Questions related to power management, particularly power saving measures.

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6answers
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USB Mouse sleeping after 5 seconds when on battery [duplicate]

My usb mouse sleeps after 5 seconds of inactivity when running on battery power. It wakes uo again when i press any button on the mouse. This is really annoying. I have made lsusb, and I noticed my ...
5
votes
2answers
9k views

What is the command for sleep/hibernate? [duplicate]

Possible Duplicate: How can I suspend/hibernate from command line? I have an Acre Aspire One and this netbook does not have a sleep function on the key board and with the removal of the ...
5
votes
3answers
7k views

Poor battery life in Ubuntu 12.10 on Toshiba p755-s5215, how can i manage background applications?

I have a dual-booted laptop, where windows gives a good 3.5 hours on battery, while on Ubuntu 12.10 my laptops runs only for 2 hours. I heard about powertop and laptop-tools, but after installing ...
5
votes
2answers
3k views

What prevents setting ATI / radeon power_profile from boot and retaining it after suspend?

I'm successfully using the open source radeon driver and use KMS-power_profiles (see link below) for power management of my graphics to prevent overheating. But I can't manage to set the power_profile ...
5
votes
1answer
2k views

How do I keep my screen from going dim when idle?

Apparently, the new version of Unity is based on Gnome 3. Apparently, Gnome 3 decided to do away with a huge chunk of the options available to me. It used to be that when I went to System Settings -> ...
5
votes
1answer
2k views

UPS Compatibility with Ubuntu Server

I'm looking into getting battery backup unit to protect my Ubuntu server. How can I find out if it is compatible with Ubuntu (11.04)? Ideally I'd like to be able to tell the server when there is a ...
5
votes
2answers
3k views

Laptop shuts down on lid close

When I close the lid of my Asus X77JQ, lucid shuts it down automatically after five minutes. I want to be able to sleep in the same room as my laptop, so I would like to be able to close the lid ...
5
votes
3answers
12k views

How to stop screen going black after 10 min

My OS is Lubuntu 13.04. After 10 mins of inactivity the screen goes black. What I did to stop it without effect: uninstalled xscreensaver completely in power setting I set to never blank the screen ...
5
votes
2answers
11k views

Put HDDs in standby after X minutes using hdparm doesn't work

I use Ubuntu 12.04 on a home server. There are 5 hard drives: one SSD with the OS and 4 HDDs (Samsung HD204UI) configured as a RAID5 using mdadm. I don't need the RAID very often (say, about once per ...
5
votes
3answers
508 views

How can I adjust the time that automatically reduces the brightness of screen?

At the moment it uses just a few seconds of inactivity after that ubuntu reduces the brightness of my screen. Where do i find the option to increase this value?
5
votes
4answers
3k views

How can I find out the current drive spin-down time?

I'm interested in manually adjusting my hard drives' spin-down times with hdparm -S to make them quieter at night. The first thing I need to know is what their current spin-down times are, to use as a ...
5
votes
1answer
94 views

How green are Ubuntu and Canonical?

im a student of Environmental Engineering, currently searching for a Bachelor Thesis Theme. I am curious, if there any internal information about Ubuntu related to CO2/Energy saving compared to other ...
5
votes
1answer
466 views

Is there a bug report tracking the power regression in the 2.6.38 kernel?

I'm looking for an official bugtracker entry (either ubuntu, or kernel) which tracks the story of power usage regression described in: ...
5
votes
1answer
1k views

My Thinkpad X201 battery is draining extra fast. What can I do?

I got a new Thinkpad X201 last week with the 6 cell battery, which is advertised to work for 5 hours. I installed Ubuntu Maverick on this machine right away. My battery life is only around 2 hours. Is ...
5
votes
1answer
2k views

Lenovo ThinkPad L520 slows down when AC power adapter is plugged in

I have a new laptop Lenovo ThinkPad L520 (7859-5BG) Core i5-2520M(2.5GHz) with 4GB RAM. Having installed Ubuntu 11.10 32-bit, while browsing with Chrome on GNOME classic (no effects), I noticed 173% ...
5
votes
1answer
4k views

Intel HD audio codec power management

Is it possible to enable power management for intel-hda sound card audio codec ? Power management for the card itself works fine, but audio codec module (/sys/module/snd_hda_codec) doesn't seem to ...
5
votes
1answer
551 views

How can I change what action is caused when the power button is pressed?

I want know if there's a way to change the action when the power key is pressed. I use Ubuntu 11.10 and when it is pressed it opens a small window with shutdown options. I want know how to change ...
5
votes
2answers
1k views

Will Ubuntu Server properly manage the power settings on a netbook?

I'm planning to install Ubuntu Server on a netbook to minimize power consumption. Are there any special considerations I should make for this kind of setup? Will Ubuntu Server properly manage the ...
5
votes
2answers
1k views

Ubuntu 12.04 LTS fails to recognize my laptop as laptop [closed]

This is probably going to sound like a rookie question, but I have never ever experienced such issue. I had Ubuntu 11.10 without Unity installed on my old laptop Thinkpad Z60m. Few days ago, I got ...
5
votes
1answer
774 views

Booting hangs at “Checking battery…” [closed]

Ubuntu 9.04 (JAUNTY JACKLOPE version)Installation Guidance REQUESTED. I am a quite new user (more proper to say “..a learner”) of Ubuntu. I am a Sr. citizen. Please guide and help me in the matter ...
4
votes
2answers
5k views

Closing the lid isn't toggeling standby anymore after update in Lubuntu. How can I fix that?

On my netbook closing the lid only leads to lock screen and not to standby in Lubuntu. That happened after the update on 11. 0. In 11.04 that worked without problem. Also, in 11. 10 Ubuntu (Unity) ...
4
votes
5answers
8k views

Does Jupiter really improve battery power?

I installed Jupiter on Ubuntu 11.10 and set the preference mode to "Power Saver" but haven't seen any noticeable difference. Does it really do what it claims?
4
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2answers
851 views

How is the Magic Trackpad's Battery Life (with Ubuntu)

What are other peoples experiences are with the battery life of the Apple Magic Trackpad using Ubuntu? I think I've emptied included batteries after about two weeks usage for five days a week, eight ...
4
votes
1answer
5k views

How to prevent XBMC from shutting down or suspending your computer?

Since I run XBMC as a program, and not standalone, I would just like it to exit when I click the power button. The default behavior is to show the shutdown menu, and I don't want to accidently shut ...
4
votes
2answers
810 views

how can I run my script automatically on ac switching

So, I wan't to run it when start work on AC and this or better other script when start work from battery I tried /etc/acpi/power.sh adding symlink to /etc/laptop-mode/battery-start It seems to ...
4
votes
1answer
853 views

In terms of battery usage, which distro is more efficient between Lubuntu and Xubuntu?

Installing both on the same laptop without doing nothing more than the normal install, which one consumes less battery power at the end and makes the laptop last a little bit longer than the other, ...
4
votes
3answers
4k views

Laptop does not suspend when lid is closed

I'm a new Ubuntu 13.10 user. Closing the lid of my laptop does not result in the computer entering suspend mode, meaning each time I close my lid without manually suspending the computer the battery ...
4
votes
2answers
3k views

Modify actions when battery is critically low?

I am running Ubuntu (not Xubuntu) and am using Xfce4 on my laptop. When my laptop battery is critically low, Ubuntu/Xfce4 performs some action (perhaps hibernate?) which causes my laptop to shut down. ...
4
votes
1answer
482 views

Is there a program that can adjust display brightness according to battery percentage?

When i work in Kubuntu, KDE power management has a section that lets you automatically adjust display brightness according to battery percentage. I want to know if there is a tool like that in Ubuntu ...
4
votes
3answers
16k views

How to enable hibernate on Ubuntu 13.10? [duplicate]

Something I usually do after installing Ubuntu is reactivate the hibernation function. I find it quite useful to function for the more energy concious. Typically, I'd complete the instructions in ...
4
votes
1answer
117 views

Which file is called or event is fired when we plug-in / plug-out power supply to the laptop?

Everytime I plug-in or plug-out powersupply the CPU frequency is changed to 'powersave' which results in reduced efficiency. I need to be on 'performance' all the time. I've made a small java utility ...
4
votes
2answers
7k views

Power on/off USB ports

Is it possible to on/off specific usb port using terminal in ubuntu? lsusb displays the following result Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device ...
4
votes
2answers
107 views

Is it possible to put X to sleep, leaving the rest of the system awake?

Imagine a computer with two functions: A fileserver and local webserver, required 24/7. A graphical server for a media centre, only required when somebody is using it. I am considering building ...
4
votes
4answers
7k views

Keep Ubuntu Server running on a laptop with the lid closed?

I decided to use my Eee PC 1001HA as a home server. I have it connected through Wi-Fi to the router, running Ubuntu Server 12.04. Everything works fine except this annoying problem: when I close the ...
4
votes
2answers
4k views

Overheating using a i7 Intel processor while using Ubuntu

I use a Intel i7 Dell-laptop. I installed Ubuntu 12.04(64bit) from scratch. I realized the CPU temperature increased immediately(it's not difficult to detect temperature with this computer only by ...
4
votes
3answers
1k views

Is there a power saving way to download torrents?

I usually download my torrents at night, while I'm sleeping. But when doing so, Ubuntu loads the entire desktop interface, while I only need the torrent client. I would like to use an energy saving ...
4
votes
4answers
10k views

Power Management - Sleep / Wake up Server when accessed

I have a headless HP Proliant Microserver with ubuntu installed. This machine has samba shares on it serving media and I usually rdp or ssh into it. Now my issue is I want the machine to go into sleep ...
4
votes
4answers
4k views

Monitor won't enter power save mode

My LCD monitor won't enter power save mode. I've gone into System → Preferences → Screensaver, clicked Power Management, then set Put display to sleep when inactive for: to 10 minutes (for both On AC ...
4
votes
1answer
2k views

Xubuntu 13.10 shuts down without asking when power button pressed

Since I upgraded to Xubuntu 13.10, I can't seem to make the power button bring up the xfce shutdown dialog. I never had this problem on 13.04, but even after a clean install it persists. When I use ...
4
votes
2answers
3k views

Why does Ubuntu have about 2x shorter battery life than OS X on MacBook?

Ubuntu 12.04 has about 2x shorter battery life than OS X on my MacBook Pro 2010. What are the technical reasons for this? Is it because OS X uses some hidden firmware features? Can Linux somehow ...
4
votes
1answer
832 views

Freeze when resuming from screensaver or monitor-sleep-state [closed]

I've installed Natty on an older Samsung desktop at work. It's a shared machine that needs no screen-locking, passwords, or anything else. (Perhaps it should have those features, but nobody would use ...
4
votes
4answers
778 views

Squeak after lid close [closed]

I have a strange problem with Ubuntu 10.10 - when I close the laptop lid (Samsung r580) it makes a very high squeak. This doesn't occur on Win7. I am currently using 2.6.35.27 kernel. If you need some ...
4
votes
1answer
268 views

How to send an email when laptop battery is low?

Is it possible to send an email to myself when the laptop is on low battery power? I'm always online with my Android phone, but not always in front of the laptop, and sometimes I'm missing the ...
4
votes
1answer
1k views

Can I stop battery charging at say 80% and switch to AC?

While I was looking for a battery management utility for my Dell E5420, I came to read this post - How can I limit battery charging to 80% capacity? . Sofar, I haven't found one that relates to my ...
4
votes
2answers
5k views

VLC does not inhibit screen blanking

I have an issue which could be a bug, but before reporting it, I want to make sure I'm not doing something wrong. When watching a movie with VLC on fullscreen, approximately in 10 minutes the screen ...
4
votes
3answers
532 views

ACPI 30k+ interrupts per second

My computer is currently doing something like 30k+ interrupts per second. This causes battery issues as well as the CPU being always stuck at the highest speed, making it very hot (overheating.. 75C ...
4
votes
1answer
333 views

Why is kernel “rescheduling” causing so many wakes-from-idle?

PowerTOP reports that the majority of wakeups are being caused by [Rescheduling interrupts], [kernel scheduler], and [kernel core]. What are these, and can I do anything to reduce the number of ...
4
votes
1answer
168 views

What is the power consumption difference between GUI and Shell?

I was wondering if there is any difference in power consumption between regular graphic interface mode and command line shell mode. And if it is what is the difference? Could I use Ubuntu on the ...
4
votes
1answer
276 views

How to automatically slow CPU instead of starting fans?

In Windows' power options, you had the ability to configure your system to use either 'active' or 'passive' cooling schemes. In the 'active' scheme, the fans would start running faster as the CPU got ...
4
votes
1answer
674 views

What causes Dell XPS 13 ProjectSputnik to wake up randomly after suspend and how to fix it?

When I close the lid of my XPS13 the system goes to sleep regularly. Sometimes it stays asleep but some other times it wakes up consuming battery. I can't find the reason why this is happening. Here ...