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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Sleep, hibernate additional condition in Windows

Is there a way to set an condition to not sleep/hibernate on Windows based systems if the particular app/process is running?
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2answers
84 views

What's this number under “power capabilities” in “power data” for a device?

I would like to understand what the number 00000009 means in the picture. I mean, I understand that the things under it can say all kind of thins about power capabilities, and I've even been able to ...
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512 views

Query current power config settings on Windows 7

Powercfg gives the ability to set certain settings like monitor-timeout-ac and standby-timeout-dc using powercfg -change <setting> <value>. Is it possible to query the current values of ...
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3answers
198 views

Windows 7 screen saver

We have a range of public Windows 7 computers. The computers are always on. When the users are logged on, the screen must not go off and the computer must not sleep. However, when the user ...
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209 views

Avoiding sleep when lid is close and no one is logged in

I've an old Dell Latitude laptop that I've converted to CentOS 6.5. As this is going to work like a server (i.e. no one will use it directly) I've changed from UI the power management option to ignore ...
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1answer
48 views

After a while the computer enters hybernate, how to disable?

If I manually set the computer to sleep or just leave it alone, by the morning it appears to be switched off, in hybernate mode. This is very annoying because the computer is notebook and I have to ...
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35 views

minimum allowable CPU speed

How can I determine the minimum allowable speed for my CPU to run the computer. Having the option to reduce the CPU to 0 is not logic nor allowable in Win8. Even if you set the Max. processor ...
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0answers
18 views

Display issue after enabling Super Energy Saver?

This is going to sound incredibly stupid to computer buffs, I'm sure. But: My battery was dying. I enabled Super Energy Saver in the Power Options. The screen went black, and then the resolution ...
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1answer
646 views

Laptop keeps waking up from sleep (Windows 7)

Laptop is fully charged before I put it to sleep and when I come back more than 12 hours later and resume it, the computer only has around 10% left. I have used the powercfg lastwake and powercfg ...
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1answer
253 views

How can I monitor CPU frequency on Linux servers?

At low CPU frequency, latencies can be higher or we may come to some wrong conclusions related to server capacity. Knowing the CPU frequency is important for high performance scenarios. In case of ...
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1answer
459 views

Force a program to consume at most x% of CPU time [duplicate]

Is there a way to force a specific program to use less than 100% processor time even when the CPU would be idle otherwise? Using process priority, we can adjust how much resources a given program ...
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1answer
817 views

Linux Mint 16 on HP Pavilion dv6 laptop - power management doesn't work

I installed Linux Mint 16 on my HP Pavilion dv6 laptop. On Linux, my laptop always seems to be under load (fan spins at full speed etc.) Is there any power management tool / driver that could help ...
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428 views

are APM levels (hdparm -B) and spin-down time (hdparm -S) different?

The man page referenced in this answer indicates that hdparm -S sets the spin-down time, while -B sets the APM level, and also suggests that -B is a hardware thing (implying -S is software?) However, ...
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2answers
179 views

How to wake a sleeping laptop

I have an old compaq pressario CQ61 that's getting a bit old and I'm trying to convert to a media server. I want to put it by the TV and leave it mostly alone, and manage remotely (via RealVNC). Now ...
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88 views

win 8.1 can't sleep automatically after hibernating

There have been many post online about win 8.1 not entering sleep mode, my problem however only happens after I wake the device from hibernation (data saved to memory, power off). laptop: Asus eee PC ...
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2answers
5k views

How to disable Connected Standby in Windows 8?

I have a tablet that runs Windows 8 Pro. Microsoft came up with a new power mode that they call Connected Standby, in which evidently all non-Metro apps are suspended when the tablet is put in a lower ...
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193 views

HP 2000-bf69WM doesn't wake from sleep after downgrading to Windows 7

I have an HP 2000-bf69WM laptop that originally shipped with Windows 8. I have since downgraded it to Windows 7 Ultimate x64 SP1. I have installed all the drivers from HP's website for the laptop, ...
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1answer
81 views

Why is my computer constantly resuming from sleep?

My recently reformatted Windows 8.1 machine keeps resuming from sleep. This is an acute issue ever since I got my SSD (the reason for the reformat), as Hybrid Sleep is out and the system does true ...
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89 views

Games hang in “Balanced Power” mode

My PC specs: AMD FX-8320 @ 3.7 GHz (stock cooler), 8GB 1866 MHz RAM, XFX R9 280X (OC'd @ 1.25v), ASUS M5A97 R2.0, Corsair TX750. While playing games like Dead Space 3 and BF4 and other ...
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139 views

Sleep hard disk after X minutes of idle

I want to make two drives sleep after 15 minutes of idle (sdb and sdc) on Linux Arch. I have the idea that hdparm should be able to help me. I can put the disks into standby (hard disk spins down, ...
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1answer
33 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 much ...
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2answers
2k views

Change Behavior of Linux Power Button

I have a headless linux mint machine that I use for a file server and other things. It's been working great for me for a few years, but there's one issue - my cat likes to hang out on top of it, and ...
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72 views

Disable 2 cores to meet 95w TDP

I have a Phenom II X4 965 BE CPU on a M5A78L-M LX/BR motherboard. The motherboard supports processors of maximum 95W TDP. The CPU is 125W TDP. So I disabled 2 cores of the CPU trying to avoid the ...
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1answer
622 views

OpenSuse 12.3 gpu fan speed

I won't go into the details of what I tried and simply explain what I want. graphics card: AMD HD 4870 So I'm usually working with Windows 7 and my gpu is at 54C with 30% fan speed when idle. Now I ...
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1answer
92 views

How to know which /proc file is used to set the backlight?

How to know which /proc file is used to set the backlight ? $ ls -1F /proc/acpi/ returns : ac_adapter/ battery/ button/ event wakeup xbacklight works. I use awesomeWM with Ubuntu 12.04, on a dell ...
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1answer
2k views

Something's turning off my hard drive

I have an Acer Aspire V3-771G laptop With Intel chipset and NVidia 650M Graphics, running Windows 8.1 pro. The laptop has 2 hard drive slots. A few weeks ago I installed an SSD in my laptop. I ...
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1answer
349 views

HDD randomly turns off and then on

I have problem with my SATA HDD - it shutdowns itself from ocassionally, and then almost immediately turns back on again. It's system drive and the only one in my PC. I've disabled turning hdd off in ...
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1answer
153 views

Why is my monitor turning off after inactivity when power settings tell it not to?

I'm running Windows 8.1 Pro and a Radeon HD 6670 with the latest ATI drivers. I've noticed lately (maybe within the past month or two) that my HDMI out will turn off after not being at the computer ...
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2answers
103 views

Win8 on laptop: lid turns off only the monitor

I have an Asus S400CA with Win8. When I'm home I access it with VNC. I'm trying to config its power settings so that, when it's plugged on AC, when I lid close it, only monitor is turned off and ...
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0answers
1k views

Wake-on-LAN stops working after a few hours

I have a Linux server (Ubuntu 12.04.03) which serves as the internet gateway for our LAN of about 15 PCs. That is, eth0 on the Linux server is the Internet, and eth1 plugs into an unmanaged switch (a ...
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62 views

Why deleting a file in windows re-spin / wake up / power up all the hard drives?

If I delete a file on HD 1, and HD 2 is sleeping (power down), windows spins it up for some reason. I'm using the regular recyle bin. Turning off the recycle bin for all partitions on HD 2 won't help ...
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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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1answer
93 views

Laptop will not power from battery

I have an Acer Aspire 7551G that will not power from battery, the AC adapter must be connected for the machine to boot and as soon as the adapter is removed the laptop instantly dies. The contacts ...
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1answer
664 views

Wake-on-lan from S5 and prevent network card from turning off

I'm tired googling and looking through hundreds of forums, please help. OS: Windows 7 64-bit Motherboard: ASUS M4A77T/USB3 Onboard network card: Realtek® 8112L The problem is that network card keeps ...
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1answer
49 views

Is an event registered when a monitor comes out of Power Saving Mode?

I am using task scheduler to fire a program when someone logs in, unlocks the station, and I would like to do it when the screen turns back on prior to locking. IE the power savings turns off the ...
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1answer
1k views

Disabling AppNap for Terminal

How do I disable AppNap for Terminal? Get Info on Terminal does not have Prevent App Nap check box An alternative is to turn the NSAppSleepDisabled flag on, but will it actually work? $ defaults ...
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2answers
385 views

Windows won't sleep

My Windows 8.1 PC suddenly decided it no longer wants to go to sleep. If I explicitly put it to sleep then it stays in sleep mode, but it doesn't obey the power plan setting to go to sleep after 30 ...
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1answer
774 views

turning display off while playing video file in vlc player

Does there is any option or settings (native to vlc player or windows) to automatically turn off the display when playing a video in it.. Could be handy when want to listen only to audio and making ...
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83 views

Closing the lid of my notebook doesn't have any effect

When I close the lid on my Samsung 900x3c-A01 nothing happens, both on Windows and Linux... I've made double-sure all the OS' settings are correct, I even tried to set them up so they would shut down ...
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122 views

Reducing CPU load to absolute minimum

I have had a couple of things gone missing I believe stolen in my shared apartment and want to run my laptop constantly with a webcam attached, running webcam surveillance software to record/ take ...
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2answers
476 views

How to limit my CPU power programmatically on Windows 7?

Whenever I run a CPU-heavy activity (like compressing a big set of files into an archive for example) my CPU switches to its full throttle (maximum frequency) and shuts down of overheat in less than a ...
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1answer
1k 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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77 views

Disable screen power save mode when external monitor connected

I have a laptop with a HDMI connector (NVidia gfx), is it possible to stop the screen from going into power save mode only when I have something connected to the HDMI connector?
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1answer
70 views

How effective is to blacklist GPU to avoid power consumption? [closed]

I blacklisted my NVIDIA graphic card by putting it in /etc/modprobe.d/blacklist.conf, I would like to know how it reduces my power consumption
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2answers
333 views

On windows, how to force application close upon going to sleep

Is there a scripting possibility or application, free or commercially avaible, that would allow me to set up windows to close a partuicular application before it goes to sleep mode?
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2answers
2k views

Underclocking Haswell for power saving

I have been reading up on Intel's new Haswell processors, and it seems that the K-series is designed for overclocking. But what if I want to underclock? Do I still need to buy a K-series processor? ...
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1answer
906 views

powercfg.exe not working properly

os:Windows 8 pro x64 build 9200 (fully updated) I want to change the closing lid function through command line with powercfg.exe, so I gathered the required GUIDs and executed the following command: ...
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1answer
40 views

manage hardware power supply

How can I manage power supply? (if it's possible of course). Since my charger doesn't supply the needed energy, I need to reduce/remove power from some devices in order to let my processor run full ...
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1answer
4k views

What could be causing windows to fail to sleep or hibernate, and revert system settings?

I am running Windows 8.1 on my system (Dell e6520) and the symptoms are this: My PC won't sleep or hibernate. It the screen turns off, but the fans just run and run, and after a little while, it ...
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1answer
645 views

extract power plans from saved registry

I need to restore Windows 7 power plans. I saved full registry on an old PC (also Windows 7), that PC is not available any more. How can I extract power plans from the saved registry?