Power management refers to the capability of a computer or its operating system to regulate its power usage. This can help achieve cooler and quieter operation, longer-lasting electrical components, and for laptops, longer battery life.

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151
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Should laptops remain plugged in when their battery is 100% charged?

When your laptop's battery is 100% charged, should you leave it plugged in so any battery power doesn't get used, or will that cause overcharging, overheating, etc.? Should the laptop be unplugged ...
31
votes
3answers
26k views

How do you check how much power a USB port can deliver?

Some laptops have a special USB port that can deliver more power than the other ones. However it is not always easy to identify which one is the good one, nor how much power it can deliver. So is ...
30
votes
7answers
35k views

Is turning off hard disks harmful?

I set Windows 7 to turn off hard disks after 20 minutes of nonuse, which it does a really good job at - it seems to turn off individual hard disks that have been idle for 20 minutes exactly. When I ...
23
votes
8answers
132k views

Why does my Windows 7 computer freeze after waking up from Sleep?

Moderator edit: if you have a similar problem, please ask your own question, since it seems there are several things that can cause this situation, it is better to treat each case separately. Hey ...
22
votes
5answers
39k views

What Is Minimum And Maximum Processor State In Windows 7 Power Management?

I am talking about this: What should I set in minimum and maximum? I want good CPU performance but not overheated CPU and fan working like crazy.
20
votes
1answer
18k views

What's Keeping My Computer Awake?

First the question; How do I figure out what is preventing my Windows 7 computer from going into sleep mode? Second; some background... I've been struggling with this for a few days and am utterly ...
18
votes
8answers
831 views

What are some good practices for making sure my laptop battery serves its full life?

Basically, I'm looking for some do's and don'ts. Is it bad to keep my laptop plugged in when I'm not using it (majority of the time)? Is it bad to plug it in once I've finished using it (with it ...
17
votes
8answers
20k views

Is there a way to close the lid on a MacBook without putting it sleep?

Is there a way to close the lid on a MacBook without putting it sleep? This would be useful when connecting the macbook to an external display, for instance. I've never been able to figure it out ...
15
votes
4answers
9k views

What is keeping my PC from sleeping?

How can I find out why my laptop or desktop won't automatically go to sleep
13
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3answers
2k views

Powering down the display in XP with a command

Is there a command to power down the display in Windows XP? That is, a command that causes the video card to stop sending a signal to the monitor until input is received, much as power management does ...
12
votes
1answer
506 views

Power Options: Turn off harddrive. Effective or dangerous?

I keep a PC running 24x7 as it handles several light (processor-wise and disk-wise) tasks and acts as a jumping point into my network from outside. I'd like to keep it as energy efficient as possible. ...
11
votes
2answers
4k views

Find time to charge in Windows 7

Is there a utility for windows 7 which will give me the time remaining until my laptop battery is fully charged. GNOME power manager has this functionality, So i was wondering if there is a ...
10
votes
3answers
30k views

How to turn off the display in Windows 8 without locking or making computer go to sleep?

How to turn of the display in Windows 8 without locking or making computer go to sleep ? The problem is that when I enable ‘Turn off display after x minutes’ feature from control panel, the device ...
10
votes
3answers
4k views

What is preventing my MacBook from sleeping?

I have a MacBook Air and I have noticed that even though I have configured it to put itself into sleep mode after being inactive for 5 minutes it sometimes stays awake. I've usually got a bunch of ...
10
votes
5answers
15k views

How can I make Ubuntu not lock my screen when I close my laptop?

I am running Ubuntu 9.04. When my laptop is plugged into power and I close the lid, it only turns off the screen, so when I open it up again, it comes back right away, and I can give use my media keys ...
10
votes
4answers
2k views

Does my 1000 watt 80gold+ (90% efficient) PSU pull 1111 watts, 1000 watts, or 900 watts from my wall receptacle at 100% load?

Does my 1000 watt 80gold+ (90% efficient) PSU pull 1111 watts, 1000 watts, or 900 watts from my wall receptacle at 100% load? When I plug my 200 watt video card into one of the PCIe power ...
10
votes
2answers
4k views

Laptop randomly waking up = Hibernate / Low Battery?

A (Windows 7) laptop has been annoying me since the day we got it. When it is put to sleep (the lid closed), it seems to intermittently wake up randomly during the night (i.e., 10pm, 1:30am, 7am, ...
9
votes
5answers
693 views

Too much power for 1-2 power outlets in my room? [closed]

I live in the USA, I am curious about plugging in too many computer items into 1 to 2 power plugin outlets. Most power outlets have 2 plugins, some have 4 and more though. Many people will plug in a ...
9
votes
5answers
4k views

My Windows 8 PC wakes up every night around 3 am

I just built a new Windows 8 PC, and started using it a few days ago. Every night, I use Hibernate on the computer before I go to bed. The only way to turn it back on is to hit the Power button. ...
9
votes
2answers
702 views

Laptop wakes from sleep, once, due to audio controller (Windows 7)

The laptop is a recent Dell XPS 15z and the problem is as follows (reproducible about 90% of tries): put laptop to sleep using either Start->Sleep or closing the lid laptop goes to sleep after about ...
9
votes
2answers
905 views

Is it possible to automatically put individual monitors to sleep when not in use?

My desktop computer has three displays, and I usually use all of them at once - but not always. In order to save electricity, I would like a way for monitors to automatically go to sleep when not in ...
8
votes
9answers
18k views

Windows 7 Aero theme when on battery

Windows 7 has the full and basic Aero themes that can be changed inside personalization. Windows used to automatically disable Windows Aero (transparency) when I unplug my laptop from the mains. I ...
8
votes
5answers
9k views

In Windows 7, why won't my display stay off despite the power settings saying it should?

I'm completely stumped by this. My simple use case is that when I'm in bed, I use a cordless mouse to browse the web, watch videos, etc. - the monitor is across the room. When I'm going to sleep, I ...
7
votes
3answers
4k views

Why hibernate Windows 8? [closed]

It seems to me that in Windows 8 classic, hibernate is slower than the fast shutdown. Is there any meaningful reason to hibernate a Windows 8 machine (as opposed to fast shutdown or sleep)?
7
votes
4answers
9k views

What is the hotkey to put my Windows to sleep?

My keyboard doesn't have power-related keys. I would like to enter the hybrid sleep using the keyboard and only with a minimum of keystrokes. If there is none, how do I bind a hotkey to it?
7
votes
4answers
9k views

How to disable the screen (Linux without X)

I would like to know if there is any way I can disable the screen on a linux distro I'm using Debian. I found a few way to do that with X installed, but not without X.
7
votes
3answers
3k views

Possible to force all disk activity to RAM?

I want to tell the operating system to stop using my hard disk and only use RAM as a cache instead. Optimally, I want to tell Windows to: a) pre-cache executable images and necessary bootstrap data ...
7
votes
1answer
622 views

Will a hard drive use less power if it is unmounted?

I recently did the Optibay mod on my 13" Macbook Pro, the stock magnetic drives now lives where the optical drive used to be. And an SSD has taken its place. It's all good, but power consumption ...
7
votes
1answer
988 views

How to remove hiberfil.sys

I have a small SSD and I want to reclain the space currently used by the hiberfil.sys (~4GB) by disabling hybernation or perhaps preferably, move it to an HDD. I see under "power Options" that ...
7
votes
2answers
7k views

PowerTOP for windows? [closed]

Is there something equaivalent to Linux's PowerTOP for windows?
7
votes
1answer
920 views

Does Power-Management Affect a Hard-Drive’s SMART Statistics?

Among the various fields in a hard-drive’s SMART statistics, a few are flagged as “life-critical”, that is, those values determine the primary health of the drive and how long it may have left before ...
7
votes
1answer
338 views

What are the recommended power settings for VMs?

What power options should be changed in Windows when it is running on a virtual machine? We are using VMWare and the possible OS's are any of several still-supported versions of Windows. For example ...
7
votes
3answers
3k views

Windows 7 does not turn off monitor displays

I upgraded my long-standing Windows Vista desktop to Windows 7 over the last weekend, and now I notice my three monitors do not turn off after the stipulated 15 minutes as specified in the Power ...
6
votes
1answer
21k views

Disable “Turn off hard disk after” in windows 7

How can I disable this feature? In the power options apparently I can only choose the minutes and I don't see a "Off" option. If I set it to 0 minutes, it sets itself to 1. For now I set it to ...
6
votes
3answers
7k views

Why does Windows 7 sometimes forget to turn off my display after X number minutes, even though the power settings are specifically set that way?

This is not just a problem with Windows 7 - I know I've been experiencing this same issue all the way back through XP. Basically, you set your screen to turn off after 5 or 10 minutes, you walk away, ...
6
votes
1answer
490 views

is it possible to wake up a Linux device at a specific time

I run Debian on an embedded board. I would like to suspend or hibernate the board say at 10 pm and wake it up at 7 am. There is no problem to suspend/hibernate the board by pmi action ...
6
votes
1answer
5k views

How does windows “limit” the CPU (Power Options / Battery saving)

Can anyone explain how Windows effectively limits the CPU? Last time I tried some tricks to let my laptop not overheat, so I tried limiting the CPU to 70%. As for my suprise it stopped my laptop ...
6
votes
4answers
2k views

Will unplugging my computer/entertainment center every night cause damage?

All squirreled away within a nice little cabinet are the following components of my entertainment center: Pentium-4 based (vintage ~2002) PC Samsung 32" LCD HDTV Netgear Ethernet hub XBox 360 Wii A ...
6
votes
3answers
1k views

Underclocking graphics card in a Linux Server

I recently built myself a new Linux Server with a Core 2 Duo 1,83 GHz CPU and a nVidia GeForce 7200LE graphics card, which was the cheapest passively cooled card I could find. I've measured power draw ...
6
votes
1answer
10k views

What does the the “System cooling policy” under “Processor power managment” on Windows 7 do?

On Windows-7 you have the ability set the System cooling policy to passive. What does this actually do?
6
votes
1answer
7k views

Change power plan when laptop gets plugged in

On my laptop I have the 3 standard Windows 7 power plans. I want my laptop to automatically change the power plan, when I plug in the power to my laptop. I couldn't find this feature, am I missing ...
6
votes
2answers
2k views

Is NTFS fail-safe in case of a power outage?

In case of a power outage, can the NTFS filesystem be harmed? E.g be broken or cause file corruption? And is the NTFS built-in mirroring on dynamic disks guaranteed to keep the files in a consistent ...
6
votes
4answers
11k views

WiFi or Bluetooth controllable power outlet

I am looking for some sort of thing that I could plug a lamp into that would then plugin into the wall that would allow me to control it (ie turn it on and off) via a web interface, or via a web API ...
6
votes
1answer
883 views

Can you hibernate/reboot in Linux instead of hibernate/poweroff?

I'm using pm-hibernate, and would like to reboot the machine after it's done hibernating, rather than having the machine turn off. Is there a way to do this with pm-hibernate, or any other Linux ...
6
votes
4answers
3k views

Close lid option “Do nothing” absent

I just unpacked my new Sony Vaio, with windows 8 pro installed. Everything is nice, so I tried setting my power management options. The "When I close the lid" option only list: Hibernate Sleep ...
6
votes
2answers
5k views

Turn off USB power when closing MacBook lid

I have a USB-powered cooling pad under my MacBook Pro. When I close the lid to put my MacBook to sleep, I would like the cooling pad to turn off. In other words, I would like the MacBook to cut ...
6
votes
4answers
3k views

How can I prevent my wireless mouse from waking my Windows 7 computer?

My mouse is so sensitive that it randomly wakes my computer up even when I don't touch the mouse. I don't want this to happen, so I want to disable the mouse's ability to wake the computer. I know ...
6
votes
1answer
320 views

How to tell Windows 7 “sleep when laptop is closed, unless there's an external monitor connected; then use that”?

Most of the time, I would like my Windows 7 laptop to sleep when I close it. But sometimes, I like to connect an external monitor over DVI. I would like my laptop to use the external monitor when I ...
6
votes
1answer
1k views

GPU at >= 100% for Intel HD Graphics 3000

On my brand new Lenovo W520 (with Sandy Bridge, 2820QM) and with default settings and on battery power, the "Power Manager" status shows that the GPU usage is constant at 100% or larger. Is this ...
6
votes
1answer
192 views

Laptop keeps waking up from sleep (Windows 7)

Laptop is fully charged before I put it to sleep and when I come back more than 12 hours later and resume it, the computer only has around 10% left. I have used the powercfg lastwake and powercfg ...