Tagged Questions

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

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8
votes
2answers
592 views

System-wide power management policy on debian-based distros?

I would like to put idle machines in our lab (running Mint Debian edition) on standby after a timeout. I have tried pm-suspend and it puts the machines on standby and wakes up fine. Does anybody know ...
1
vote
0answers
278 views

How to disable nvidia ion on Asus eeepc 1201NL?

It seems that my netbook consumes battery too aggressively. I've been told that Nvidia ION videocard embedded into it has 2 cores and one of them is consuming battery all the time in Linux, since it ...
4
votes
1answer
475 views

How to stop waking all attached drives on reboot / deactivating swap?

A fresh install of Debian 6.0.6 for a system has 13 SATA drives attached. 12 refurbished WD-10EARS drives are yet unpartitioned. 1 WD1500BLFS drive is configured for OS and swap. Swap partition is ...
1
vote
3answers
910 views

Why kernel 3.6.2 is so much less energy efficient than 3.6.1 on Mint 13?

I noticed, that the power consumption in my ASUS P53E notebook is doubled (from 10W to 20W) when I change from kernel 3.6.1 to 3.6.2 (or later). I use Ubuntu Quantal mainline kernel from ...
1
vote
1answer
317 views

Thinkpad T400: Suspend to HD doesn't resume

I've got a Thinkpad T400 with Gentoo Linux installed. Suspend-to-RAM works like a charm. However, Susped-to-Disk doesn't work: if I suspend, the Laptop powers down and accesses the HD for around 30s. ...
5
votes
3answers
1k views

How can I set power button (on computer case) to power off system with `systemd`?

How can I set the power button (on my computer case, not keyboard) to power off the system with systemd (without acpid)?
7
votes
1answer
468 views

Is it possible to automatically wake from suspend?

Here's my problem: I have a laptop running Arch that I just keep on at home. It's got a good 4 hour battery life, but sometimes my daughter is playing near where it's kept and ends out pulling the ...
5
votes
1answer
5k views

How to adjust charging thresholds of laptop battery?

My laptop is Lenovo T400, and OS is Ubuntu 12.04. I have not been able to adjust the thresholds for battery starting charging and stopping charging. I observed that its current starting charging ...
2
votes
0answers
202 views

Console won't power off on PowerPC with Debian

I installed Debian 6.0 on a Power Mac G5. First it would boot to a blank screen but I fixed that by blacklisting nouveau as described here. Now the monitor will never turn off. It's a server so I'll ...
8
votes
1answer
278 views

Power saving enables touchpad

I've installed power saving packages (bumblebee, laptop-mode-tools, and cpufreq) to my laptop with Debian Wheezy. Thanks to that I decrease power usage from 32W to 10W. But now I faced the issue that ...
1
vote
1answer
2k views

Debian hibernate problem PM: Swap header not found

I have Debian 6 2.6.32-5-amd64 on netbook. With pm-utils Sleep works but hibernate fails with error: PM: Swap header not found!. Swap was enabled using ubuntu tutorial after installation - this is ...
2
votes
1answer
149 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
99 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 ...
2
votes
1answer
545 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
3answers
3k views

Avoid display blanking under X

I have an Ubuntu Linux box (12.04). I can't prevent the screen blanking under X. I have tried the command xset s off, inserted the command line kernel parameter acpi=off in grub at kernel boot. ...
2
votes
0answers
331 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 ...
2
votes
2answers
601 views

How to increase the timer before drive spins-down?

I use Ubuntu 12 beta on a Lenovo Z575. I noticed that the disk spins down a few seconds after the last operation. When I am working, e.g. in the vim and write quite often, it spins-up and -down ...
7
votes
1answer
585 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 ...
5
votes
2answers
855 views

How do I prevent GNOME suspending while I finish a compilation job

I am trying to build a custom kernel for my machine which is taking a long time to build (as expected). Is it possible to stop my GNOME desktop from suspending the machine until the compilation has ...
0
votes
1answer
175 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
votes
0answers
759 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 ...
2
votes
3answers
8k views

How to turn off all screensaver/display power saving methods under Scientific Linux 6.1?

How can I ensure that my screen won't go "black" after given time?
0
votes
1answer
441 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.
2
votes
1answer
624 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 ...
1
vote
1answer
1k 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
1answer
492 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 ...
1
vote
0answers
361 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. ...
4
votes
2answers
385 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 ...
5
votes
1answer
321 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?
3
votes
0answers
602 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 ...
2
votes
1answer
754 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 ...
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 ...
5
votes
1answer
3k views

Setting CPU frequency guidelines

I'm changing my CPU frequency because of noisy fan. I used sudo cpufreq-selector -g powersave for this purpose, but I replaced my Linux system Xubuntu with Lubuntu because it utilizes better ...
7
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?
8
votes
2answers
14k views

Ubuntu Server Continuously “goes to sleep”

I am running a web server at home using Ubuntu 11.4 (maybe? I can't 100% recall) on an older AMD 2400+ desktop with 1 or 2 GB of RAM. Sorry I can't recall the details 100%. Anyway, I have a KVM ...
1
vote
1answer
2k views

No gnome-power-manager command but it is installed on Arch

I'm running latest Arch, have GNOME and Fluxbox and my main windows manager is Fluxbox. I wanted to manage my power settings in Fluxbox and i added gnome-power-manager in startup but is says there ...
2
votes
1answer
2k 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 ...
5
votes
2answers
401 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
498 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?
5
votes
2answers
383 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 ...
10
votes
1answer
546 views

Screen brightness reverts to max after returning from `xset dpms` display suspend

I'm running the openbox window manager and using this line in my autostart.sh to control display power management: xset dpms 0 60 0 This works nicely, causing the display to suspend after 60 ...
5
votes
2answers
4k views

Powertop tunables: what does it do?

I just installed Powertop 1.98 on my laptop (T420 + FC15). There is a section called "Tunables". Half of my devices show as Bad. I see I can toggle from Bad to Good? What this section is for? What ...
6
votes
6answers
5k views

How can I improve battery life in Fedora 15?

I am seeing a horrible battery life with Fedora 15 (lovelock) with Gnome Shell 3 on my laptop. I keep the screen brightness, back light pretty low. I still get about 1 hr 50 minutes battery life out ...
2
votes
2answers
461 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 ...
4
votes
1answer
576 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 ...
5
votes
5answers
7k 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 ...
5
votes
2answers
3k 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 ...
9
votes
5answers
10k views

How to find power draw in watts? [duplicate]

I've been asked to estimate the power consumption of the servers I run for my laboratory. I thought and I'd ask if there was some handy linux commandline to get the power consumption of the server. It ...