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

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2
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1answer
568 views

Preventing ChromeOS from blanking the screen when working on a different tty

I am running Archlinux in a chroot alongside Chrome OS on a chromebook. The original project is there, my fork of it is here (mostly similar). The issue is that the display power management of Chrome ...
2
votes
1answer
144 views

Measuring the current or the power

Is there a way to measure the electric current or power of the whole computer or its components using software? Voltage can be measured, and I am wondering why not with the current/power.
1
vote
1answer
95 views

ACPI (Advanced Configuration And Power Configuration) not present on 2.6.38.8?

I need to disable some parts in ACPI, but it is simply not present in kernel 2.6.38.8 (downloaded as a tar from net)? I can see the option in kernel 2.6.34-12 (default on OpenSuse 11.3), but not in ...
1
vote
1answer
527 views

Hibernate does not power down laptop

I have an Asus U30J laptop with both windows 7 and Linux Mint 12 installed. When I try to hibernate the laptop, the following message appears on the screen and I have to push the power button to ...
2
votes
0answers
296 views

Ethernet NIC power usage on laptop?

I was wondering if the ethernet NIC draws any power at all when using Wifi? If it does, since I rarely use it, so is there a way to completely turn off the power from the device? I know some devices ...
6
votes
1answer
577 views

Linux kernel 3.3 power regression

I am using Fedora 16 in my DELL n4110. I recently upgraded the kernel from 3.2 to 3.3. In contradiction to the official claim, my system still drains battery as hell. It only provides 1:30 to 2 hrs of ...
1
vote
1answer
487 views

Can Bumblee really help with Optimus Laptops?

I bought Lenovo Z570 which comes with nVidia GEForce GT520M (Optimus technology) and recently I installed Ubuntu 11.10. Surprisingly, whenever I boot my system CPU fan rotates at very high speed and ...
0
votes
1answer
169 views

Battery management - are there differences between distros?

I have heard that Linux, in general, has poor notebook battery management: the battery lifetime is reduced significantly (I have noticed it on my MacBook 2.1 with Ferdora installed) Are there any ...
2
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0answers
687 views

on puppy linux, how to manage power settings

I'm new to using Puppy Linux, and I'm not able to find a way to manage power settings. The laptop stops working everytime I close and re-open the lid so I want to disable that function from doing ...
0
votes
1answer
407 views

CPU governor settings

What are CPU governor settings? How can I get their values, if they're set? I have 24 vCPUs on my machine.
1
vote
1answer
994 views

How to power off USB stick or MMC card under linux?

Usually I just unmount the usb stick or mmc before unplugging it but I'd prefer to turn the power off before doing so. I think Windows does this, so the hardware should allow for turning off the power ...
1
vote
0answers
348 views

Cannot control brightness with Fedora 14 on Compaq CQ42

I've done the primary searching of similar questions, Found some, tried the solutions and they didn't work for me. So asking again. All the keys of my Fn combination works except the brightness ones. ...
2
votes
1answer
1k views

Ubuntu 10.10 notification system area , many icons disappeared like network manager

When I restarted the computer I found no network icon. I tried to access internet but no connection was found. I also didn't have the Bluetooth, sound, battery, and power icon. Its really crazy that I ...
5
votes
3answers
331 views

Power management hook for running *X11* scripts on wake

Earlier I asked a similar question, but that one was about running system-level scripts. I have a script that runs a series of xinput commands in order to enable two-finger scrolling on my touchpad. ...
4
votes
2answers
2k views

Slow down the CPU

I tried to slow down my CPU with powernowd and cpufreq-selector. I hoped that with lower frequency it will be less hot and I won't hear my fan every time I will run internet radio. I used the ...
3
votes
2answers
359 views

How to identify if there is some power saving setting that powered down a processor in Linux

I have a linux server that apparently has two Intel Xeon X5670. /proc/cpuinfo shows 12 CPUs but dmidecode shows only one CPU and the other one is in the Unpopulated status like it is showing that ...
4
votes
1answer
300 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
436 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
696 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
593 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 ...
6
votes
3answers
2k 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?
2
votes
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
366 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?
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0answers
467 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
358 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
1k 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
525 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 ...
4
votes
1answer
2k 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
771 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.
5
votes
0answers
755 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 ...
6
votes
2answers
767 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
782 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
666 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 ...