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

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Hibernate not working in Linux Mint 14 KDE after nvidia driver update

I've had some problems with the X server ramping up CPU usage, so I wanted to check if it goes away to a new Nvidia driver. I was at 304.xx and jumped to 319.49. Now, every time I try to hibernate, I ...
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0answers
16 views

Suspend option disappear from shutdown dialog on Mint 17.1 Cinnamon

Previously I have a "Suspend" option when I open shutdown dialog, not sure why (probably because I did a apt-get upgrade I found the "suspend" option has gone: Another thing is even I set my power ...
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1answer
454 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 ...
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0answers
20 views

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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2answers
6k 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 ...
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1answer
75 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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6answers
3k 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 ...
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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 ...
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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 ...
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2answers
17k 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 ...
2
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1answer
428 views

Acpid and Startup Brightness

On Arch Linux on my laptop, I have acpid control the brightness level based on AC plug events. Plugging in gives me max brightness and running on battery sets it at the minimum. My problem is that ...
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0answers
34 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
38 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 ...
6
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3answers
204 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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5answers
3k 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 ...
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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 } ...
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2answers
427 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
58 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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5answers
3k 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 ...
2
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1answer
222 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 ...
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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 ...
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6answers
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 ...
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1answer
6k 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 ...
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0answers
39 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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5answers
13k 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 ...
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3answers
2k 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 ...
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3answers
13k 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 ...
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0answers
33 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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0answers
257 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 ...
3
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1answer
2k views

How to get ondemand governor on fedora

In Ubuntu 13.10 on my (Dual Core i5 Lenovo G570) laptop, I recently discovered the wonders of indicator-cpufreq, so I can extend my battery life dramatically by setting it to 'ondemand' or 'powersave' ...
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0answers
83 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 ...
6
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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 ...
9
votes
1answer
276 views

How to prevent the Linux kernel from waking a secondary HDD from sleep

Is there a way to instruct the (Linux) kernel not to wake up a secondary hdd after a system sleep/wake-up cycle? I'm asking because in my laptop I have an SSD as a primary drive containing the system ...
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
862 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
145 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 ...
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1answer
131 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 ...
1
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1answer
109 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 ...
1
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1answer
77 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.
0
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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
169 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 ...
0
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1answer
157 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 ...
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 ...
5
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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 ...