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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What is preventing my computer from going idle?

When I first boot my Windows 7 computer, it will go idle if I stop using it - first the screensaver comes on, then the computer goes to sleep after a certain amount of time. This is the expected ...
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19 views

Loss of memory when system is mistakingly inactive

I have an application (FEM-Simulation) which runs about 24 hours and takes about 60%-70% of my memory. When I keep working or surfing during the simulation, it runs without any problems. But when I ...
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2answers
6k views

What Is AVR Mode In UPS Software Management?

When UPS was disconnected from power source and 25W desk lamp was connected to it, all was normal: But as soon as i have unplugged it and plugged in 95W fan, AVR "Normal" changed to up arrow: ...
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2answers
13k views

How many watts do case fans generally use?

I'm deciding between a 500 watt PSU and a 600 watt PSU. I currently have a 460 watt PSU that powers everything but my dvd drive, spare hard drive, and 2 fans. I've determined 40 watts is enough to ...
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1answer
678 views

Laptop Power saving when in standby

After my laptop goes into standby is there any way to put it into hibernate when the battery reaches a critical level?
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4answers
648 views

How do I set my power plan to turn off the display in less than 1 minute?

The lowest setting in a Windows power plan under "Turn off the display" is "one minute". How do I set it for 30 seconds, 15 seconds, et cetera? I found that the shortest idle duration time you can ...
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20 views

Windows Vista computer won't power on when connected to router

In all of my years of supporting PCs, I have never seen this. Here's hoping y'all have an idea. My client has a home PC running Windows Vista (long story as to why he hasn't upgraded). He has a ...
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1answer
268 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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3answers
1k views

how to make LXDE hibernate the computer when the power button is being pressed

How to setup LXDE (a linux desktop environment) to hibernate a PC after the power button on the computer is pressed?
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1answer
70 views

which parts i can remove from server to reduce power coonsumption

I have a 4u IBM server for home use and it consumes 480w. It has 4 X Quadcore CPU and 128GB RAM & CD Drive I want to reduce the power consumption so i want to know that if i remove 2 x Xeon ...
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0answers
11 views

Idle state in RTOS, sleep state or lowest frequency?

In real time systems using an RTOS, what how would the RTOS handle an idle period? Would it run nop instructions at the lowest frequency supported by a Dynamic Voltage Scaling capable processor? or ...
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0answers
122 views

Windows CPU max/min %age settings not being adhered to

Interesting. I have a Windows 8.1 laptop with and an Intel Core(TM) i7-3630QM CPU @ 2.40GHz with 4 cores and 8 virtual processors. I have various power profiles in Windows: 1. Power Saver, 2. ...
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2answers
1k 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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4answers
929 views

CPU is underclocked on battery (balanced plan)

I have a pretty bad amd e300 cpu. Whenever I am on battery and on balanced plan, cpu-z reports my frequency to be 798 mhz (in all conditions (full load etc)). However, in the processor power ...
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0answers
53 views

Turn on computer with wireless keyboard

I have a PC connected to my TV that I like to use from the sofa. I have a wireless keyboard (Logitech K400, this one) for the purpose. I would like to be able to turn the PC on (as opposite to just ...
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2answers
1k views

Execute a command if Linux is idle for 5 minutes

I would like to execute a command such as notify-send 'a' if my Linux machine has been idle for 5 minutes. By idle, I mean the same thing a screen saver that gets activated would use to define ...
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2answers
329 views

How can I get my Windows 8 PC monitor to power off like a phone?

Here is what I would like to happen (and what I mean by "like a phone"): I use my PC I stop input to the PC (therefore "idle") Some time passes (say 3 minutes) There is an indicator that the monitor ...
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1answer
498 views

How can I set the idle timer for a disk connected to a 3ware RAID controller?

I have Linux server with a 3ware 9550SX SATA RAID controller with several disks attached. One of them is a 2TB disk that I'm using for backups. It's a normal desktop disk (i.e. not for 24/7) and I ...
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1answer
610 views

utility to troubleshoot PC not going idle

I have Windows 7 x64 installed and sometimes it will not go into an idle state allowing for the monitor to turn off. I keep shutting down services and programs, but I can't pinpoint what is causing ...
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0answers
8 views

How to perform certain tasks when switching from/to Power Saver mode in Windows 8? (Disable services etc)

How can I disable certain services and terminate certain programs automaticly when I let my laptop go into power saver? And then automaticly restore them when I go to "performance" mode again? If ...
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3answers
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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4answers
317 views

Is it possible to change computer's power plan via Remote Desktop Connection?

I want to change my laptop's power plan via Remote Desktop Connection, but the option is greyed. I am logged with the admin account and both PC's are running Windows 7. What could be the problem?
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25 views

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
49 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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1answer
155 views

Set password for certain events on Windows 7

Is it possible to configure Windows to ask me for the password after specific events? Like, only prompting for my password after Hibernation or Shut Down, but never after Restart or Suspend?
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1answer
152 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 ...
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3answers
134 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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2answers
281 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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2answers
222 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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0answers
150 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
40 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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4k 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, and restart right after that. No blue screen, no hanging ...
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29 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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17 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
359 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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2answers
958 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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3answers
5k views

Laptop fan always on with AC, not always on with battery, despite being configured

My laptop occasionally gets somewhat hot, so I've configured my power plan in Windows 7 so that the fan should always be on whether powered by AC or battery. However the fans don't always run when ...
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1answer
133 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
186 views

Can I prevent my power saving from activating when XBMC is running but doesn't have focus?

This seems contrary to what most people want, but I've got a somewhat different setup. I have my desktop computer hooked up to my HDTV as a second screen - I don't always have it turned on in that ...
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1answer
677 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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2answers
258 views

Is it safe to add or remove any type of device while in sleep mode?

Is it safe to add (plug in) or remove (unplug) any device while Windows is in sleep (a.k.a. standby, a.k.a. suspend) mode? What type of devices can be added or removed in this manner? Can you do this ...
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329 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
132 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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71 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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1answer
2k views

Frequency Scaling Monitor for Windows

What program is there to monitor the current CPU frequency (not the nominal CPU speed) on a Windows 7 system, similar to the Frequency Scaling Monitor applet in GNOME?
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140 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
65 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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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
380 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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2answers
2k views

Notebook Shuts Down when i close the lid

Recently i bought this notebook. After i install Windows i made my default power settings. As in my settings, it should sleep in all conditions; Power button, sleep button, Closing lid. However the ...