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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360 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 > ...
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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 ...
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0answers
523 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
209 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 ...
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1answer
363 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
446 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 ...
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1answer
284 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 ...
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2answers
858 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 ...
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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 ...
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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 ...
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2answers
568 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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0answers
66 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
8k 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 ...
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1answer
8k 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 ...
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2answers
721 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 ...
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1answer
151 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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1answer
730 views

Virtual PC - power consumption

I would like to know, how power consumption works. I have a windows 7 host and a ubuntu desktop guest. When running, does it consume power for both systems? Or just for windows? Does reducing virtual ...
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2answers
674 views

Underclocking/Power saver mode in Ubuntu 9.10

I'm using a laptop (Intel Pentium Dual T3400, 2GB RAM, Intel GL40 chipset), dual-booting with Windows Vista Home Premium and Ubuntu 9.10. Majority of the time, Windows is used. However, when I have to ...
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0answers
104 views

Linux and battery usage [closed]

I want to install a linux distro on my laptop but I do not want to have a massive battery drain. I remember reading some kernels drain the battery faster then others? Would Mint Linux or Ubuntu out of ...
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1answer
330 views

Quick and easy power management software for Win 7

Probably one of the most disappointing things for windows 7 is the power management. It's clunky, there's no quick option to kind of just go "do not sleep" or "sleep at this time" or "sleep in n ...
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0answers
1k views

Asus laptop not retaining Aero theme when unplugged

The problem i'm having occurs when i unplug my laptop, it disregards several elements of my theme. The taskbar gains "auto-hide". My desktop background is turned white. The transparency on my ...
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1answer
117 views

Why does waking a PC up with a timer act differently than with the power button?

I have a Windows 7 machine set up as a server. It has no monitor and is only accessed through remote desktop. I set up two scheduled tasks, one to put the computer to sleep at night and another to ...
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0answers
729 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 ...
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0answers
222 views

Dell C840 hangs on resume from standby

I have an older laptop - Dell Latitude C840 - with Windows XP Pro SP3. Everything works fine except for standby. It will go into standby but has great difficulty getting back out. On resume, sometimes ...
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0answers
279 views

Logoff user instead of shutting down when PC's shutdown button is pressed?

I know of the Sleep, Do Nothing and sometimes Hibernate options in control panel power management but is there a way to Logoff users when the power button is pressed on the physical machine instead of ...
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1answer
938 views

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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2answers
840 views

CPU performance fluctuates wildly

CPU: Intel Core 2 Duo P8400 @ 2.26GHz. I've had this laptop for about 3 years and in the past month I've started getting periodic framerate drops in games. Usually the pattern is random, something ...
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0answers
752 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, ...
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1answer
676 views

Difference between suspend to “mem” and pm-suspend

What is the difference between echo "mem" > /sys/power/state and pm-suspend Both can put the computer to sleep mode. I want to execute a script automatically when the system resumes from ...
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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 ...
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2answers
2k views

Reduce power consumption of gaming computer while idle

This is my current build: EVGA X58 (first generation) motherboard Intel i7 965 clocked @ 3.3 Ghz 3x DDR3-1600 Corsair RAM at stock timings and voltages Corsair AX750 80 Plus Gold PSU 1 ...
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1answer
928 views

Why am I having issues waking up my machine (and how to debug)?

Recently I switched from buying off the shelf machines to building at work (Building AMD FX-6100 or FX-8100, older ones are A8 series or Phenom II, with Windows 7 Pro). Without going in to the ...
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2answers
4k views

Windows 7 directly turn monitor off when just listening to music

Windows 7, Laptop DELL XPS 1330: When just listening to music, I want to turn off my laptop display immediately. It perfectly works after the usual delay (e.g. 10 mins) set in the power management, ...
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1answer
251 views

Is My PSU compatible with this UPS

I have this PSU and this UPS, however due to the PSU being/having an active PFC (power factor correction) it is incompatible with my UPS (at least according to APC tech support, for reference see my ...
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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 ...
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1answer
400 views

Turn off display on macbook 1,1 running ubuntu server 11.10

I am just getting started with my own server and thought I could put my old black macbook to some use. I installed Ubuntu server 11.10 as the only operating system and everything has been working out ...
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4answers
9k views

Does a UPS charge it's battery even if my computer is turned on?

I bought a new UPS and the manual says something like "the UPS must charge for 24 hours before it can work properly..." My question is, does it charge even if my computer is turned-on or should I ...
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1answer
2k views

How do I tell Windows 7 that I don't have a battery backup?

One of my computers recently started going to sleep at seemingly random intervals. Upon examining the system log, the reason is always the same. "The system is entering sleep. Sleep Reason: ...
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1answer
153 views

How can i see list of powered devices in my laptop?

I want to see all powered devices. I know about powertop. But that can't recognize device that isn't truly used. For example, my networkmanager is badly configured and wifi is powered on, i don't use ...
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1answer
561 views

Second HDD automatically stops after 30 seconds of inactivity

I have ASUS G53JW notebook with two HDDs (2x500GB Seagate ST95005620AS). Second HDD automatically stops after 30 seconds of inactivity. Always. I'm using Windows 7 x64. If I run a game from this HDD ...
4
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1answer
122 views

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?
3
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3answers
568 views

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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2answers
7k views

How do I get my disks to spin down after one hour?

I'm currently configuring a new home server, and I am trying to get the disks to spin down after one hour. But they do not spin down. Setup I have my entire system on an ssd: /dev/sda. I have three ...
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1answer
149 views

Downgrading gaming pc to NAS box

I currently have an old gaming pc which I wish to turn into a NAS box. Im aware and understand the way to install, im more interested in reducing power consumption. I thought if i removed the ...
2
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1answer
359 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
720 views

Is there anything to do with a dying li-ion battery when it's nearing its end of life?

Should I keep it in the fridge? Should I constantly discharge and recharge? Should I keep my hopes up or should I buy a new battery?
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4answers
4k views

Legacy Kernel Caller preventing sleep mode

I have a problem with Windows 7 not sleeping. PowerCfg -requests says a "Legacy Kernel Caller" driver prevents the sleep mode. This is not very helpful or informative. How do I get more details ...
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2answers
2k views

“Not Authorized” warnings with Slim desktop Manager on Debian

Recently I changed my desktop manager to use slim desktop manager and .xsessionrc to launch appropriate session. I’m attaching my .xsessionrc and slim.conf with this Now after using X directly without ...
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2answers
698 views

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 ...
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1answer
114 views

Where does Windows save things as the current system power state?

I'm currently wondering about the place that Windows (XP, Vista, 7) store information like "Windows is running" and so on. I mean, somehow Windows knows when you just power-down your computer that it ...