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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Laptop will not power from battery

I have an Acer Aspire 7551G that will not power from battery, the AC adapter must be connected for the machine to boot and as soon as the adapter is removed the laptop instantly dies. The contacts ...
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32 views

Ubuntu: Do not show display state when resuming from hibernation

I'm using Ubuntu 13.10 saucy on my laptop. The device is set up to suspend when the lid is closed, prompting for the password when resuming. However, when I resume, the last state of the display ...
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321 views

Wake-on-lan from S5 and prevent network card from turning off

I'm tired googling and looking through hundreds of forums, please help. OS: Windows 7 64-bit Motherboard: ASUS M4A77T/USB3 Onboard network card: Realtek® 8112L The problem is that network card keeps ...
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1answer
38 views

Is an event registered when a monitor comes out of Power Saving Mode?

I am using task scheduler to fire a program when someone logs in, unlocks the station, and I would like to do it when the screen turns back on prior to locking. IE the power savings turns off the ...
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1answer
779 views

Disabling AppNap for Terminal

How do I disable AppNap for Terminal? Get Info on Terminal does not have Prevent App Nap check box An alternative is to turn the NSAppSleepDisabled flag on, but will it actually work? $ defaults ...
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0answers
75 views

How to force Windows Battery/Power notifications to display over RDP sessions

I have fast machine with SSDs and when the low battery notification for 10% etc pops up, I don't always see it if I'm working in a full screen RDP Session. I've set my PC to hibernate on low battery, ...
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2answers
318 views

Windows won't sleep

My Windows 8.1 PC suddenly decided it no longer wants to go to sleep. If I explicitly put it to sleep then it stays in sleep mode, but it doesn't obey the power plan setting to go to sleep after 30 ...
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1answer
399 views

turning display off while playing video file in vlc player

Does there is any option or settings (native to vlc player or windows) to automatically turn off the display when playing a video in it.. Could be handy when want to listen only to audio and making ...
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70 views

Closing the lid of my notebook doesn't have any effect

When I close the lid on my Samsung 900x3c-A01 nothing happens, both on Windows and Linux... I've made double-sure all the OS' settings are correct, I even tried to set them up so they would shut down ...
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94 views

Reducing CPU load to absolute minimum

I have had a couple of things gone missing I believe stolen in my shared apartment and want to run my laptop constantly with a webcam attached, running webcam surveillance software to record/ take ...
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2answers
302 views

How to limit my CPU power programmatically on Windows 7?

Whenever I run a CPU-heavy activity (like compressing a big set of files into an archive for example) my CPU switches to its full throttle (maximum frequency) and shuts down of overheat in less than a ...
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1answer
688 views

really disable power save in linux wifi

I've got a laptop with an Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34) (using iwlwifi kernel module). Although power_save (a module parameter) is disabled, I can see 802.11 ...
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0answers
66 views

Disable screen power save mode when external monitor connected

I have a laptop with a HDMI connector (NVidia gfx), is it possible to stop the screen from going into power save mode only when I have something connected to the HDMI connector?
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50 views

Setting HDD Turn Off per disk

I can only find a setting that is applied to every HDDs. What if I have multiple disks on my system and want to set different time for each disk? Is there any way?
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1answer
62 views

How effective is to blacklist GPU to avoid power consumption? [closed]

I blacklisted my NVIDIA graphic card by putting it in /etc/modprobe.d/blacklist.conf, I would like to know how it reduces my power consumption
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2answers
169 views

On windows, how to force application close upon going to sleep

Is there a scripting possibility or application, free or commercially avaible, that would allow me to set up windows to close a partuicular application before it goes to sleep mode?
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2answers
1k views

Underclocking Haswell for power saving

I have been reading up on Intel's new Haswell processors, and it seems that the K-series is designed for overclocking. But what if I want to underclock? Do I still need to buy a K-series processor? ...
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0answers
49 views

Ubuntu sleeps after disconnecting power

I've Lenovo S400 laptop, dual boot with windows 7 and ubuntu 13.04. The problem is that whenever I disconnect the power adapter, ubuntu shows that that battery level is critically low and goes to ...
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1answer
630 views

powercfg.exe not working properly

os:Windows 8 pro x64 build 9200 (fully updated) I want to change the closing lid function through command line with powercfg.exe, so I gathered the required GUIDs and executed the following command: ...
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1answer
39 views

manage hardware power supply

How can I manage power supply? (if it's possible of course). Since my charger doesn't supply the needed energy, I need to reduce/remove power from some devices in order to let my processor run full ...
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1answer
3k views

What could be causing windows to fail to sleep or hibernate, and revert system settings?

I am running Windows 8.1 on my system (Dell e6520) and the symptoms are this: My PC won't sleep or hibernate. It the screen turns off, but the fans just run and run, and after a little while, it ...
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1answer
378 views

extract power plans from saved registry

I need to restore Windows 7 power plans. I saved full registry on an old PC (also Windows 7), that PC is not available any more. How can I extract power plans from the saved registry?
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1answer
181 views

Power scheme not applying in Group Policy

I've created a new GPO and created a power scheme under computer configuration. I've disabled the User configuration part of this GPO. In this power scheme I have the action selected to create a new ...
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2answers
296 views

Low processor performance after removing and then plugging the power cord

It's really confusing. When plugged in, everything is lagging. On battery everything goes smooth, three times as fast. I looked into power options, set everything to default and tried the three ...
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1answer
725 views

Off vs standby. Which is better for an office laser printer?

At an office where I work, there is a Samsung CLP-310 laser printer: The staff turn this off every evening. Right off -using the hard power switch on the back. They are trying to reduce their ...
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1answer
56 views

PC turns off abruptly [closed]

I had to press my PC's power button for about 60 to 90 seconds to turn it on. After it boots it works for about one hour. After this hour the monitor goes blank. Power and hard disk LEDs are ok with ...
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2answers
213 views

Is it safe to add or remove any type of device while in sleep mode?

Is it safe to add (plug in) or remove (unplug) any device while Windows is in sleep (a.k.a. standby, a.k.a. suspend) mode? What type of devices can be added or removed in this manner? Can you do this ...
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0answers
45 views

Is it possible to use IGP and Dedicated graphics like nvidia's optimus? [duplicate]

Pretty much like the title says. I'm curious if it would be possible to use my dedicated graphics card for gaming and other intensive tasks, while using my IGP for general usage to get power usage ...
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2answers
1k views

Execute a command if Linux is idle for 5 minutes

I would like to execute a command such as notify-send 'a' if my Linux machine has been idle for 5 minutes. By idle, I mean the same thing a screen saver that gets activated would use to define ...
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1answer
129 views

How can I view events that cause laptop screen to turn on from standby (but not sleep)?

On a Windows 7 laptop, is there a way to see exactly what device or process triggered the screen to turn on? I'm referring to the "screen off" mode where the notebook is still on, but the screen has ...
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2answers
226 views

Hook system power button in Windows

I have a headless computer running a custom service that I want to enable/disable using the power button, rather than having to remotely connect every time. The computer does other things as well, so ...
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0answers
68 views

Computer randomly powered off at exactly 3 am

I am running a Zentyal server at home, set up to run as a gateway, file server, etc. It is running on a fairly standard computer with standard hardware (Intel i3, 8GB RAM, 300W power supply). A few ...
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1answer
340 views

Monitor turns on when computer accessed remotely by Remote Desktop user

I am running Windows 7, service pack 1, 64-bit, NVIDIA GeForce 8800 GT. I used Power Options to configure the monitor to turn off after 10 minutes of inactivity. This works fine when I use the ...
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2answers
3k views

Windows 8 custom power plan keeps resetting itself

I just got a new Haswell laptop, and was experiencing very short battery life: about 3-4 hrs with minimal use. I knew this had to be wrong, so I checked the power plan, and found that "HP Recommended" ...
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1answer
2k views

How to disallow USB devices to wake the computer by default in Windows 7

Every time I plug in a new mouse/keyboard or plug an existing one to a new USB port, I have to manually go to the device manager, go to the device's property page, and uncheck "Allow this device to ...
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2answers
310 views

Do ULV Core i5 CPUs consume same power as i7 CPUs if they use same TDP?

Title says it all really: If you have a Core i5 CPU and its TDP is 17W and there is a Core i7 CPU which also has TDP 17W, will they consume the same battery power even though one runs faster? I am ...
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1answer
332 views

How do I detect Windows turning on/off display (going to away mode)?

I'm trying to find a way to detect when my computer decides I've been away (no user input) long enough to turn off the display. That also means I'm not watching movies and the OS is not prohibited ...
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1answer
1k views

disabling power save option on wifi device

I use usb wifi dongles that have AR9271 chipset and use compat driver 3.9.1 - ath9k_htc. I use the wifi units to create an ad-hoc wlan. When there is no communication for a while, the nodes leave ...
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3answers
2k views

Modify “plans shown on the battery meter”

I always use Power Saver or High Performance. No in between for me. How can I rearrange the plans so that those are the two in the top section?
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2answers
56 views

How to Lower Power Consumption while still running tasks? [closed]

On my pc, I have Norton 360 installed. Since it takes up lots of resources, I usually just leave it on while I let it scan my computer, but I'm starting to think it takes up a lot of power. Is there ...
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1answer
42 views

Dynamic Power Usage

This is more of a theoretical question, but if it is actually possible, I'd definitely like to look into implementing it. Basically, I'd like to have my computer (Core 2 Quad Q6600, Nvidia 8800 GT ...
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1answer
1k views

Windows 8 on Surface Pro goes to sleep on lock screen despite “High Performance” power settings

On a Windows 8-enabled Microsoft Surface Pro I have a "High Performance" power mode selected. When the device is locked via Win + L it still goes to sleep after a minute or so. Screen saver is ...
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0answers
44 views

Can I prevent Windows 7 from restoring my brightess setting when the power state changes?

I have a question regarding Windows 7. I have set different values for the screen brightness when on battery and when on AC power (in the power plan settings). If I manually change the brightness of ...
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0answers
292 views

Battery alarms and notifications don't work in Windows 8

It's about some months that I have a strange problem with my laptop battery. In the past, whenever my laptop went about 10% of battery, my operating system Windows 8 showed a notification alarm to ...
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5answers
5k 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. ...
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3answers
898 views

What is the difference between an USB hub with external power and without?

I have a 7-port USB 2.0 hub (this) which comes with external power supply in its packaging. However, when I connected a lot of USB sound cards (Creative SB X-Fi Go Pro! or ASUS Xonar U3) to the hub I ...
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1answer
39 views

Mac OS X sleep mode

I am a new Mac user. I need to return to the MacBook continuously with varying amounts of time in between. However, the Mac goes into sleep mode breaking the tasks it was doing. I have figured out ...
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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 ...
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445 views

windows 7 professional desktop goes to sleep even after setting sleep to “never”

Dell desktop goes to sleep and prevents my being able to log me in even after I set the power settings to never sleep mode. I have checked whether its hibernating and it is not. Wonder what other ...
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2answers
280 views

How do you make the computer locked when the monitor is turned off but power not off in Windows Vista?

I have a power management setting (set up through the Control Panel) that turns the monitor off after 5 minutes of idling but keeps the power on all time, if the laptop is connected to power. Under ...