Systems to manage power consumption, such as system suspension and hibernation, CPU speed adjustment, disk spindown, battery usage monitoring, …

learn more… | top users | synonyms

4
votes
1answer
292 views

How to turn off screen under Linux/BSD?

How can I turn off my laptops screen from software side? ex.: under Scientific-linux, OpenBSD? Or the best I can do from OS side is just to show a black picture? Are there any solutions?
2
votes
2answers
423 views

Check if display is powered on in Linux

Is there a way to check if a display is powered on in Linux? I tried xrandr and xset but neither of these two gives me any information about monitor power. Using xrandr I can identify if the vga cable ...
2
votes
1answer
646 views

FreeBSD CPU frequency scaling on AMD Sempron 2100

I have FreeBSD 9.0-RC3 installed on an HP Thin Client that has a Mobile AMD Sempron(tm) Processor 2100+. I am trying to get cpufreq and powerd to manage the frequency of the processor, but I'm not ...
3
votes
0answers
582 views

Can't control brightness on HP Pav dv6t running Fedora 16

I installed FC 16 on my HP Pavilion dv6 with a 9-cell battery. I get approximately 7-8 hours on Windows 7, but at best 3 hours on Fedora. I cannot adjust the screen brightness using the fn keys, nor ...
5
votes
3answers
1k views

Will switching from Gnome to LXDE improve battery life?

I currently have Fedora 14 and the battery life is not so good. I am planning to switch to Fedora 16. Will I get significantly more battery life if I go for the LXDE spin instead of GNOME?
1
vote
3answers
5k views

Battery monitor for LXDE in Arch Linux

I have Arch Linux plus LXDE installed in my laptop. I want to know the status of the battery level. I tried to install batterymon, but got too many errors that I couldn't decipher. Is there any ...
2
votes
1answer
1k views

Power off USB storage device/port to avoid power consumption

A connected USB storage device, even if unused (unmounted, etc.), consumes power. How can I turn it off / turn its power off so that it doesn't consume power as if it was disconnected, but without ...
4
votes
2answers
336 views

How can I find out the estimated power use of my desktop computer?

Is there a way to get the computer power usage instead of battery load tracking (what for instance seemingly powertop does), which is obviously not too useful on desktops?
1
vote
0answers
438 views

Disabling lid-closure sleep while on battery in Debian Squeeze

How do you disable lid-closure sleep at the GDM screen (not logged in) on Squeeze?
4
votes
2answers
339 views

Powertop strange results

I have installed Ubuntu 11.04 and battery life decreased by 2 times. Powertop documentation says that there should be 3 wakeups per second, I have 800-900. I think it's very strange because I didn't ...
4
votes
2answers
931 views

How to prevent my screens from dimming (going black) from the command line

In KDE, there was a system setting where you could specifically set the monitors to never go black. Now I've switched to dwm and (it might not be related) my screens dim after about 10 minutes. How ...
9
votes
2answers
391 views

Screen doesn't always shut off on its own

It seems like when I have certain web pages focused, my screensaver will kick in, but the screen won't turn itself off. Does anyone have any ideas why this might be? Is there a way to disable whatever ...
2
votes
1answer
492 views

How to make the display go to sleep when screen is locked?

I’m using a Debian amd64 install with the default GNOME desktop. I’m aware that you can go into System | Preferences | Power Management, and choose to make the display go to sleep after a certain ...
5
votes
3answers
5k views

Disable USB power for USB controlled power strip

I have a USB controlled power strip that has a single usb port. If my computer is turned on and connected via usb to the power strip, the power strip will provide electricity to all the sockets. I ...
4
votes
1answer
1k views

How to properly prepare a server for power outages?

I have a personal Debian server set up, that I'm able to access in person and remotely, but normally I'm away from it and it's remote. It's on a battery-backup surge protector, but sometimes that ...
4
votes
2answers
6k views

How to avoid powering down certain USB devices when a machine is suspended

I'd like to maintain power supply to a USB-powered drive when the system goes into suspend (AKA S3 or "suspend-to-RAM") mode. Normally the power is cut while the machine is suspended, which causes it ...
3
votes
1answer
136 views

Adding efficient storage to a laptop-based system

I've recently asked an as-yet-unanswered related question. My question here is a bit different: I want to know the best way to add storage to a laptop-based system without sacrificing power ...
4
votes
2answers
742 views

Power management hook for running scripts on wake

I'm looking for a way to run an arbitrary script every time my laptop wakes up.
4
votes
0answers
708 views

DPMS does not work: the monitor is not switched off [closed]

I have a monitor which was properly switched off by my Debian PC when unused. I attached it to another machine and, this times, it is never switched off. In /etc/X11/xorg.conf, I have: Section ...
5
votes
2answers
739 views

Preventing battery from charging

I'm running on UPS power and would like to prevent the laptop's battery from charging, to increase the amount of power available to other devices. Is there a way to do this? update: The machine is a ...
2
votes
0answers
738 views

power management of USB-enclosed hard drives [closed]

With a typical USB hard drive enclosure, is the full range of drive power management functionality available? edit: moved this into a separate question: In what may be an unrelated matter: is it ...
2
votes
1answer
624 views

Screen fading out on GNOME, without ability to cancel

Sometimes, on my Arch Linux laptop, using GNOME for the desktop, my screen will fade out after a while of non-activity (even if I'm watching a video). This fade out is very slow, and can't be ...