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

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9
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3answers
3k 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
514 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
11k 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 ...
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 ...
2
votes
1answer
422 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
132 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, ...
4
votes
1answer
219 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
594 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
5k 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
484 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
177 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 ...
1
vote
1answer
171 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 ...
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 ...
7
votes
1answer
786 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. ...
8
votes
1answer
280 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
5k 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
602 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
412 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
122 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- ...
6
votes
1answer
4k 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 ...
4
votes
1answer
497 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
0answers
288 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 ...
1
vote
1answer
328 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. ...
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 ...
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
483 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 ...
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
0answers
208 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 ...
10
votes
1answer
555 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 ...
2
votes
1answer
630 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 ...
2
votes
1answer
150 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
100 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
546 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
0answers
339 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 ...
7
votes
1answer
589 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 ...
1
vote
1answer
494 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 ...
0
votes
1answer
176 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
777 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 ...
0
votes
1answer
449 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.
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
0answers
366 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. ...
2
votes
1answer
1k views

Ubuntu 10.10 notification system area , many icons disappeared like network manager

When I restarted the computer I found no network icon. I tried to access internet but no connection was found. I also didn't have the Bluetooth, sound, battery, and power icon. Its really crazy that I ...
5
votes
3answers
345 views

Power management hook for running *X11* scripts on wake

Earlier I asked a similar question, but that one was about running system-level scripts. I have a script that runs a series of xinput commands in order to enable two-finger scrolling on my touchpad. ...
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 ...
4
votes
2answers
393 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
327 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?
2
votes
2answers
468 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 ...
2
votes
1answer
773 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 ...
3
votes
0answers
605 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 ...