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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Windows software to show computer's energy usage or battery discharge rate

Is there any software for Windows 7 which can show a computer's energy usage in real-time? I am currently using Battery Bar, which gives an estimated discharge rate, but this is essentially an average ...
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What is “Link State Power Management”?

In the Windows 7 Power Options, under "PCI Express", I can adjust "Link State Power Management". The options are: Off Moderate power savings Maximum power savings What do these settings do? Is ...
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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?
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How many watts do case fans generally use?

I'm deciding between a 500 watt PSU and a 600 watt PSU. I currently have a 460 watt PSU that powers everything but my dvd drive, spare hard drive, and 2 fans. I've determined 40 watts is enough to ...
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722 views

Do Any PDUs/Power Strips That Plug Into A 14-30 Receptacle Even Exist?

I am hoping to turn my laundry room into a mini data-center. My dryer takes a 4 pronged, 120/240v NEMA 14-30 receptacle. Most all PDUs seem to have NEMA L6-30 plugs (3 prongs, twist lock). ...
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Using different SSDs types (not only SATA based) as system drive

Currently I have a Thinkpad X61s and want to make it both a bit faster and a bit more power efficient. For that reason I thought that adding SSD drive would make most sense. Unfortunately, because of ...
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Can I download files while Windows is sleeping?

Can I? If not is it because in the low energy mode the network card or the hard drives shutdown? If they do is there any way to prevent this (ie. with a custom low energy mode)?
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Temporarily turn off power management / screensaver for watching movies

When watching a movie on my PC (in a flash player widget in FireFox on Windows Vista), I would like to be able to tell my PC not to switch the screen off or put the screensaver on. Now I can go into ...
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What package should I use for laptop-mode on Ubuntu?

I've been puzzled, Ubuntu repository has two conflicted packages, laptop-mode-tools and ubuntu-laptop-mode. I can't find any information about differences in those packages, which one is better and ...
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1answer
223 views

Windows 8.1: How to tell power management to ONLY TURN SCREEN OFF when closing the lid?

I was expecting to find another option in my laptops power management when I close the lid, but all I found is those 3 options: Do nothing Sleep Shut down In an old ThinkPad running Windows 2000 ...
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1answer
102 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?
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847 views

Automatically disable devices to save power and mitigate DMA attack in Windows 7

Some OEM include energy saving apps that can switch off certain devices such as webcam or optical drive. Is there any brand-agnostic app out there that can do it? If the list of disabled device is ...
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1answer
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Vista laptop keeps waking up a minute after I put it to sleep

I have used the command powercfg -lastwake to determine what is waking up my computer. Here is what it produces in prompt Wake History Count - 1 Wake History [0] Wake Source Count - 1 Wake ...
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1answer
554 views

Ubuntu - application-specific power management

I listen to lots of music while doing non-computer related stuff and my laptop falls asleep after 30 mins, as per my power settings, so I have to go back to the laptop to wiggle the mouse every now ...
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1answer
201 views

Spin down hard drive while on treadmill (or car or any other shaky environment)

I have a laptop with 8GB of RAM running Windows 7. Is it possible to completely shut off the hard drive while browsing the web? I use Firefox. I figure I would need to do this if I wanted to prevent ...
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3answers
443 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: ...
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1answer
844 views

Detect when hard disk goes to sleep

Is it possible to trace when Windows turns off a hard disk (due to the power saving threshold being met)? I'd like to see when (if at all) the disks are being turned off.
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Diagnose slow wake up from sleep

My new work computer (Dell Precision T3600, 16GB RAM, SSD) running Windows 7 takes roughly 40 seconds to wake up from sleep mode. How can I diagnose what's taking so long? And what can I do to reduce ...
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Understanding battery information

My laptop is Lenovo T400 and OS is Ubuntu 10.10. Here is information about my battery: $ cat /proc/acpi/battery/BAT0/state present: yes capacity state: ok charging state: ...
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How to definitely turn off “display sleep” in Ubuntu?

After turn off "display spleep" it Power Management the screen continue to slow go dark after some minutes of inactivity. How/where to turn off this? --update On AC Power (I never use it on batery), ...
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167 views

Linux: Real-time Battery Power Usage

Is there a package for getting an accurate reading on the current total battery power usage in Watts on any system?
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337 views

Why won't PC laptop completely power off after upgrade to Windows 10?

I have recently upgraded from Windows 8.1 to Windows 10 and it appears that it mostly successful. By and large I'm pretty happy with the upgrade however there is now a problem with turning off my ...
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What causes “The speed of processor 0 in group 0 is being limited by system firmware” in the event log?

My Windows 10 event log continually states. In fact, I think my system is slowing down due to this fact. The speed of processor 0 in group 0 is being limited by system firmware. The processor ...
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1answer
566 views

What is preventing my computer from going idle?

When I first boot my Windows 7 computer, it will go idle if I stop using it - first the screensaver comes on, then the computer goes to sleep after a certain amount of time. This is the expected ...
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1answer
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Why doesn't a phone li-ion battery die for 5 years and a pc li-ion battery dies in 1-2 years? [closed]

WHat is the major factor? heat?,size? consumption style like full discharge?
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1answer
565 views

How to reduce power consumption on laptop when running Ubuntu

I am having Ubuntu 10.04 on my laptop. The battery doesn't last as long as it does when on Windows. Any thing we can do to improve it ? Its a Lenovo Y410 notebook with core 2 duo processor and 2 ...
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How to automatically shutdown laptop if unplugged

I want my laptop to shutdown automatically after it gets disconnected from power. Can someone tell me if there exists some app for this for Windows 7
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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 ...
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What is the “known hardware incompatibility” that disables PCIe Active State Power Management? How do I fix it?

I'm on Windows 7. I just ran a Power Efficiency Diagnostics Report through powercfg -energy and I got this error: Platform Power Management Capabilities:PCI Express Active-State Power Management (...
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1answer
171 views

What is the minimum length of time it is worth hibernating my laptop? [closed]

I have a Windows XP laptop. I rarely reboot and usually just hibernate it when I'm finished using it. If I'm going for lunch for an hour for example, I will always hibernate. However, if I'm just ...
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Will a 300W UPS work fine if my PSU is 500W?

I am getting a UPS (Uninterrupted Power Supply), currently here are my options: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=BE500R-PH https://www.apc.com/resource/...
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At what point does shutting a computer down become preferred to leaving it on from a longevity standpoint [closed]

As the title says. Basically, I have two small home NASes, one that backs the other up. Each has a bunch (5) of 2TB drives in RAID5. I'd like to turn the backup NAS off, but I run daily syncing. ...
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Is there analog of aticonfig --set-powerstate for open source radeon driver?

I'm running Ubuntu 9.04 on relatively old laptop with ATI Mobility x600 inside. On the last version of Ubuntu, when I was able to run proprietary fglrx driver, I was able to slow down graphic card by ...
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USB Suspend: USB Device not Entering Selective Suspend

After running the powercfg /ENERGY command, I get the following Efficiency Diagnostics Report with 6 errors: USB Suspend:USB Device not Entering Selective Suspend This device did not enter ...
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Let any exe prevent system sleep/hibernation in windows [duplicate]

Is there a way to have Windows system standby prevented in the event that a particular executable is still running? I know playing videos does this semi-automatically but I'd like to apply this ...
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Does a computer screen consume more power to display black or white? [duplicate]

Possible Duplicate: Does it save battery to have your desktop background set on a dark color? Is there considerable energy saving using a black background on my website? My VAIO advised me ...
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Likely reason for not being able to power on an older computer?

I demoted my older desktop computer to a server a short while back and it has always had some sort of problem with powering on after a complete power loss. For instance, right now it's powered on and ...
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How do I stop laptop from underclocking?

My Dell M1530 never seems to run at its full clock speed, regardless of the tasks I throw at it. To diagnose this I have my Dell M1530 configured to use 100% CPU clock speed at all times (regardless ...
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How to keep a hard drive from going to sleep?

I have two hard disk drives in my Windows 8 desktop. The issue I am having is that the secondary hard drive goes to sleep frequently (I assume do to inactivity while I am only using the primary drive.)...
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How to plug-in this hard drive?

I need to install this hard drive "WD800JD-60JRC0". It is Serial ATA. But what really confuses me is that it has molex connector. I think I can plug what I want: SATA power cable or Molex. But which ...
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Does a graphics card use electricity if it's installed but not being used?

I unattached my monitors from my PCI-E video card and attached them to the onboard video card. I'm not using the PCI-E card anymore. Is it using any electricity? Should I uninstall it? Will I save ...
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3answers
175 views

How do I save power when Idling?

Let's say my computer is downloading a huge update, or maybe I want to perform a slow virus-scan that's likely to take hours. The question is, my machine is gonna be up all night, sleep/hibernate is ...
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Are there any benefits to ejecting my internal hard drive?

I have an SSD in my MacBook Pro as my boot drive. It also houses all of my applications, documents, etc. I replaced the optical drive with a mount for the original hard drive, which I only ...
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1answer
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Power loss on home server setup

I have a mac mini server running at home. It acts as a web server and a file server. Recently, they have been doing construction on my street, and power will dip on and off 2 to 4 times per day. I ...
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In Ubuntu 9.10, how do I disable the “Your battery may be old or broken” notification on log in?

Every time I log in, I get this message. It's helpful to see once, but I don't need to see it every time I log in. Is there any way to disable it?
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What is the recommended delay to put LCD/LED screens to sleep?

My LCDs and LEDs screens are configured to enter sleep mode after 5 minutes of computer inactivity, and I have being using this setup for years. Today, I was wondering if I could lower this delay, ...
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Processor energy management in Windows 7

What does it mean to set the cpu's top performance at 60% under a Windows 7 power plan? I have an intel atom processor at 1.66Ghz, does that mean it will act as underclocked at 1.00Ghz? Or are there ...
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Forcing Windows to be 'awake' during certain hours?

I'm running Windows 7 and have the power options currently set up to put the machine to sleep after 2 hours of inactivity. Is there any way to force the machine not to sleep between certain hours, or ...
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How can I monitor battery state on a laptop running FreeBSD 8?

Is there any console tool that can be used to view battery status on a laptop (Dell Vostro A860) ?
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Windows Power Plan automation

I like to keep my Asus ROG G750JZ(laptop) on all the time and I have already automated sleeping at 01:00 in the morning, auto wake-up on opening the lid. However since I am not using the laptop all ...