Questions related to power management, particularly power saving measures.

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6
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2answers
2k views

How to prevent battery from charging while on UPS

I'm running on UPS power and would like to prevent the laptop's battery from charging, to increase the amount of power available to other devices. Is there a way to do this? update The machine is a ...
6
votes
1answer
536 views

How do I prevent immediate wake up from suspend (version II)?

This question covers one reason a computer might immediately wake after suspend: How do I prevent immediate wake up from suspend? I seem to have a different one. After a recent security patch update ...
6
votes
2answers
2k views

Is it possible to turn the video card off in a laptop to use it as a headless server?

Since I recently upgraded my IT infrastructure, I decided to use my old laptop as a home server. The problem is that the machine sports a powerful nVidia card that even at idle generates enough heat ...
6
votes
3answers
841 views

laptop-mode-tools and harddrive spinoff

So I wanted to extend my laptop battery life. After googleing a lot I found many tips and tricks. Some even in this site as well. Then I found this package in synaptic as well laptop-mode-tools. Now I ...
6
votes
0answers
1k views

Can not estimate remaining battery time? [duplicate]

Possible Duplicate: Laptop's battery is stuck on “estimating”? After updating to Ubuntu 10.10 from 10.04 Ubuntu can not estimate both the battery time and the percentage ...
5
votes
5answers
9k views

Is Ubuntu Battery Management Better Than Windows?

Is Ubuntu battery management better than Windows ? I have noticed that in Windows 7 a fully charged battery shows 3:30 minutes but in Ubuntu it shows 2:00 hours ... !!! so what is the power ...
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

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. ...
5
votes
5answers
8k 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 ...
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
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
6k 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 ...
5
votes
2answers
13k 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
516 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
4k 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
95 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
574 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
1answer
2k views

How do I enable power management on Ubuntu Server?

I have Ubuntu Server 11.04 installed on an old noisy laptop. Its only purpose is to run subversion and I commit code quite rarely, but the laptop should work all the time. So I would like to know how ...
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
1answer
840 views

Laptop shuts down upon waking from suspend

The computer enters suspend either by closing lid, choosing suspend from the top-right drop down, or hitting the power button and pressing suspend. It doesn't matter. I then attempt to wake 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
775 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
1k views

How to shutdown Ubuntu after (2 hours) of idle?

Running: Xubuntu 14.04 32bit. I have read several outdated, not working, working different that I want answers here and elsewhere. I had a script that resulted in shutting my Laptop down at boot time ...
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
2answers
539 views

How do I detect when my system wakes up from suspend via DBus or similar in a python app?

In a background Python script I need to detect, when the system just woke up from suspend. What is a good way that does not rely on a root script but rather on python modules such as DBus? I'm new to ...
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
votes
2answers
226 views

How to get a notification when computer is not charging?

My laptop battery sucks, and lasts up to 5minutes without charging. Sometimes the charger falls out without me knowing, making the computer shut off unexpectedly. Is there a way to get a notification ...
4
votes
2answers
898 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
6k 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
882 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
902 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
1answer
491 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
5answers
11k 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
1answer
85 views

Prevent machine from sleeping when SSH connections are on

I am trying to save power by switching desktops to suspend mode when they are inactive. But many desktops are also accessed via SSH by their owners. There is a wakeonlan solution deployed to enable ...
4
votes
3answers
17k 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
129 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
1answer
445 views

Is there a way (hack) to enable Screen Lock but NOT to Lock on lid close?

Here's exactly what I wanted to do: Turn ON Lock (Settings > Brightness and Lock), set the time to wait (Lock screen after:), BUT NOT to lock the screen (e.g. no Password prompt) if I'd only close ...
4
votes
2answers
110 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
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
5k 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
1answer
3k views

My fan is always on but not in MSWindows (HP elitebook 8460p)

Problem: My laptop(new) fan is ALWAYS on. Question: What can I do to solve this issue? Situation: HP Elitebook 8460p Ubuntu 12.04 LTS (clean install, no mod, nothing... really clean... no ...
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
925 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
808 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 ...