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

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16 views

TLP overrides auto-suspend configuration

On my ThinkPad x201, I've been having problems where the computer will shutdown once it has been suspended to RAM, so I disabled the auto-suspend when the lid is closed by editing ...
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1answer
21 views

Will a running program be killed if I suspend my OS?

I am running a program. If I suspend my OS (Ubuntu 12.04) in the middle, will the process of the running program be killed? If not, when I wake up my OS, how can I resume the process? Thanks!
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1answer
35 views

Writing a suspend-aware program in linux

Programs that depend on physical time, such as jackd and its clients, do not play well with software suspend of a laptop in linux. I would like to fix a client that starts issuing plenty of "timing ...
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0answers
18 views

Laptop doesn´t go to sleep if HDD is in standby

So I have one mSata-SSD where my whole System is installed and one HDD where I put my Videos and Music! I don´t need my HDD all the Time so I put it to sleep on Startup sudo hdparm -Y /dev/sda The ...
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1answer
103 views

Setting CPU governor to on demand or conservative on Arch Linux

I'm struggling with cpupower on ArchLinux. I want to set governor to ondemand or even to conservative. First if I do $ sudo cpupower frequency-info --governors, I only get performance powersave. So ...
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1answer
31 views

What program displays volume/screen brightness under KDE?

It seems there's some bug in KDE related to power management and after putting my netbook to sleep several times, plugging it in and out, the notification about screen brightness set to 100% doesn't ...
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1answer
48 views

Reporting cpu hogs

Once in a while some program (ok, usually it's firefox) will start eating up nearly 100% of a processor's cpu time, heating up the processor and driving down by laptop's battery life. Since it's not ...
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1answer
73 views

How to change Power button shutdown action

I use Mageia ver 4 Linux as server, without X started and without any user login-in during normal operation. This PC has a special card for measuring and control of other devices. This card has its ...
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1answer
101 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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1answer
28 views

What is the worst scenario, if the hard disk or motherboard don't support the `hddparm -s`?

I have a desktop PC, that dubs as a RAID-6 server. When I don't need the RAID-related stuff, I'd like to spin off all the hard drives involved in RAID (I hate the noise). Unfortunately, even if ...
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0answers
56 views

How do I stop charging the battery way prior to 100% in OpenBSD?

I'm thinking about using a netbook as an OpenBSD server. I'd like it to have UPS -- so the integrated battery is quite useful. However, I'm very familiar with the batteries going dead very quickly ...
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1answer
71 views

Shutdown my (backup) hard disk on Linux when I don't use it

I have a hard disk in my computer that I use to make backups of my data. I do not use this disk otherwise. How can I stop this disk from spinning once my backup is finished? Also how would I make it ...
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1answer
223 views

“Memory corruption detected in low memory” kernel messages?

I have some memory corruption detected in low memory messages. I have read about it here, but I'm afraid I can't really make anything out of the discussion. It does indeed happen when I ...
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1answer
45 views

openSuSE power management from command line

I'm using openSuSE 13.1 as a text-only server on an old netbook. A couple days ago, I was able to set it so that it didn't suspend or power down when the lid closed. I had to reinstall the OS today, ...
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0answers
140 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 ...
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1answer
98 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 ...
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0answers
55 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 ...
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37 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)?
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2answers
73 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, ...
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1answer
145 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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2answers
59 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 ...
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0answers
29 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 ...
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2answers
65 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 ...
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569 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 ...
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2answers
3k 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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1answer
373 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 ...
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365 views

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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2answers
118 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 ...
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76 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?
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1answer
202 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 ...
9
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1answer
657 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 ...
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3answers
1k 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 ...
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4answers
1k 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 ...
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1answer
449 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 ...
2
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1answer
234 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 ...
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1answer
89 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
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1answer
154 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 ...
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1answer
447 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 ...
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2answers
183 views

What does the package UPower output if on a desktop

On Ubuntu 12.04, if I use the command: upower -i /org/freedesktop/UPower/devices/battery_BAT0 It will output all of the statistics for the battery. However, what does it output if I am using a ...
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1answer
3k 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, ...
4
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2answers
301 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.
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138 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 ...
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1answer
263 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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1answer
231 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 ...
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1answer
355 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 ...
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2answers
630 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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1answer
342 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 ...
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1answer
131 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 ...
4
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2answers
2k 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 ...
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0answers
874 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 ...