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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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
3k views

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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1answer
20 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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0answers
17 views

Missing pieces on UPS model Hantol HU1000 [on hold]

My UPS (for PC) is not working, so when I opened it I noticed several MOSFETs (I think) are missing (looks like its the part that converts DC to AC). Is there any schematic to replace them, because I ...
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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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0answers
24 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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3answers
41k views

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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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
44 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
6k views

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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2answers
49 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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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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7answers
16k 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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4answers
3k views

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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0answers
30 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
29 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 ...
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0answers
26 views

Cannot Wake Laptop From Sleep

I just got a laptop with Windows 8.0 Pro 64 bit. I know this is common problem but I cannot get this solved. When the laptop goes to sleep, it cannot be woken up. I have tried to search google and ...
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1answer
8 views

Xscreensaver causing my monitors to turn off and on repeatedly when its power management features are active; how to fix?

Something weird is up with my Xscreensaver 5.15 configuration on Debian Wheezy. I have two Dell U2412M monitors hooked up to a single graphics card (one over native DVI and one over HDMI output to DVI ...
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1answer
2k 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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1answer
508 views

Screen brightness maxes out automatically when watching videos or playing games

The screen brightness maxes out automatically each time I am wath videos or playing games on my laptop (a Packard Bell EasyNote TSX66HR). What i have done recently: I bought new Samsung Evo SSD ...
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2answers
73 views

Default Power Plan options apart from Balanced have disappeared, how to restore them?

On Windows 8.1 on a Microsoft Surface, normally I have Balanced, Power saver, and maybe High Performance. Today I only have Balanced ... where could the others have gone? When I go to Control ...
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44 views

xfce4-power-manager does not Off Fan in Debian 8

I have recently installed Debian 8 for amd64 in my laptop. Laptop is dell vostro. I also install LXDE environment. As manage power I installed xfce4-power-manager (because this recommend for lxde). ...
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2answers
189 views

Windows Power Plan automation

I like to keep my Asus ROG G750JZ(laptop) on all the time and I have already automated sleeping at 01:00 in the morning, auto wake-up on opening the lid. However since I am not using the laptop all ...
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1answer
17 views

Automatic power on my server

I have a problem with electricity in my company (common cuts) how can I make my server (DELL POWEREDGE 2900) starts automatically when the electricity is restored and I'm not there
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5answers
28k views

Secondary monitor shuts off when laptop lid close

I have a new dell XPS laptop. My external Dell monitor attached to my laptop.Everything works fine if my laptop lid is open, but if I close the laptop lid, I lose the display on the monitor attached ...
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1answer
44 views

External hard drive spinning down too early

I have a Mac Mini 2007 running Ubuntu Server 14.04 LTS with an external Hitachi Touro Mobile 3.0 attached. APM is 127 (hdparm -B127) with standby value of 1 hour (hdparm -B242). But the disk is ...
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0answers
48 views

Power configuration for docked - undocked laptop

I have a problem with my power configuration for my laptop. I have a laptop (Dell E-6530) which I use for work at home and at office. At office I also have a docking station (Dell E-Port Plus II) with ...
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2answers
461 views

How to find out what's causing a laptop to take too long to go to sleep?

Until recently my laptop took at most around 5 seconds to go to sleep when the lid is closed. This was the case for several months. Recently however, my laptop takes around 2 minutes (maybe more) to ...
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2answers
37 views

Will external screens dim as part of power management?

Most, if not all, Windows laptop computers will dim their screens after a configurable time duration. After an additional time duration, the screen will turn off completely. These settings are ...
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0answers
26 views

Fixing hibernation on Windows 8

My Windows 8 will not hibernate anymore. I ran sfc /scannow, found some issues, ran DISM /Online /Cleanup-Image /RestoreHealth, and again sfc /scannow, and all is good. I've disabled and enabled ...
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2answers
8k views

Enable Lenovo's “conservation mode” on boot

I have a Lenovo Z50 laptop with Lenovo's Energy Manager installed. Inside the manager's settings menu is an option to enable "conservation mode", which keeps the battery charged in the 40-65% range ...
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85 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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1answer
45 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? ...
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0answers
61 views

All USB devices randomly stop working under Windows 8.1

As the title says, this problem (USB devices stop working) happens completely randomly – once a day, 5 times a day, or sometimes not at all. I have searched the event viewer after restarting every ...
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0answers
22 views

Laptop shuts down by closing the lid when plugged, not goes to sleep as it should

I have installed Debian 8.0 Jessie with Gnome on my HP ProBook 430 G2. The weird problem is that when I close the lid while laptop is plugged, it shuts down and does not go to sleep as it does when ...
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1answer
26 views

How can I change the description of a power plan in Windows 8?

I used the powercfg utility within windows to duplicate a power plan that my Samsung SSD software created and I would like to change the description of the new plan.
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4answers
16k 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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0answers
61 views

USB device loses power after 20 seconds Windows 8.1

Alright so I recently started using a Tritton Primer Headset, it worked fine for a day but since then the USB powered baseplate receives power for around 20 seconds then it drops to 0ma. After 20 ...
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1answer
56 views

PC restarts on power outtage despite having a UPS

Unfortunately where I live I do not have 24/7 electricity. My new PC rig which is considered to be a high-end(gaming) system is connected to a brand new APS/UPS that have these specs: DC-AC ...
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1answer
30 views

How can I make windows reset the power plan to a chosen one after each restart?

After I start my pc every morning I don't want to check what power plan I am using and comfortably start my favorite game without worrying about whether I left a power saving power plan on. It could ...
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1answer
717 views

All USB devices go to sleep in idle mode on Windows 7

A strange thing happened after a few updates to the system: Intel rapid storage SSD firmware update Intel Ethernet adapter update GPU Intel update When the computer turns off the screen (after ...
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6answers
17k views

How to disable power to USB ports when laptop is in sleep mode

I have a Windows7 laptop with two external 2.5" HDDs and a cooling pad connected through USB ports. When I put the laptop to sleep, these devices are still powered on - the fan in the cooling pad is ...
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1answer
26 views

How to prevent hibernation during work hours

I have a laptop at work that I don't want it to hibernate during work hours. It may be running a program that will corrupt the current data if it hibernates. After work, it can hibernate until someone ...
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1answer
101 views

Display won't turn off, Turns black Instead Lenovo ThinkPad W540

In my power setting, my display should turn off after a minute, when this amount of time elapses, the display is still on but showing black screen instead of turning off. How Can I solve this? ...
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2answers
90 views

Can't set Qualcomm Atheros AR9485 card power on laptop under Linux

I've been trying to set the power management on my wireless card. I looked at PowerTOP and I tried setting power management on the wireless card, but it doesn't work. When I tried using the command ...
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1answer
138 views

Linux Mint: Power Management does not turn off displayport monitor

I have two monitors connected to this system... one via displayport and one via DVI. When I go into the screen saver settings, I enabled Power Management and set standby, suspend, and off to 1 minute. ...
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1answer
519 views

Transcend MTS400 SSD crashes my Acer C720 Chromebook, how to disable SATA power management in Chrome OS?

So I upgraded my Acer C720P Chromebook with a larger Transcend MTS400 SSD. However this SSD has a firmware bug, because of which it is incompatible with SATA power management (ALPM). This Transcend ...
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2answers
340 views

Does speedstep and cstate affect user experience?

I have desktop running Windows 7 on Intel i5-750. After taking a look at the bios option I saw the SpeedStep and C-state were disabled. My question is - do they have any negative effects on the user ...
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0answers
73 views

Harddrive spinning down though time increased with hdparm

I have an external harddrive connected via USB. The usual method to set the spindown / standby time of harddrives seems to be using hdparm. So I run sudo hdparm -S 200 /dev/sdb and get /dev/sdb: ...
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0answers
37 views

How do I prevent an Asus Q301LA laptop from shutting down when I am actually selecting sleep?

I purchased an Asus Q301LA laptop about 9 months ago. It ran Windows 8.1 from the beginning, and worked flawlessly. But about a week ago it began having sleep issues. Whenever I try to put it into ...