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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Will a 300W UPS work fine if my PSU is 500W?

I am getting a UPS (Uninterrupted Power Supply), currently here are my options: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=BE500R-PH ...
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4answers
142 views

At what point does shutting a computer down become preferred to leaving it on from a longevity standpoint [closed]

As the title says. Basically, I have two small home NASes, one that backs the other up. Each has a bunch (5) of 2TB drives in RAID5. I'd like to turn the backup NAS off, but I run daily syncing. ...
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1answer
1k views

Is there analog of aticonfig --set-powerstate for open source radeon driver?

I'm running Ubuntu 9.04 on relatively old laptop with ATI Mobility x600 inside. On the last version of Ubuntu, when I was able to run proprietary fglrx driver, I was able to slow down graphic card by ...
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1answer
1k views

Is it possible to create individual power settings for each hard drive?

I have a number of different drives that I use for different purposes but I only use two of them frequently. I would like for the others to enter sleep mode when not in use, but never my main two. Is ...
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4answers
10k views

Does a UPS charge it's battery even if my computer is turned on?

I bought a new UPS and the manual says something like "the UPS must charge for 24 hours before it can work properly..." My question is, does it charge even if my computer is turned-on or should I ...
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7answers
219 views

Likely reason for not being able to power on an older computer?

I demoted my older desktop computer to a server a short while back and it has always had some sort of problem with powering on after a complete power loss. For instance, right now it's powered on and ...
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3answers
638 views

How to plug-in this hard drive?

I need to install this hard drive "WD800JD-60JRC0". It is Serial ATA. But what really confuses me is that it has molex connector. I think I can plug what I want: SATA power cable or Molex. But which ...
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3answers
167 views

How do I save power when Idling?

Let's say my computer is downloading a huge update, or maybe I want to perform a slow virus-scan that's likely to take hours. The question is, my machine is gonna be up all night, sleep/hibernate is ...
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3answers
860 views

Are there any benefits to ejecting my internal hard drive?

I have an SSD in my MacBook Pro as my boot drive. It also houses all of my applications, documents, etc. I replaced the optical drive with a mount for the original hard drive, which I only ...
3
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1answer
65 views

Power loss on home server setup

I have a mac mini server running at home. It acts as a web server and a file server. Recently, they have been doing construction on my street, and power will dip on and off 2 to 4 times per day. I ...
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In Ubuntu 9.10, how do I disable the “Your battery may be old or broken” notification on log in?

Every time I log in, I get this message. It's helpful to see once, but I don't need to see it every time I log in. Is there any way to disable it?
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3answers
172 views

What is the recommended delay to put LCD/LED screens to sleep?

My LCDs and LEDs screens are configured to enter sleep mode after 5 minutes of computer inactivity, and I have being using this setup for years. Today, I was wondering if I could lower this delay, ...
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5answers
1k views

How can I monitor battery state on a laptop running FreeBSD 8?

Is there any console tool that can be used to view battery status on a laptop (Dell Vostro A860) ?
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3answers
4k 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 ...
3
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2answers
4k views

Windows 7 directly turn monitor off when just listening to music

Windows 7, Laptop DELL XPS 1330: When just listening to music, I want to turn off my laptop display immediately. It perfectly works after the usual delay (e.g. 10 mins) set in the power management, ...
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4answers
3k views

Windows software to show computer's energy usage or battery discharge rate

Is there any software for Windows 7 which can show a computer's energy usage in real-time? I am currently using Battery Bar, which gives an estimated discharge rate, but this is essentially an average ...
3
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1answer
10k views

What is “Link State Power Management”?

In the Windows 7 Power Options, under "PCI Express", I can adjust "Link State Power Management". The options are: Off Moderate power savings Maximum power savings What do these settings do? Is ...
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4answers
2k views

Keeping Mac OSX up and sleepless while task / app is running

I want to leave rsync working over wifi for hours turned on AC power. But when I do so the Mac breaks the connection after some time. On Energy Settings pane it's configured to "Computer Never ...
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2answers
5k views

How much electricity does an external USB hard drive use when it's not being used?

My external USB hard drive requires its own power source. I noticed that if I don't use it for a while, and then try to access it later, it takes a while to startup, meaning that it was in some kind ...
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3answers
2k views

Computer hangs due to underpowered UPS?

I just bought a new UPS. Now since I started using it I experienced at least 3 random freeze in Windows 7 and it happens during the first 10 minutes of start-up. Note when I say freeze, I mean I ...
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3answers
581 views

What will the laptop do if I close the lid when plugged in then unplug it after I've closed the lid?

If my laptop is set to "do nothing when I close the lid when plugged in" and "hibernate when I close the lid when on battery, what will the laptop do if I close the lid when plugged in then unplug it ...
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2answers
247 views

Doubt about netbook energy modes

In my control panel there's an energy preferences option. There, I find a "Balanced" energy mode and a "Performance" energy mode. The only differences I detect are the brightness levels and the ...
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1answer
2k views

Changing the Start Menu Power Button - Setting does not work: only (Shut down) is available

This is the second time I've tried to change this setting on a Vista-based operating system and I can't get it to work again. OS: Windows Server 2008 SP2 (not R2) = Microsoft Windows [Version ...
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5answers
3k views

Forcing Windows to be 'awake' during certain hours?

I'm running Windows 7 and have the power options currently set up to put the machine to sleep after 2 hours of inactivity. Is there any way to force the machine not to sleep between certain hours, or ...
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1answer
172 views

Windows Power Options Clarification

So I was looking through the Windows 7 power options via Control Panel today, and I realized I had a couple of unresolved questions as to the nature of various choices. I was wondering if someone ...
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2answers
772 views

Using different SSDs types (not only SATA based) as system drive

Currently I have a Thinkpad X61s and want to make it both a bit faster and a bit more power efficient. For that reason I thought that adding SSD drive would make most sense. Unfortunately, because of ...
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2answers
1k views

How can I turn off external HDD totally (no not safely remove or auto-off)

There IS a solution for this. The problem.. I lost it. It was a ... hdparm? sdparm? smartmontools? I cant recall it. Anyway, it was using a Linux tool (Win port of it) to turn it off, and Unlocker ...
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2answers
1k views

Powering-down USB Powered Devices on laptop sleep

I recently purchased a Targus Lap Chill Mat, which is a USB powered device, but doesn't have any interface/storage/etc function. I'd like it to power-down when my (macbook) laptop sleeps (since the ...
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4answers
977 views

How to track which program causes my harddrive to spin up

I have a strange problem: Every half hour one of my hard disks gets powered on again. I recognize this by the sound of a hard disk spinning up. So far I was not able to track which program could ...
3
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1answer
5k views

How to disable screen shutdown after 1 hour in Fedora 17 (Gnome)?

Fedora 17 doesn't seem to have a "Never" option for the screen timeout setting. Is it possible to disable this power-saving feature? This is for a machine showing a dashboard which should always be ...
3
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1answer
1k views

Vista laptop keeps waking up a minute after I put it to sleep

I have used the command powercfg -lastwake to determine what is waking up my computer. Here is what it produces in prompt Wake History Count - 1 Wake History [0] Wake Source Count - 1 Wake ...
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498 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
979 views

Understanding battery information

My laptop is Lenovo T400 and OS is Ubuntu 10.10. Here is information about my battery: $ cat /proc/acpi/battery/BAT0/state present: yes capacity state: ok charging state: ...
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1answer
2k views

Why doesn't my laptop battery charge while the laptop is in use?

Up until a week ago, my laptop has always been able to charge the battery while I'm using it. Now, it will not charge unless the computer is sleeping, hibernating, or turned off. The icon in the ...
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2answers
72 views

Does temporarily suspending an idle chip reduce its lifetime?

Nowadays many chips, especially CPUs for portable devices can decrease the clock speed or even suspend for short periods of time to save power. This is great. Now when a chip reduces power ...
3
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2answers
610 views

Why won't the monitor go to sleep?

I have a Windows XP Tablet Edition running on an HP laptop. The laptop is always plugged in. I've set it up for the monitor to turn off after 10 minutes. Sometimes it works, sometimes it does not. ...
3
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1answer
959 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
646 views

(Touch Tablet PC ) Minimising LCD power consumption?

Would using black background and light foreground reduce the LCD power consumption? Or actually increases it? Please note, it is not only the power consumption used for luminocity of LCD that needs to ...
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2answers
2k views

laptop won't wakeup on mouse move, must open lid

I have a dell e6410 running Windows 7. I have a docking station with 2 displays plus a USB video display. My power settings are to turn off the display after 30min but never to hibernate or sleep. ...
3
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2answers
500 views

build a Linux server with “server” or “desktop” hardware?

I am Looking to build a Linux home server box from the ground up for my family and I. Id like the server to support file sharing, media streaming, print, virtualization, and remote desktop services. I ...
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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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3answers
2k views

Windows 7 PC no longers goes into power saving mode

Recently, my computer stopped honoring the power saving settings. It stays on all the time, even though I have it set to go into sleep mode after 20 minutes of inactivity. It used to work as ...
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2answers
5k views

Disable Power Management in Fedora 12

How to disable the power management in fedora 12, so that lcd/monitor should not go to sleep/off when system is idle?
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3answers
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How do I get my laptop's screen brightness settings back?

From when I bought it up until yesterday, my laptop would dim the screen automatically if you let it sit for long enough, and then if you hit a key or moved the mouse, the brightness would jump back ...
3
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1answer
993 views

Off vs standby. Which is better for an office laser printer?

At an office where I work, there is a Samsung CLP-310 laser printer: The staff turn this off every evening. Right off -using the hard power switch on the back. They are trying to reduce their ...
3
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1answer
264 views

Closing the lid of laptop slows down downloading files [duplicate]

I would like to download files from the intelernet on my lenovo laptop with windows 7 when the lid is closed. Unfortunately the download slows down almost to zero when the lid is closed. Answers to ...
3
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1answer
365 views

Windows 8 randomly powers up pc?

I have installed Windows 8 PRO on my Asus UX31E (Zenbook) and sometimes happens that after I leave it charging after powering it off, I found it powered up (actually I found it in sleep mode because ...
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1answer
546 views

Switching between intel sandy bridge GPU and discrete video card on the fly

Is it possible to disable the discrete GPU(s) without physically fiddling with the hardware, and run the system exclusively on intel sandy bridge GPU - in order to save power? Can one do the switch ...
3
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1answer
751 views

How to disable brightness intensity switching by power plans and AC/battery modes?

This is a "feature" in Windows 7, but I can't see how it is useful; it just annoys me. Every power plan and the AC/battery mode has its own setting for brightness intensity. So, if I switch power ...
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2answers
872 views

power management of USB-enclosed hard drives

With a typical USB hard drive enclosure, is the full range of drive power management functionality available? In what may be an unrelated matter: is it possible to suspend a PC without unmounting an ...