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

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Detect if computer was started using WOL or power switch

Is it possible to check if a computer was started using Wake on LAN or using the regular power switch under Linux?
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1answer
69 views

Disable suspend/sleep mode completely on Fedora 21

I connect to a Fedora 21 workstation with SSH, but after several minutes not using the connection the system go to sleep and I loose my connection. So how can I disallow completely the system to go ...
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0answers
33 views

Is it safe to disable Frequency Scaling and CPU idle Power Management support for Real Time purposes?

I'm using a Raspberry Pi board and I would like to build a real time system. During the kernel configuration, I found the CONFIG_CPU_FREQ option, which (from the help section) allows you to change ...
2
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1answer
36 views

How to get current CPUPower governor

I want to get the current CPUPower governor. When I type cpupower frequency-info I get alot of information. I just want to get the governor just like "ondemand" with no more information to use its ...
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1answer
24 views

Why do I get mail when I unplug my adapter?

Usually I only get the terminal output You have new mail in /var/mail/$USER after running certain upgrades but I've started getting it every couple days after running other commands, seemingly at ...
4
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1answer
37 views

How to restrict/cut power output to a USB client?

...or, how not to charge my phone when I'm using it as a GSM modem in USB tether mode? I can use it as WiFi tether modem, but it wastes battery both of the netbook it supplies connectivity to, and on ...
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1answer
30 views

How to debug hard drive power saving?

My harddrives are not going to powersave. I have added the following lines into /etc/hdparm.conf: command_line { hdparm -S 25 /dev/disk/by-uuid/42d40d37-2859-457c-93d0-e4c617d06d9f } ...
4
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2answers
423 views

Eject / safely remove vs umount

I'm using Ubuntu 12.04, and when I rigth click on a my flash drive icon (in the Unity right bar) I get two options that have me confused: eject and safely remove. The closer I came to answer was this ...
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1answer
57 views

Can I check how much energy a USB device is consuming?

Is there any utility I could use to check how much energy a USB device is consuming, for a given time frame?
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38 views

Ubuntu server going to sleep or not using graphics card

I'm running a small web server on Ubuntu Server 14.04, and it keeps going into sleep. I found a solution that works here, which is "adding the kernel options "acpi=off apm=off"". I have done this, ...
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0answers
32 views

Suspend options with KDM greeter

I am not able to suspend my desktop to RAM from the KDM greeter. I am able to suspend it to RAM when logged into KDE using the sleep option from the logout menu and by pressing the sleep key on my ...
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0answers
22 views

Is it safe to use the -y and -Y flags to hdparm?

Is it dangerous to use the -y or -Y flag in hdparm during a write, or when the disk is still mounted, or will hdparm refuse to spin-down, or automatically sync and unmount?
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249 views

Where are pm-powersave settings on OpenSUSE 13.2, and are they used?

I am trying to sort out powersaving for OpenSUSE 13.2 running on a laptop. I found this guide: https://en.opensuse.org/Powersaving for understanding Powersaving on OpenSUSE. However, it appears to ...
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0answers
29 views

how to identify process which blocks suspend/hibernate

I have an intermittent problem with a laptop that doesn't sleep/hibernate after lid is closed. And I have no idea why. I suspect that some process blocks sleeping/hibernating. How can I identify ...
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0answers
81 views

CPU load and power management (frequency)

question background In my understanding the load value (shown e.g. by top) allows (together with the knowledge how many CPU cores the system has) a very quick assessment which share of the ...
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3answers
200 views

how to stop the screen from blanking / blacking out?

I have re-installed Debian 7 (Wheezy) after a while. For the first time, I am using the open-free nvidia drivers (not nouveau) and vesafb for virtual consoles. I cannot, for the life of me, stop the ...
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0answers
82 views

How to measure power consumption of a USB device?

The title says it. It has been asked how much power a port can deliver, but I do not need that. I need to get the power consumption of a plugged-in device in real time. This question was left ...
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1answer
3k views

Turning off power to usb port. Or turn off power to entire usb subsystem

I have a usb lamp which I specifically bought in order to turn it off programmatically at a certain time, thus I need to remove the power to its usb port. I believe I have a usb-hub at usb6. The lamp ...
0
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1answer
37 views

How do I immediately put a drive to sleep (without changing its power setting configuration)?

Within GNOME's "Disks" utility there is the option to immediately put a drive into sleep / standby, which spins down the platters. I would like to do this on my servers before pulling hot-swap drives ...
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1answer
851 views

CentOS 7 cpupower not setting the CPU's to maximum

On my machine, i have power savings disable on the BIOS. When I run Ubuntu on this machine, the CPU's are running maximum at 2100 MHz. However, when I'm running CentOS 7, even with the scaling ...
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0answers
143 views

indicator-cpufreq in arch linux

I'm an Ubuntu user testing out Arch Linux. So far I'm happy. On Ubuntu I used the indicator-cpufreq applet to control power profile both on Unity and Gnome-shell. On Arch, I cannot figure out how ...
0
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1answer
128 views

What is the suspend procedure in KDE?

I've been reading this question, and I'm wondering what is the procedure for suspending in KDE? Whether to RAM or to disk.. When I click suspend, or close the lid, what gets triggered? What is the ...
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0answers
45 views

Possible not restore cpu frequency after suspending and waking up?

When I suspend my Ubuntu 12.04 and wake it up, the cpu frequency I set by clicking indicator-cpufreq on the desktop panel will be restored. I wonder if that is a bug or some design? Is there a way to ...
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1answer
106 views

what does pm-suspend-hybrid do?

man says pm-suspend During suspend most devices are shutdown, and system state is saved in RAM. The system still requires power in this state. Most modern systems require 3 to 5 ...
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1answer
75 views

get system uptime on battery?

How to know system uptime under battery ? so that i can get exact time of battery backup the uptime shows complete uptime (AC/Battery) NOTE : I am using linux Mint 17.
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1answer
53 views

xscreensaver sometimes unlocks locked screen automatically, after returning from monitor standby mode

I am using xscreensaver to lock my screen. Additionally to that, my monitor goes to "standby" , i.e turn display off, after 30 minutes of inactivity. It has happened to me twice now, that I have ...
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1answer
166 views

Auto-hibernate with udev rule

I'm using Debian Jessie with systemd. In the past I've used an acpid script that let's my computer hibernate when the battery is 5% or below. In an attempt to make a replacement for that I've made ...
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1answer
156 views

Role of the Intel P state driver

I searched high and low for what “Intel P state” is and what it does. I found out that it has to do with performance and power consumption. I learned that if you build it in the kernel, it'll becomes ...
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0answers
53 views

Battery not showing in ArchLinux Arm

I have a portable USB charger/external battery pack. The exact model is this one http://goo.gl/d9CgCa. I use this battery pack to power my raspberry pi which runs ArchLinux ARM. I am trying to view ...
2
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1answer
162 views

Display power management in console

When in console (i.e. not in Gnome or KDE) the display will automatically power down in case of inactivity. It seems to me to be set to something around 30 minutes. This power management is completely ...
2
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1answer
169 views

Prevent Mint from suspending while playing music in Spotify

In Linux Mint 17 I have Suspend when inactive for under Power Management set to 10 minutes. The problem is that the system suspends even when I'm listening to music using Spotify. Is there any way ...
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1answer
38 views

Running applications depending on battery or charging

What are good program or script solutions to run specific applications depending on whether the laptop is running on battery or charging? In order to conserve battery, I automatically want to stop ...
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2answers
243 views

Suspend to RAM not working

I get following error when I try to suspend my laptop: failed to check authorisation: GDBus.Error:org.freedesktop.DBus.Error.Service.Unknown: The name org.freedesktop.PolicyKit1 was not provided by ...
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0answers
27 views

Show power consumption (not on battery)

There are several tools for showing the power consumption when running on battery (PowerTOP is one of the better knowns). Is there also a way of showing the power consumption when not on battery (i.e. ...
0
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1answer
74 views

Powerbutton freezes applications

I've just installed Debian Jessie and I'm trying to get systemd to do basic power management. systemctl suspend and systemctl hibernate works well to suspend and hibernate the system. Now, I want ...
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0answers
68 views

Disable USB drive from sleeping

I am loading fedora20 directly from a SATA drive connected via USB. The problem is that I will be working and all of a sudden the drive seems to have been put to sleep and nothing will work except ...
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0answers
95 views

How to get notification from upower when UPS is on battery

I have a Fedora Core 19 system powered via a desk-side UPS. I've connected the UPS' USP port to the FC19 system, and it was apparently recognized, as upower -d now reports its presence: ups ...
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0answers
92 views

Disable processor speed changes on AC vs battery [closed]

My Toshiba Satellite L300 laptop freezes when I plug in the AC power cord. The problem is, whenever the processor goes in power management or downclocks, the system freezes and shows colorful ...
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2answers
223 views

How to reduce disk access?

This is a follow-up question to How to reduce temperature on a Dell XPS (L502X)?. After reading the answer, I noticed that my harddrive is spinning constantly, even when running TLP in bat-mode ...
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1answer
789 views

xfce4-power-manager not updating; ACPI finding an unknown battery but working fine?

I recently upgraded my Asus S56CA Ultrabook and unfortunately my battery indicator in xfce4 stopped working. I am running Debian 8 (Jessie). uname -a gives me this: Linux 3.14-2-amd64 #1 SMP Debian ...
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0answers
7 views

automatic suspend does not work in Gnome [duplicate]

I have configured automatic suspend in Settings->Power, then one hour later nothing happen when the suspend time came. I checked the internet for some information and found there is a bug in Gnome ...
2
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0answers
51 views

Linux Wifi High Power Consumption

I'm running Fedora 20, kernel 3.15.6 and ath9 driver with an ateros card. My battery life is very short, on an older debian install I had around 3 to 4 hours, now I'm between 1 and 2 hours. Powertop ...
0
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0answers
42 views

Automatic sleep not working in Gnome

I have configured automatic suspend in Settings->Power, then one hour later nothing happen when the suspend time came. I checked the internet for some information and found there is a bug in Gnome ...
0
votes
1answer
626 views

How to reduce temperature on a Dell XPS (L502X)?

Problem My Laptop is running quite hot (sensors reports ~50-60°C) during normal usage. In my opinion this is too high to work comfortably over long periods. Especially the region where I rest my ...
4
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2answers
181 views

Determine status of laptop lid

I have a weird problem where my laptop will wake when it's closed, generating a lot of heat and causing much frustration. Is there a way that I can tell if the laptop's lid is closed so that I can ...
0
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1answer
209 views

How to give more power to a USB device (error -110)?

I’m trying to mount an external hard drive (2.5", USB, no separate power supply) on Debian 7, but it gives me (in dmesg as well as when trying to boot with the device connected) errors like: ...
0
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1answer
191 views

Hard disk drive spins up on laptop sleep/wake, can I stop it doing this?

I have in my Arch Linux-running laptop an SSD and an HDD; the latter I use seldom. It is mounted as /mnt/sdb5 and configured to spin down proactively when on battery (/etc/default/tlp, ...
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129 views

Nouveau power management with Nvidia Tesla graphics

I have a MacBook Pro 13" Mid 2010 with a Nvidia GeForce 320M (NV50 family (Tesla) according to this list). I installed Linux on this machine and wanted to use Nouveau as the video driver. Everything ...
3
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1answer
46 views

How can I ignore KDE's power-saving features for certain programs?

I want to use KDE Power Saving capabilities on my Desktop computer, such as suspend and screen-off. But, I want these capabilities be enabled only when some programs aren't running; for instance, I ...
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2answers
1k views

Debian Wheezy rebooting instead of powering off

I'm having a weird issue with my Debian Wheezy desktop. When I try to shutdown the system (either from Gnome or from the command line with shutdown -h now) the computer automatically reboots. The ...