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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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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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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175 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 ...
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3answers
776 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 ...
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3answers
135 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: ...
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1answer
3k views

Ubuntu 13.10 has no Suspend or Hibernate Options

I have a Lenova Yoga 2 Pro, and I have Ubuntu 13.10 installed. I am having some issues setting the power functions. At the moment I can not suspend or hibernate the laptop. So from Gnome 3.10 I have ...
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4answers
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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, ...
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1answer
98 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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1answer
17 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, ...
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3answers
513 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 ...
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1answer
45 views

Power mode change randomly on Windows 10

My question : Sometimes, randomly, whether i'm on battery or not , the power mode always switch to performance mode even if i'm on saving battery mode. Plus, on this moment, the start menu pops out, ...
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2answers
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Can a faulty battery cause my laptop to shutdown even on AC line? (battery installed AND plugged in together)

Until recently, I experience something rather annoying (and troublesome) with my laptop. It spontaneously shuts down itself without any warning, it restarts. No blue screen, no hanging program, just ...
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35 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 ...
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0answers
29 views

Windows laptop waking on touchpad click

I have a laptop that keeps waking from sleep. My cat sits on the laptop when it is closed and the screen bends which clicks the touchpad button. I can't turn off the wake setting on my touchpad in ...
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0answers
106 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 ...
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4answers
366 views

Easy way to switch power plan in Windows 10

I've a 27" external monitor connected to my laptop and I use my laptop's screen as secondary. I've both screens turned on while I'm working. When I'm watching movies, I just keep my external monitor ...
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1answer
250 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 ...
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20 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 ...
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207 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 ...
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69 views

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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3answers
3k views

Close lid to sleep just about and open lid to wake up asap without requiring password if done soon enough

I am sure at some point this tablet-like laptop was doing the thing I've briefly described in the title. That is, within the first couple of months that I've started using this thing. I am using a ...
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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 ...
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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 ...
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86 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 ...
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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: ...
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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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19 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 ...
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142 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 ...
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3answers
7k 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 ...
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36 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 ...
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47 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 ...
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1answer
16k 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 ...
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21 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 ...
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29 views

Dell Dimension E521 not waking up from sleep or hibernate

I have been having some unusual power management problems on my Dell Dimension E521. When the computer goes to suspend mode automatically, it suspends properly, but when I turn it on, all I get is a ...
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4answers
17k views

Docking station power adapter is not recognized by my Dell notebook

At this morning, my laptop (Dell Latitude e6410) gave me this error. I didn't do anything, I didn't change anything. And I got this docking station just 2 month ago. I made a little research on the ...
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2answers
91 views

Laptop waking up from sleep because of “power button”? (Windows 8.1)

My computer is brand new but has a serious problem - it wakes up from sleep mode on its own in the middle of the night, usually a couple hours after I put it into sleep mode. This problem is ...
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1answer
6k 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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3answers
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How do you check how much power a USB port can deliver?

Some laptops have a special USB port that can deliver more power than the other ones. However it is not always easy to identify which one is the good one, nor how much power it can deliver. So is ...
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7answers
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How to turn off the display in Windows 8 without locking or making computer go to sleep?

How to turn of the display in Windows 8 without locking or making computer go to sleep ? The problem is that when I enable ‘Turn off display after x minutes’ feature from control panel, the device ...
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7answers
17k views

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 ...
2
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2answers
111 views

Set brightness to zero in Windows (like in Ubuntu) [duplicate]

I have a dual boot Lenovo W520 system, with Windows 7 and Ubuntu 14.04. In Ubuntu, when I set the brightness to the lowest value, the backlight actually turns off, which is a brilliant battery saver. ...
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61 views

Energy manager conservation mode is not working properly

I have a Lenovo Z510 with its official energy manager installed on it. Most of the times my laptop is plugged in and I've turned on conservation mode in energy manager in order to increase the life of ...
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2answers
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Is there a way to execute a program on power events?

I'm basically looking for a way to execute an application when my laptop transitions to battery power and, similarly, when it returns to AC. Is there a built-in hook in Windows or a third-party ...
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6answers
4k views

How can I prevent my wireless mouse from waking my Windows 7 computer?

My mouse is so sensitive that it randomly wakes my computer up even when I don't touch the mouse. I don't want this to happen, so I want to disable the mouse's ability to wake the computer. I know ...
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1answer
74 views

Windows 8.1 Laptop; Is there a way for closed lid to cause sleep but not when there is a monitor hooked up?

Is it possible to make a laptop sleep when the lid is closed UNLESS there is an external monitor that is plugged in? Perhaps a registry hack or third party software? The control panel power settings ...
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2answers
72 views

How can I stop my laptop from automatic waking up?

My laptop wakes up automatically exactly 12 hours after it was put into a sleep mode. It has this behavior from the beginning, it is very annoying, especially then the lid is closed and it wakes up ...
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7answers
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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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4answers
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Powering down the display in XP with a command

Is there a command to power down the display in Windows XP? That is, a command that causes the video card to stop sending a signal to the monitor until input is received, much as power management does ...
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83 views

Battery stops charging at 60% after installing Ubuntu

I had Windows 7 installed on my Dell laptop. The battery was working correctly and charging to 100%. When I installed Ubuntu I noticed that battery is charging to 60% only. I thought it was just a ...
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0answers
72 views

ASUS Z87-PRO cannot power-on via USB from S5

I have the ASUS Z87-PRO connected to a Seasonic S12 II Bronze power supply. All USB ports are powered while the device is powered-off - S5 (by having the "ErP ready" option in BIOS disabled). I ...