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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336 views

Computer hibernates when I tell it to sleep

Problem When I tell my computer to sleep, it hibernates instead of sleeping. This occurs regardless of whether I tell it to sleep using the button on my keyboard or using the UI. Interestingly, when ...
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1answer
6k 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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0answers
57 views

How to turn off a particular hard disk in a multiple disk computer system to save power? [duplicate]

Explanation: I have about 5 hard disks in my windows 7/8 machine. Since, the operating system is only installed in 1 disk, the rest 4 drives just consume power staying connected to the motherboard. ...
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1answer
60 views

What are the impact on underpowering my motherboard/graphic card?

I recently had to change my PSU and the one that was given to me has not enough power cables to fully plug every plug in the motherboard and the graphic card. It seems to work just fine though, and ...
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1answer
12 views

Why do desktop OSes have a high response time when resumed from sleep/hibernation mode?

Why do desktop OSes such as Windows have a high response time when resumed from sleep or hibernation mode? Intuitively, it should take less time to respond. But what is messed up internally that ...
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2answers
47 views

What exactly do power plans do in Windows 7?

What do power plans do on a desktop PC? My computer has Balanced, AMD Power Plan, Power saver and High performance. When going to change settings, the only things to change are the display timeout and ...
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0answers
47 views

How can I get the power consumption of a laptop in miliwatts? [closed]

I've seen programs which are able to retrieve the power consumption of a laptop in milliwatts, like BatteryInfoView (for Windows). I'm looking for something similar but more powerful, i don't care if ...
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0answers
46 views

USB device only works through a hub

This one kind of boggles my mind. I have an audio interface (Steinberg UR-22), which was working until this morning. I've tried plugging it into every usb port on my laptop while removing all other ...
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3answers
2k 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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0answers
963 views

USB Suspend: USB Device not Entering Selective Suspend

After running powercfg energy command I get the following efficiency diagnostics report with 6 Errors: USB Suspend:USB Device not Entering Selective Suspend This device did not enter the USB ...
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1answer
33 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 ...
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1answer
1k views

Power plan keeps getting changed to 'turn off after 20 minutes'

In Windows 7, I go into the Control Panel and select the Always On power plan - it should never turn off the display or put the computer to sleep, but it keeps reverting to turning off the display ...
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1answer
136 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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2answers
59 views

Power Management: Have Win 7 box turn on and off at a scheduled time

I sometimes need to run a batch job on my Win 7 Pro workstation at a fixed time. I use the scheduler to make sure the task runs then. But, I need to disable sleep beforehand, which wastes lots of ...
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1answer
236 views

Can I prevent my Windows laptop from waking up when the lid opens?

My laptop (a Lenovo Thinkpad W530 running Windows 7) regularly wakes from a sleep state in my bag, draining battery and overheating badly (even when I make a point to leave the fans unobstructed by ...
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1answer
238 views

Battery Meter in Windows 8.1 keeps showing “Balanced” a the top

I often use High Performance and Power Saver, but the "Balanced" power plan keeps staying at the top and I can't rearrange. How I can change what plans should be shown so I don't have to go to Power ...
2
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1answer
47 views

Is it possible for a device to remember settings after turning the pc off?

I once had a problem with a sound card in my computer. After installing drivers under windows and setting the card, I had to mute it. Then I turned my pc off and loaded a linux OS from another disk. ...
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0answers
87 views

Terminate/Kill a process before entering Standby

We have a MSAccess based solution that is running on customers computers and is lauchend through a VBScript-script. Due to the network enviroment here, we KNOW that in most of the cases the ...
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1answer
187 views

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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0answers
23 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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0answers
22 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
146 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
12 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
257 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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0answers
232 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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0answers
9 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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6answers
8k views

Prevent Windows 7 from enabling power saving on USB 3.0 hub

I have installed a USB 3.0 hub on my desktop computer. I use it to connect an external USB 3.0 disk for backup purposes, and I have a problem: Windows 7 enables by default power saving for said hub, ...
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4answers
1k 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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38 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
127 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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2answers
717 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
248 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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0answers
222 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
55 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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0answers
37 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
821 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 ...
2
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1answer
323 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 ...
2
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1answer
614 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 ...
0
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1answer
871 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
270 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 ...
5
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2answers
8k 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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0answers
237 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
91 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 ...
2
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1answer
34 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 ...
3
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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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0answers
82 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
688 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
120 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
3k 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 ...