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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974 views

Linux suspend or sleep on lid close

How can Fedora 17 (LXDE spin, if it matters) be configured to sleep or suspend when the lid of a laptop (Lenovo S10 netbook) is closed? With a 'stock' installation (from the LXDE spin live CD), ...
1
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1answer
682 views

How to script the Windows 7 'sleep' command

To clarify, when I'm talking about 'Sleep' I mean Hybrid Sleep, i.e. save the contents of RAM to the hibernation file and then go in to Standby mode. I have this working perfectly fine via the start ...
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1answer
1k views

Windows 8- sleep mode is drive ON?

Does HDD in Sleep mode under Windows 8 still spins - as it's saves your RAM into HDD? I'm concerned about hdd when carrying laptop around in a bag when it's in sleep mode. Or it is Hibernate which ...
7
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3answers
3k 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)?
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1answer
455 views

How to stop Windows 7 from reducing screen brightness when operating on battery?

Every time I turn the laptop on while not plugged in and working on battery, the screen brightness gets reduced automatically down to about 50-60%. When I plug it in, it remains at that level so I ...
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0answers
74 views

Making Windows 7 ignore the first click/keystroke when screen is off

I find this functionality very convenient in OS X, any way I can get Windows 7 to behave similarly?
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4answers
741 views

How to track which program causes my harddrive to spin up

I have a strange problem: Every half hour one of my hard disks gets powered on again. I recognize this by the sound of a hard disk spinning up. So far I was not able to track which program could ...
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5answers
6k views

windows 8 screen shutting off too soon

I went to the power options and changed the settings to make it wait ten minutes before shutting off the screen, but the screen still shuts off after a minute, I've tried setting different time ...
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2answers
783 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 ...
2
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1answer
175 views

How efficient is Windows 7 in using battery power as compared to Windows XP in similar power plans?

Windows XP didn't have Aero glass and other visual effects and shadow indexing (for fast search) that probably consume extra power in Windows 7. I wonder if disabling some of those features will save ...
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0answers
84 views

Hard disks power down, even when set to “never” in “Power Options”

In Windows XP: A few of my hard disk(s) power down occasionally, even when I have set them to "never" turn off, in the Control Panel's "Power Options", and even saved the new power-theme. What do I ...
3
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1answer
150 views

Windows Power Options Clarification

So I was looking through the Windows 7 power options via Control Panel today, and I realized I had a couple of unresolved questions as to the nature of various choices. I was wondering if someone ...
2
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1answer
264 views

Samsung LCD 214T gets stuck in power saving mode

I've had this monitor (Samsung 214T) for more than 5 years, and had to replace the capacitors a couple years ago. It still works beautifully, but it's always had a similar problem that when I ...
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1answer
134 views

Setting charging limit on MBP?

Is it possible to tweak settings so that the battery will only charge up to 90% -95% and then use power adapter to run ? A friend told me he was able to set such limits on his non-mac PC so I was ...
3
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1answer
287 views

Windows 8 randomly powers up pc?

I have installed Windows 8 PRO on my Asus UX31E (Zenbook) and sometimes happens that after I leave it charging after powering it off, I found it powered up (actually I found it in sleep mode because ...
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1answer
607 views

How can I tell if my computer went to sleep?

I'm trying to work out if my computer has actually fallen asleep, I have set it to fall asleep, but it restarts so quickly, I cannot tell if it was actually having zzzzs or not. What logs are there ...
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2answers
502 views

Leaving the charger in the laptop after it is fully charged [duplicate]

Possible Duplicate: Should laptops remain plugged in when their battery is 100% charged? Is there any problem if I left the charger connected to the laptop after full charging? And if there ...
1
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4answers
4k views

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 ...
4
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1answer
93 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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1answer
571 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 ...
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2answers
2k views

Power LED always stays on after shutting down the laptop

I am using a Dell n5050 laptop, recently I noticed that I have a problem with my laptop. Namely, the power LED always stays on after shutting down the laptop. I've found two options: long press of ...
0
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1answer
219 views

how to prevent local user from rebooting/shutting down when i'm ssh'd in?

I am currently remotely upgrading a friend's computer with aptitude through SSH. I have bad memories of unstable systems when they are rebooted/shut down during an upgrade process, so I'd like to ...
3
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1answer
253 views

CPU clock scales down so computer is unusable after switching to battery

When I am plugged in my laptop runs great however when I unplug it and I'm on battery power my CPU clock speed scales down pretty much all the way. I know this is happening by monitoring the clock ...
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0answers
281 views

Computer does not turn off, stuck in weird hibernation

Ok, So this problem is starting to occur in a lot more computers than one in our network. We have several Dell V131 that when going into sleep mode seems to Shut down all USB-ports Internal Keyboard ...
3
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3answers
765 views

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
109 views

Power Management software for Ubuntu 10.10

I am using ubuntu on Virtual Harddisk. THe problem is when ever I use ubuntu on my laptop, the laptop goes crazy, Screen Brigtness is high and I can't lower it, Processor usage is 100% and Laptop ...
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0answers
392 views

Windows 7 hangs after going into sleep a second time

I've searched everywhere around Google and can't figure out why this is happening so I decide to ask here to see if anyone has a problem like this. Like it says in the title, whenever I sleep ONCE ...
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2answers
2k views

Processor Maximum and Minimum state missing from Power Options

Restarted my laptop after all-night torrenting, and when the exhaust fan felt unusually warm, I notice the setting is gone, my CPU is running on max-speed no matter what profile I choose (even ...
3
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1answer
225 views

USB device power management?

I'm having a problem with a USB-to-RS485 adapter on Windows XP. This laptop is running a data logging program, and the adapter is connected to a temperature chamber. After a couple of hours of ...
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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, ...
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2answers
1k views

Notebook Shuts Down when i close the lid

Recently i bought this notebook. After i install Windows i made my default power settings. As in my settings, it should sleep in all conditions; Power button, sleep button, Closing lid. However the ...
3
votes
1answer
4k views

How to disable screen shutdown after 1 hour in Fedora 17 (Gnome)?

Fedora 17 doesn't seem to have a "Never" option for the screen timeout setting. Is it possible to disable this power-saving feature? This is for a machine showing a dashboard which should always be ...
0
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1answer
551 views

Wireless USB keyboard and mouse can wake system, but then receiver is inactive

I have a Microsoft brand USB device that acts as a receiver for a wireless Microsoft Keyboard and a wireless Mouse. When it's operating normally, there are LEDs on the device indicating Caps Lock, Num ...
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0answers
4k views

Why does my display dim then get brighter on my HP laptop [closed]

I'm posting this question actually with an answer so as to maybe help others who have experienced it. Now, please keep an open mind... I recently purchased a new HP notebook running Windows 7. I like ...
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0answers
76 views

No monitor after Windows 7 update

I recently installed Windows 7 on a Toshiba Satellite laptop. After updating, my machine would start but the screen remained off. I was able to fix this by connecting an external monitor. The ...
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1answer
337 views

How to stop my laptop from throttling my CPU?

I have an AMD TL-60 mobile processor. I've noticed that often when I watch videos, I get a really jerky playback. I can fix it if I run the following command: echo 2000000 > ...
8
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5answers
8k 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 ...
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0answers
473 views

Windows 7 won't wake when opening lid

I've got a Samsung Series 5 laptop running Windows 7 SP1 Home Premium, fully patched. It used to wake up from sleep by opening the lid, when I would put it to sleep by closing the lid. Unfortunately ...
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0answers
197 views

How to find out which program prevents monitor going to sleep on Windows XP?

On a machine running Windows XP I have the problem that the monitor often does not enter standby/sleep mode. I guess this is caused by some program that is running, because it reliably works if I ...
0
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1answer
349 views

HDD light blinking every second

some people asked about it already, but in my case it isn't a problem with the CD drive (it happens even when I take it out). I run procmon from SysInternals for a while and found out, that ...
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1answer
402 views

Debugging Windows 7 system that has lost ability to enter Sleep state on its own

I have read articles here and elsewhere looking for the root cause of this problem. The system is a Win7/32 desktop used as a media center. The application is SageTV. The system has been running and ...
2
votes
1answer
241 views

Is there an instrument or software that can measure the ACTUAL maximum power available to a USB port?

I use a non-self-powered USB modem device for a solutions I provide to multiple customers, and very often I encounter a problem in which the devices stops working due to many reasons, one of which I ...
0
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2answers
740 views

xfce power-manager->monitor difference between sleep/switch off

If I go to Settings-PowerManager->Monitor tab there are (among others) two sliders for management. 1. "Put Display to sleep when computer is inactive for:" 2. "Switch off display when computer is ...
6
votes
2answers
4k 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 ...
2
votes
1answer
1k views

Windows 7/ATI graphics: GPU fan speeds up when display goes into sleep mode

I am using Windows 7 Professional 64-bit with an ATI Radeon HD 4870 video card with latest drivers (Catalyst 12.4). In normal desktop Windows use, the fan of my video card powers down and is so quiet ...
4
votes
2answers
526 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 ...
0
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0answers
65 views

Windows System shutdown on always on

I need ideas as to why this Windows XP system shutdowns. I've edited all the power options to always on. Is there anything else that could maybe be overwriting that? No crashing. Just after x amount ...
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3answers
7k views

Cannot change power button or lid close action

I have a Samsung 900x laptop and I want to change it so that when I close the lid, nothing happens (I often close the lid to carry it somewhere 10 seconds away, and by putting it into suspend it ...
2
votes
1answer
7k views

How do I make ESXi 5.0 to shutdown virtual machines when the physical power button is pushed?

I have a home NAS/DLNA server built out of an HP Micro Server with the HP branded VMware ESXi 5.0.0 build-623860 (free license) installed. Being a home media center I'd like it to be "manageable" by ...
9
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2answers
634 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 ...