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

learn more… | top users | synonyms

2
votes
0answers
205 views

Battery issues on a Lenovo Ideapad Z460 running Ubuntu 13.10

I've been using Ubuntu 13.10 on my Lenovo for more than 5 months without a problem. Yesterday I disconnected the AC adapter to take the laptop with me to the couch and it simply shut down. So I ...
10
votes
1answer
955 views

How do I make my laptop sleep when it reaches some low battery threshold?

I'm using Ubuntu, but I have i3 as my window manager. Under i3, when my battery reaches 0%, the computer will just abruptly shut down, no warning or anything. Is there a simple script or ...
4
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 ...
5
votes
1answer
335 views

command to reboot as non-root user

I am using LXDE on Debian. When logged in LXDE as user, I can click on the logout icon in the menu and choose one of the options: shutdown reboot logout suspend But when I type reboot or shutdown ...
4
votes
2answers
790 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 ...
2
votes
0answers
103 views

listen a power-button event in Python (no ACPI)

I am using a Debian machine which does not include the acpid package. Is there a way that I can reboot the machine using Python language when the power-button is pressed, without installing that (or ...
2
votes
5answers
5k views

Ubuntu 12.10 Fan overspeeding

I have installed Ubuntu 12.10 leaving Win 7 licensed version. But again as usual I need to fix so many issues. This time fan is generating lots of noise. It looks it is running at max speed. My ...
1
vote
0answers
51 views

Two “Audio codecs” have 100% power usage in PowerTOP - what does this mean?

Should I be worried? My battery power doesn't last long (~1hr), could this be the reason? How can I fix this (if it has to be fixed at all)?
8
votes
2answers
6k views

How to disable USB autosuspend on kernel 3.7.10 or above?

I've updated my HTPC from kernel 3.7.10 to 3.10.7 and it seems CONFIG_USB_SUSPEND is now gone from the kernel options and included in PM. The main problem I'm facing is that I have an external HDD ...
0
votes
2answers
120 views

Hard disk power management with image toggling in display

We have a system in which we almost toggle some display data in the screen 24 hours x 7 days a week. Since our application runs every day, we see some hard disk failures in the field. Unfortunately, ...
3
votes
1answer
230 views

Turn system on by USB keyboard?

To hibernate my Debian Wheezy system, I run the following command: sudo sh -c 'echo disk > /sys/power/state' To wake up the system, I can press any key on my USB keyboard. My understanding of ...
4
votes
1answer
423 views

Suspending laptop fails ~50% of the time

Running ArchLinux and GNOME 3 on a Thinkpad X220. When I suspend my laptop it goes into sleep mode and the LED ring around the power button fades in and out. When a suspend fails, the LED ring and ...
11
votes
4answers
2k views

OS X: how to keep the computer from sleeping during a ssh session

When I ssh into a OS X computer on my network the session lasts until the OS X goes into sleep mode. Is there a way to prevent this from happening during my SSH session, apart from physically bumping ...
2
votes
2answers
72 views

OS X: how to keep the computer from sleeping during a http connection

An application I use downloads data from a specific server, and I need it to sleep after the download has finished and the socket is closed. However downloads take place at random days, the app that ...
4
votes
3answers
2k views

How can I get an alert when my battery is about to die in Linux Mint?

This happens to me more than I'd like to admit, but sometimes I don't notice the power getting low since it only shows up in my status bar, then the computer just quits. I'd like a big alert that ...
2
votes
0answers
36 views

Find out if system startup was initiated by rtc alarm

How can I know if a system startup was initiated by an rtc alarm event in linux? I am writing some scripts that handle sleeping/shutdown of my htpc. I want the machine to sleep after recording has ...
3
votes
1answer
644 views

Closing lid on Crunchbang

I'm running Crunchbang on a laptop. I can't seem to find an option to toggle if the laptop goes to sleep when the lid closes. There are certain times where I want to put the laptop away or close it ...
0
votes
2answers
85 views

embedded linux and powering usb stick

I have a problem where I need to read a usb-stick or a usb keyboard: When I plug in the USB stick or keyboard I can't get power to the device. dmesg says nothing I tried: for device in $(ls ...
1
vote
0answers
693 views

MacBook Pro Retina: huge power consumption

I'm currently running Debian/Jessie on a MacBook Pro Retina 10,1 15" (early-2103). Everything is going well (ethernet, WiFi, retina, etc.) but I worry about its power consumption. laptop-mode manages ...
4
votes
1answer
4k 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
1answer
529 views

My Laptop Fans drive me crazy on linux and much less battery

I have a Vaio VPCEA36FG laptop and both windows.8 and elementary OS (ubuntu 12.04 kernel) installed on it. when I am in windows everything is just fine, fans work perfectly efficient and my battery ...
3
votes
4answers
2k views

How can I run an hdparm command after boot and resume on Fedora 19?

I bought a new HD(WD5000BPVT) which unfortunately tries to sleep every 5-8 seconds. Not only is the clicking noise quite audible, the 1-second spinup time adds very noticeable latency in day-to-day ...
1
vote
2answers
169 views

Which embedded Linux platform supports Suspend to RAM?

I am trying to save maximum energy for a certain embedded Linux application. Currently I am using Raspberry Pi. But it looks like Raspberry Pi doesn't support Suspend to RAM. What alternative embedded ...
0
votes
0answers
137 views

how to tell hibernate, if battery low

I need to tell to power-manager (with gnome-shell) , if battery is low,pm-hibernate will be run. Now i want to tell via gsettings commmand. How can i do it?
7
votes
1answer
283 views

How can I send power on/off signals to a VGA monitor?

I've used some old spare parts to make a sort-of kiosk for my kitchen. It's running OpenBSD and has a simple text based UI (no X Server). I plan to add an Arduino with a motion sensor that ...
3
votes
1answer
279 views

Does UEFI increase battery life?

I've heard about a better power management when using UEFI instead of BIOS. Is that true? It was about energy consumption being more efficient or something like that. If it is true, has the ...
6
votes
3answers
2k views

Get power consumption of a USB device

Is there a way to check how much power a USB device requires? Why do I need this? I need to connect an LTE USB stick to my Raspberry pi, and don't know how much power it needs. We got it quite ...
1
vote
1answer
445 views

Opening lid results in black screen (Dell Laptop with ATI Graphics, Ubuntu 12.04, 3.2 kernel, GNOME 3)

For the past few weeks, when opening the lid my laptop often fails to recover from suspension leaving me with a blank screen. Further, when this bug occurs, the laptop fans continue to run while the ...
9
votes
5answers
9k 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 ...
4
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 ...
2
votes
1answer
330 views

How to suspend from Gnome3 using systemd

Brief background information: I just installed Fedora 18 with Gnome 3.6.3.1 on my computer. It is connected to a Windows share (CIFS) containing music, which I play using Clementine. If I suspend the ...
1
vote
1answer
114 views

How to prevent the termination of Anacron jobs after battery mode commences?

I have a backup script which is run daily by Anacron. It can take around 3 hours to complete. I'm happy for Anacron not to commence the script if the laptop is running on batteries, but once started, ...
3
votes
1answer
178 views

Querying display power status on Linux (Xorg) on command line

Is there a way to query the power status of an Xorg/X11 display from command line? I want to know if my laptop LCD is powered on after the screen saver--apparently the backlight is still on. This is ...
3
votes
1answer
507 views

Power consumption monitoring problem

I used powertop v.2.1 under Ubuntu 12.04 but it missed the power est. column.It's the same situation as described https://bugzilla.redhat.com/show_bug.cgi?id=796068‎ and that bug is supposed to be ...
6
votes
1answer
4k views

How to Reset/Cycle Power to a PCIe Device?

I have a PCIe device that only works correctly when the computer is fully powered off then on again. Issuing a simple reboot or reboot -p command does not appear to cycle the power to the PCIe card, ...
5
votes
2answers
397 views

Do I need acpid in a virtual machine?

I'm always wondering if power management facilities in a virtual machine is necessary? i.e acpid. And I'm not sure if they still function in a virtual machine.
3
votes
0answers
155 views

Exynos 5 DVFS or turning off cores in Ubuntu - Scaling frequency for one of the cores only (dual core) (cpufreq)

I was wondering if there is possible to scale only one of the cpu cores in the A15 in Exynos 5 ? I have tried using e.g cpufreq-set -c 1 -f 500MHz, but both cores are set to the same frequency. When ...
5
votes
2answers
983 views

Return value of current watt consumption on command line

Is there a way to return the current watt consumption on the command line? I have found about the powertop program, but have not seen a way to return the Watt consumption as a value to the command ...
1
vote
1answer
156 views

any utility on centos 6 to sound an alarm when power is low

Is there an application that will set an audible alarm when the battery goes low on a centos 6 IBM 430 machine? Details of the problem here: I have set it hibernate when battery is low. However, it ...
5
votes
2answers
3k views

How do I make Powertop's suggestion's permanent?

When I run Powertop, and look at the Tunables screen, about twenty things are listed as Bad. I can toggle these to Good by pressing enter, and when I do so, projected battery lifetime doubles. How ...
1
vote
0answers
1k views

Intel Core i3/i5/i7 Sandy Bridge CPU throttling

Intel Sandy-Bridge family i5 Core CPU, running Linux kernel 3.2 (Debian Squeeze/Wheezy), under heavy computation load, does not react to to cpufreq-set -g powersave (using acpi_cpufreq module). It is ...
6
votes
1answer
690 views

pm-utils: No network in suspend scripts?

I'd like to put a script in /etc/pm/suspend.d/ that needs network access (for a very short time) before allowing the system to suspend. However, even with scripts named "001_something" in ...
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. ...
7
votes
1answer
267 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
4k views

What is kondemand?

I have searched the web for the answer of this question but couldn't find a clear answer. Best answer I found was as follows: kondemand is a kernel thread that belongs to the ondemand governor of ...
8
votes
2answers
559 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 ...
0
votes
0answers
377 views

Undervolting in Linux

Could you recommend me something different like Linux-PHC for undervolting in Linux? I would like to undervolt my AMD Phenom 9850 CPU. I am using Debian squeeze x64. For underclocking I use ...
1
vote
0answers
107 views

What changed in Linux kernel (2.6.22) that gives hdparm support for power-on in standby?

Hdparm man page lists for parameter -s: Enable/disable the power-on in standby feature, if supported by the drive. VERY DANGEROUS. Do not use unless you are abso- ...
5
votes
1answer
3k views

Why does drive not enter standby mode when using hdparm -S

When reading the hdparm manual pages, it says that the -S value is used by the drive to determine how long to wait (with no disk activity) before turning off the spindle motor to save power ...
3
votes
1answer
445 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 ...