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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7answers
27k 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. ...
35
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6answers
89k 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.
1
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3answers
1k 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 ...
0
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3answers
2k views

Windows 7 Bug? Shuts down after 1st powerup after auto-hibernate due to critical battery level

I think I may have found a bug with Windows 7 (professional in my case) which deals with power management. In my power settings I have that Windows 7 will hibernate if my battery gets to a 'critical' ...
4
votes
2answers
795 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 ...
1
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1answer
2k 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 ...
0
votes
1answer
64 views

Stop Monitor Wake-Up Events Using KDE Plasma 5

I'm using Arch Linux with KDE Plasma 5 desktop environment. Unfortunately, I've been having this odd issue with my monitors waking up after going into screen energy saving. I haven't figured out all ...
2
votes
0answers
176 views

After Upgrading to Windows 10 Power Settings Ignored

I'm working with a couple of desktop units at work and for whatever reason one desktop unit now decides to ignore all Windows power settings after upgrading (then running a clean install) to Windows ...
1
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1answer
124 views

Can the power button of a PC or laptop be remapped?

Forget for a second how bad an idea this would be. But is it possible to remap the power button of a PC or laptop to, say, print some message or anything other than managing the power? If not, why? ...
7
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3answers
3k views

Is it possible to create individual power settings for each hard drive?

I have a number of different drives that I use for different purposes but I only use two of them frequently. I would like for the others to enter sleep mode when not in use, but never my main two. Is ...
0
votes
0answers
15 views

Laptop doesn't HYBRID SLEEP properly

My Windows 10 laptop is set to "hybrid sleep" upon power button press. When I press the button, sometimes it goes into sleep mode properly, and an orange LED starts blinking slowly (indicating ...
0
votes
1answer
34 views

Windows 7: After wake from sleep, Maximum CPU P-State always sets to 5%

Ok, I've been tracing an issue my box is having with Sleep (S3) and the maximum P-State set in the Active Power Plan after waking. After my machine wakes, the maximum P-State of the Active Power Plan ...
0
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0answers
435 views

Stay usb power on after shutdown on windows 10

I have MSI-P45 Diamond motherboard and Windows 10 64bit. I'd like to enable usb ports power after shutdown. If I turn off the PC from Windows they won't stay on but if I press power button after POST ...
1
vote
1answer
117 views

Disable laptop screen when lid is closed

I'm on a Lenovo Y50, running Windows 10. I have an external monitor attached (HDMI) and I use the laptop screen as well as the external. Sometimes I want to close the laptop lid and just use the one ...
1
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2answers
2k views

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 ...
0
votes
1answer
48 views

How To Disable Monitor Power Saving for All Users?

Question: In Linux is there a global configuration that is not KDE/Gnome dependent that will stop external monitors/displays from shutting off? Scenario We have a scenario where monitors / t.v.s, ...
1
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1answer
197 views

Unreliable resume from suspend?

My desktop PC (home-built) resumes from suspend somewhat unreliably. I'd say that it resumes successfully about 85-90% of the time and hangs with a blank screen 5-10% of the time. As far as I can ...
0
votes
1answer
291 views

Samsung monitor not going into power saving mode

I have recently bought a Samsung LT24D390 TV monitor, which I connected to my computer using a HDMI cable; the video card is a GeForce GTX 560 Ti, the O.S. is Windows 7 x64. The monitor works as ...
0
votes
1answer
17 views

Notebook's battery consumption based on OS

I use notebook to do typing, programming, browsing interne, downloading updates and so on. I use the same tasks on both Linux x64 and Windows 7 x64. My internet usage (browsing, downloading OS ...
0
votes
0answers
106 views

Prevent power plan from changing when plugging in / unplugging laptop

I have a custom power plan on my laptop and I Enable it by doing: Right Click battery icon > Power options > select 'My Custom Plan 1' > close the window Then I plug my laptop in, go back to Power ...
0
votes
0answers
65 views

How to select devices used for windows idle detection?

In my Windows 10 system I have connected a X52 Pro joystick. It seems to signal activity to Windows because the idle time counter never exceeds few miliseconds (tested with IdleClock ...
3
votes
2answers
15k views

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 ...
9
votes
5answers
10k 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 ...
2
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1answer
46 views

Close programs when on battery

Is there a Windows application or a script that kills programs when my laptop in not plugged in (and preferably relaunches them when charging)? I have a few background applications that use too many ...
1
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1answer
27 views

How do I enable turning off monitor in notebook with Windows?

I have Dell Inspiron 14r laptop which is dual-booting Windows 10 and Ubuntu 14.04. I noticed something: In Linux, when you lower the brightness to the minimum, your monitor turns off. But in ...
16
votes
2answers
11k 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, ...
0
votes
0answers
85 views

What is keeping my Windows 10 laptop from turning off the display?

I recently upgraded my laptop from Windows 8.1 to 10. Prior to the upgrade, and for a period of time following the upgrade, I had observed that the computer was operating correctly, according to the ...
1
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2answers
2k 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 ...
1
vote
0answers
334 views

Overriding “The speed of processor 0 in group 0 is being limited by system firmware”

My Thinkpad automatically locks the CPU frequency to ~1,5Ghz while the adapter is plugged in without a battery, as described in this article. I don't care whether the adapter can support it or not ...
3
votes
3answers
439 views

Laptop shuts down instead of going into sleep mode when I send it to sleep

I'm using an Asus laptop. It's more than a year old. This has been going on for maybe a month. I've looked into all the basic settings but can't find what's causing the problem. Here are the settings: ...
7
votes
4answers
15k 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
1answer
269 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 ...
1
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1answer
33 views

Power consumption of different computers

I have an old computer dedicated solely to running a lightweight web server running on Ubuntu. This is actually quite a powerful computer but I do most of my work off a newer computer. Recently, ...
3
votes
3answers
516 views

Loss of Power Management upon Standby Resume

I've got a Lenovo ThinkPad X220. Occasionally, when returning from sleep, the power management functions will cease to operate. I can't change the brightness of the display, the machine gets ...
0
votes
1answer
44 views

Laptop won't work if it is cold or uses too much power

I have a problem that my computer won't even boot if it's not hot enough or if my graphics card is not underclocked. I decided to check inside for visible broken components, clean dust, replace ...
4
votes
0answers
398 views

Screen Saver Won't Activate

I am using a Intel computer stick plugged directly into the HDMI on the TV. Running Windows 10. I'm unable to setup my computer to "auto-lock". In the power settings, I set it to turn the display off ...
0
votes
1answer
543 views

Unable to start computer with docking station button while connected to a docking station and laptop lid is closed, but when open, works fine

Basically I am placing a laptop on a docking station within a cart and placing the laptop inside the cart and closing the lid, then connecting an external monitor to the cart w/ keyboard and mouse ...
1
vote
0answers
450 views

Why is TeamViewer setting up a wake timer in the middle of the night and how to disable it?

After upgrading to Windows 10, my PC started waking up at the middle of the night. I have run all the routine checks and made sure that no hardware has the option enabled. However, upon running ...
8
votes
5answers
5k 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 ...
0
votes
2answers
51 views

ACPI, computer turning on sporadically

Lately I've noticed that my GNU/Linux Gentoo desktop computer turns itself on sporadically while it is suspended in ACPI S3 mode. I have made no changes nor updates to the BIOS. In dmesg I see the ...
3
votes
1answer
121 views

High Sleep Power Consumption in Yosemite

Over the last week, my OS X Yosemite (rMBP 2015) has been consuming large amounts of power in sleep mode (~20% over 12 hours). I am not aware of any particular thing I might have done to make this ...
7
votes
2answers
9k 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: ...
7
votes
3answers
4k 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)?
0
votes
0answers
25 views

second Hdd on optical bay and power consuption

I have a new Lenovo W541, and while the first week the fully charged battery was saying 4 hours left", after I added 1T HDD on the optical bay (DVD slot) now it says 2 hours left. I read around that ...
0
votes
0answers
225 views

Delay sleep/login page when closing laptop lid on Windows 10?

I want to be able to close my laptop lid, but not have the laptop got to sleep for a set amount of time (e.g. 5 minutes). If I open the laptop in that time, it bring be back to where I was without a ...
3
votes
3answers
10k 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
votes
0answers
55 views

Computer shuts down when trying to wake up after going a sleep for a while

I've got a windows 8.1 computer that goes to sleep and wakes up fine in the space of about 30 mins, but if you try and wake it up after that, it shuts down. I think I've tried ever combination in ...
0
votes
0answers
115 views

Sleep after and Hibernate after in Power Options

In Power Options, when you change a plan's settings, you have the options to change the Sleep after time and Hibernate after time: I have a couple of questions regarding the different scenarios for ...
11
votes
1answer
22k 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 ...
0
votes
1answer
64 views

How to easily toggle to and from High Performance power mode in Windows 8

Windows 7 and 8 have three default "power modes", regarding how much the prioritise speed vs conserving energy: "Power saver", "Balanced", and "High Performance". On a portable machine with a battery ...