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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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 ...
18
votes
8answers
833 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 ...
30
votes
7answers
36k 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 ...
22
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5answers
41k 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.
5
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4answers
16k views

Windows 7 Goes to Sleep in conflict with Power Option Setting

My Del Dimension E521 running Windows 7 puts itself in sleep mode each night -- despite the fact that I have chosen a power option that specifies NEVER Each morning I find the monitor blank and I ...
31
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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 ...
5
votes
4answers
9k views

Should I turn off my PC when plug/unplug external display?

Should I turn off my PC when plug/unplug external display? Some people don't do that, but I think this is required to keep safe your equipment. Am I correct in thinking this?
13
votes
3answers
3k 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 ...
4
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4answers
1k views

Minimize power usage of Windows file server at home

We are setting up a home file server (most likely running Windows Home Server) that will always be on. There will be a mix of older hardware and some new components. The box does not need to be ...
11
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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 ...
11
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2answers
5k 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, ...
7
votes
1answer
928 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 ...
4
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2answers
4k views

What do different values of hard drive's Advanced Power Management feature (hdparm -B) affect, except spin-down?

hdparm's -B parameter is documented as: Get/set Advanced Power Management feature, if the drive supports it. A low value means aggressive power management and a high value means better per‐ ...
6
votes
1answer
6k 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
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, ...
4
votes
2answers
3k views

Is a laptop damaged by always keeping it plugged in?

If I keep the power cord plugged in all of the time, will it damage my laptop?
4
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2answers
3k views

Is there a way to execute a program on power events?

I'm basically looking for a way to execute an application when my laptop transitions to battery power and, similarly, when it returns to AC. Is there a built-in hook in Windows or a third-party ...
2
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1answer
433 views

Visible Power Plans In Shortcut Menu

How do you choose which power plans are visible when you click on the battery in the notification area?
3
votes
3answers
2k views

Windows 7 PC no longers goes into power saving mode

Recently, my computer stopped honoring the power saving settings. It stays on all the time, even though I have it set to go into sleep mode after 20 minutes of inactivity. It used to work as ...
2
votes
2answers
2k views

Processor not running at max speed

My laptop has an Intel Core 2 Duo T9300 which should be running at 2.5GHz, however CPU-Z consistently reports my Core speed at right under 1.6Ghz (8x multiplier and ~200MHz Bus Speed). Even when I'm ...
0
votes
2answers
1k views

Triggering tasks and running programs when Windows 7 is plugged in or unplugged? [duplicate]

Possible Duplicate: Is there a way to execute a program on power events? Is there a Windows event that I can watch in Task Scheduler that will trigger when the power is plugged in? And an ...
23
votes
8answers
133k 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 ...
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 ...
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
2answers
7k views

PowerTOP for windows? [closed]

Is there something equaivalent to Linux's PowerTOP for windows?
5
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7answers
6k views

How do I lower power consumption of my computer

My electricity bills are high and my Dad keeps shouting me for that (I use my computer over 20 hours per day). Below are the few things I am curious to know; How do I lower my Computer Power ...
4
votes
1answer
95 views

Is it more cost efficient to keep my computer on and allow it to go into S4/Hibernate? [closed]

I have a desktop PC and and it goes into S4/Hibernate after about 1/2 hour of it being on. Is it wasting electricity by turning it on and off and not just keep it on overnight in S4/Hibernate?
4
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2answers
7k views

is there a way to force a computer into sleep mode at certain times?

for example, to save electricity. Could you make a domain policy that makes a pc go to sleep between the hours of 9 pm and 6 am. You can always turn it back on. It just goes to sleep unless it's ...
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 ...
3
votes
1answer
2k views

Why doesn't my laptop battery charge while the laptop is in use?

Up until a week ago, my laptop has always been able to charge the battery while I'm using it. Now, it will not charge unless the computer is sleeping, hibernating, or turned off. The icon in the ...
6
votes
1answer
492 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
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 ...
5
votes
1answer
5k views

No Hybrid Sleep in Windows 8?

As you can see below, there is no hybrid sleep option like there is in Windows 8. Is it enabled by default with sleep or hibernation or is it gone entirely? <- Windows 8 vs Windows 7 -> Edit: ...
5
votes
2answers
324 views

Reduce power use on computer

I watch a lot of movie's on my computer which is connected to my TV. Problem is i built the pc to be a gaming computer and it has the power supply to match (1200w). Is there a way to set it into a ...
4
votes
6answers
9k views

How to disable power to USB ports when laptop is in sleep mode

I have a Windows7 laptop with two external 2.5" HDDs and a cooling pad connected through USB ports. When I put the laptop to sleep, these devices are still powered on - the fan in the cooling pad is ...
1
vote
0answers
758 views

Dynamically disabling cores in a power-efficient way?

I am looking for a mechanism to dynamically disable cores in Linux in order to minimize power consumption. Unfortunately, disabling cores using the following simple approach actually increases power, ...
10
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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
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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 ...
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 ...
7
votes
1answer
996 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 ...
6
votes
1answer
889 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
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?
5
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4answers
29k views

Why does my screen dim on a desktop installation of Windows 7?

Periodically, while using my Windows 7 Pro desktop installation, the screen suddenly dims. The brightness is about 75% normal (estimate). It's as if I am in a power-saving mode on a laptop running on ...
4
votes
3answers
262 views

Is it possible to reduce graphic processor power consumption?

Is it possible to reduce graphic processor power consumption? My notebook powered with nVIDIA GT230M graphic processor and its power consumption is about 45W, it eats my battery! Other Specs: ...
4
votes
3answers
139 views

Protecting a Laptop in a Surge-Ridden Area

I am traveling to Nepal with a laptop, where power frequently surges and wanes (brownouts). What do I need to protect the laptop? A surge protector? Voltage regulator?
3
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3answers
2k views

Computer hangs due to underpowered UPS?

I just bought a new UPS. Now since I started using it I experienced at least 3 random freeze in Windows 7 and it happens during the first 10 minutes of start-up. Note when I say freeze, I mean I ...
2
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1answer
1k views

Ubuntu 10.04: put computer to sleep when inactive for 4 hours

Under the power management tab, I have the option to put the computer to sleep when inactive for 10 minutes, 30 minutes, 1 hour or 2 hours. Is there a configuration file I can edit to add 4 hours to ...
2
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1answer
4k views

Windows 7 RTM: Loopback SMB over TCP/IPv6 connection preventing sleep mode

I'm running Windows 7 RTM with homegroup, network discovery, file and printer sharing, public folder, media streaming and Windows Media Player Network Sharing Service all turned off, but the computer ...
1
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0answers
733 views

Wired network adapter doesn't function properly when starting Windows

Every time I start my computer, my wired network adapter stops working - this includes a cold start and resuming from sleep. If I head over to Network and Sharing Center and click Troubleshoot ...