pro 2019 (macOS Catalina) - Is it possible to automatically increase screen brightness to 100% when plugged in?

Currently - when unplugged, the screen brightness decreases I want to keep this functionality, but in addition I want the screen brightness to automatically increase to 100% when plugged in Is there a ...
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32 views

Downgrade bootrom version on MacPro6,1

Is it possible to downgrade a bootrom on MacPro6,1 to a older version? I have read a bunch about SMCFlasher tool and How to downgrade SMC firmware (which doesn't seem valid anymore) amongst others, ...
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7answers
4k 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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1answer
43 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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1answer
118 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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3answers
266 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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24 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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95 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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161 views

MacBook Pro battery does not charge when plugged in unless switched off / sleep

Hello Apple Stack Exchange! Apologies if this is a repeat question, perhaps because everything is a repeat answer as well is why I am here. I am having a problem with my MacBook Pro (A1398, 15”, early ...
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1answer
75 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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19 views

MacBook Pro Mid 2009 17 inch ONLY boots after resetting SMC

I changed the right speaker, which required me to remove the logic board. I put everything back together and it turned on normally. When I was done using it I shut it down. After this I could not boot ...
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2answers
94 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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0answers
579 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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0answers
12 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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1answer
912 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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1answer
441 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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1answer
291 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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0answers
242 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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1answer
165 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 ...
2
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2answers
184 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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2answers
162 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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1answer
338 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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1answer
30 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 ...
2
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1answer
36 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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2answers
291 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
1k 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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1answer
48 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
72 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
21 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
74 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 ...
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1answer
23 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
621 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 ...
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1answer
126 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 ...
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1answer
115 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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