Questions related to power management, particularly power saving measures.

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287
votes
8answers
228k views

How to enable hibernation?

In Ubuntu 12.04 and newer, hibernation has been disabled by default in policykit. How can I enable this back?
114
votes
22answers
83k views

Tips to extend battery life for laptops and notebooks

This question is present as a matter of historical interest. While you are encouraged to help maintain its answers, please understand that "big list" questions are not generally allowed on Ask ...
88
votes
4answers
70k views

Is there a power saving application similar to Jupiter?

I have installed the 13.04 final release and so far I am loving it more 12.10. I'm trying to install the Jupiter power settings app but, I read it is no longer compatible with the new kernel. Is there ...
81
votes
10answers
59k views

How can I tell Ubuntu to do nothing when I close my laptop lid?

I would like closing the laptop lid to be a no-op. How can I do that?
49
votes
7answers
59k views

How do I modify the options for the power button?

When I press the power button a dialog opens, but I want to shutdown the system without receiving "Do you really really want to shutdown?". How can I choose a direct shutdown action on a pressed power ...
46
votes
3answers
120k views

How to control fan speed?

How can I control fan speed? On windows there is wonderful program called speedfan.
45
votes
14answers
37k views

How to prevent my screen from either dimming or the screen-lock starting when watching YouTube?

My screen brightness used to dim after a few seconds to preserve battery. This is default in Ubuntu 12.04. However when watching video it should not dim. This works correctly when I watch videos ...
37
votes
4answers
21k views

Hibernation is still missing from menu in 13.10 after enabling via polkit. How to enable?

I know that since 12.04, we need to add a policykit rule to enable hibernation (see question How to enable hibernation? and the Official Documentation). I can successfully bring my laptop into ...
37
votes
2answers
1k views

How to get the “Your battery is broken” message to go away?

Everytime I turn on my computer, I see a message saying something like: Your battery may be old or broken. Etc... I know my battery is not working. How can I make the message go away?
32
votes
3answers
89k views

Shutdown does not power off computer

I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520. I encounter a problem whenever I shutdown or restart; it kills all running processes ...
31
votes
1answer
22k views

Is “laptop-mode-tools” still relevant for 12.04 and the 3.x kernels?

I'm using Ubuntu 12.04 x64 and trying to choose power management software. Laptop-mode-tools have a lot of features, but the only reason why I'm worry about is that it's manual and config files are ...
29
votes
5answers
18k views

Why does my computer get less battery life with Ubuntu compared to Windows?

Last year I purchased a Dell Inspiron 5315 laptop shipping with Windows 7 preinstalled. I installed Ubuntu 10.10 alongside it with dual-booting. On upgrading to Ubuntu 11.10, I was upset to find I now ...
25
votes
6answers
45k views

How do I completely turn off screensaver and power-management?

I looking for a method to turn-off the screensaver and powermanager but from the command line. I'm aware this can be done via the GUI screen - but can this be done via the command line or via some ...
23
votes
5answers
7k views

How to go automatically from Suspend into Hibernate?

Is it possible to make Ubuntu go into Hibernate state from Suspend, aka "Suspend Sedation"? For example, my laptop is set up to go into a Suspend once I close the lid. If then I don't use it for ...
22
votes
6answers
2k views

Forcibly underclocking at night

My desktop stays on all the time. It acts as a server and also performs other semi-essential household tasks. During the day it uses the OnDemand CPU setting. This essentially just scales the CPU ...
20
votes
3answers
7k views

How do I disable the sleep button on my keyboard?

I have a "power button" on my keyboard that enables standby or hibernate. I can't find the mapping of this key anywhere in "sytem settings>Keyboard", "system>power management", "compiz config> or ...
19
votes
5answers
35k views

How can I control HDD spin down time?

I have 2 HDDs in my PC. Ubuntu is turning off the secondary HDD very quickly after about 15 minutes, which is short for me. I need to control this time. How can I do it? I tried GNOME power ...
18
votes
2answers
12k views

Ubuntu Server 13.10 now goes to sleep when closing laptop lid

I recently upgraded to the latest version (13.10). I have it running on an old laptop. Since the upgrade, whenever I close the laptop lid, it goes to sleep mode. Any idea on how to fix? I've ...
17
votes
4answers
52k views

CPU frequency scaling for 12.04?

In 10.10, I remember I had CPU Frequency Scaling Monitor by default. Now in 12.04, I cannot find anything similar in Ubuntu software center. I wonder what applications are recommended for scaling CPU ...
17
votes
4answers
22k views

Ubuntu 12.10 “Turn screen off when inactive for: Never” still turns off

After a fresh install of Ubuntu 12.10, my screen still goes off after about ten minutes. I've been to the Brightness and Lock control panel. The Turn screen off when inactive for: setting is set to ...
17
votes
0answers
10k views

Battery life decreased after upgrade to 11.04 [duplicate]

Possible Duplicate: Why does my computer get less battery life with Ubuntu compared to Windows? After upgrading from Ubuntu 10.10, my battery life has decreased dramatically. There was a ...
15
votes
7answers
16k views

Laptop minimal power consumption tweaks [duplicate]

I've recently installed Ubuntu 11.10 on a new Lenovo X220 laptop with a 9-cells battery. I have a trans-atlantic flight coming up, and I would like to use my laptop during it. Lenovo claims that ...
15
votes
6answers
2k views

How can I optimize Ubuntu for minimal energy usage?

How can I optimize Ubuntu for minimal energy usage? I use my laptop for development, but also for writing. I have a 9 hour flight coming up and a 6 hour battery life when already using limited ...
14
votes
6answers
17k views

How to save brightness settings?

After I upgraded my notebook to ubuntu 12.04, I found that I can not save my power settings. Every time I set the screen brightness to 70%, it restored to 100% next time. I can't find a save button on ...
14
votes
3answers
3k views

How to turn off the display via the command line?

Is there a way to turn off the display (enter power saving mode) using a command? For example, when the computer is inactive for a specific interval, the screen turns off to conserve energy. Is there ...
14
votes
1answer
2k views

Is there ongoing work in the kernel team to improve battery life under linux?

I have read in some forums that the kernel team is working on improving battery life and energy efficiency in linux. Unfortunately our community really lags behind windows and mac in that regard. I ...
12
votes
3answers
6k views

Will final version of 12.04 use the power management changes found in kernel 3.3

I have seen in some version of Ubuntu that instead of making a huge change to update to the latest kernel, they take some of the good stuff out of it, for the sake of stability and put it on a ...
12
votes
1answer
5k views

How to change critically low battery value?

I would like my laptop to hibernate itself when the battery level is 10% to be sure it has enough power to complete the operation properly. Actually if I don't pay attention my laptop informs me it ...
12
votes
2answers
20k views

How do I monitor power consumption?

The powertop program shows the power usage, but only after about five minutes. Before that, it shows: no ACPI power usage estimate available That's one of the limitations of the powertop ...
12
votes
2answers
2k views

Why does powertop still detect tunable settings on >12.04?

According to this Q&A laptop-mode-tools and powertop are not needed anymore with ubuntu 12.04 as the power savings are now included in the kernel. So I decided to remove laptop-mode-tools from ...
12
votes
2answers
8k views

How to charge the battery till 60-80% only?

I just got my laptop's battery replaced and read a bit about how to prolong it's life. Most people say that the best choice is not to charge it will 100%, but rather to 60-80%. My battery is quite ...
11
votes
1answer
8k views

How can I workaround the XFCE4 power manager being broken?

I just did a clean install of 12.04 on my netbook, then installed xubuntu-desktop. (The reason for that is the showstopper bugs in 11.10 Unity -- like menus not working, or the launch bar capturing ...
11
votes
3answers
2k views

Stop laptop from suspending when closing lid in lightdm

How do I stop my laptop from suspending when closing the lid under lightdm - the power management settings in xfce or gnome 3 does not seem to apply when the window manager is not running.
11
votes
3answers
351 views

Is running temperature considered when a machine is added to the 'Ubuntu certified' list?

I have a 2 yr old HP pavillion dv4 laptop. Ubuntu runs fine. But I recently noticed that the temperature of the cores (with just a browser open, not playing flash videos) is significantly higher than ...
10
votes
9answers
16k views

How can I hibernate from GNOME Shell?

GNOME Shell doesn't have an option to hibernate in the session menu. I checked the GNOME Shell Cheat Sheet but hibernate is not mentioned there. How can I hibernate my machine from within a GNOME ...
10
votes
6answers
19k views

Scheduling StartUp and ShutDown

I use Torrents often, so I need to know how to make my computer start up and shut down automatically, Wi-Fi is switched on at six in the morning in my hotel and switched off at two AM. (I am able to ...
10
votes
2answers
4k views

How can I get the percentage of my battery life from the command line?

This question tells me how I can find the state of my battery from the command line. While this is useful information sometimes I need something quicker, basically like the percentage or enough for ...
10
votes
2answers
3k views

Maximum CPU frequency stuck at low value

I have observed a problem with Ubuntu 13.04. The problem was not there on 11.10 I used earlier. The maximum CPU frequency is stuck at 2GHzon my Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz (Dell Lattitude ...
10
votes
2answers
7k views

How do I check if last shutdown was clean?

How can tell that my last shutdown was properly done in Ubuntu 11.10 or if the machine was powered off before shutting down the OS?
10
votes
4answers
35k views

How do I disable my system from going to sleep?

I am getting a web server setup at home on an older AMD 2400+ desktop. I have Ubuntu 11.04 installed and running however, after a time, I can no longer browse to the server. When I go to the keyboard ...
10
votes
2answers
3k views

Does Ubuntu Touch consume less power than Android? [closed]

One of the problems of new OSs is power consumption. That is because power and performance requires a lot of tweaks and experience with the kernel, drivers and OS code-base on one hand, and a lot of ...
10
votes
4answers
2k views

Cutting desktop power usage

I'm on a general energy saving mission. I've finally swapped my old CRT monitor for a LCD, so the next step it to optimise the PC power usage. It's using an AMD 64 X2 4600+ CPU which I know can ...
10
votes
0answers
4k views

Battery drain on ubuntu is fast [duplicate]

My battery drain on win7 is less than that of ubuntu (around 45 min of difference). Can you advice me something to get best battery performance on my laptop? when I decrease the brightness it remains ...
9
votes
4answers
5k views

Netbook performs hard shutdown without warning on low battery power

My Asus EEE netbook performs a hard shutdown when it reaches low battery power, without giving any warning - i.e. the power just goes off, without any shutdown process. I can't find anything in the ...
9
votes
6answers
3k views

How can I disable backlight when I lock the screen?

When I lock screen, the display does turn black but the display isn't completely off. There is some light coming out of the display in screen lock mode but it get turned off when inactive for 10 ...
9
votes
3answers
3k views

Kernel patch that solves battery issues when for ubuntu ? [closed]

http://www.phoronix.com/scan.php?page=news_item&px=MTAxNDM When will this come for ubuntu ? I am getting tired with my 11.10 dieing at little over 50 minutes of battery when at the most extreme ...
9
votes
1answer
411 views

How to control LightDM power saving preferences?

I want lightdm to enter power save after a specific period of time. If I'm logged in then my screen will time out as per the user settings, however when no one is logged in the screen will stay on ...
8
votes
1answer
4k views

How can I set my system to suspend when inactive to a longer amount of time

I run Mythtv on some Ubuntu 11.10 based machines. In the power settings, I can choose from a list of time periods from 5 minutes up to 1 hour for the the machine to suspend when inactive. I would ...
8
votes
2answers
1k views

Where does gnome-power-statistics get its data from?

Gnome-power-statistics is run when you click on the battery icon in the top panel of a laptop. It shows battery history such as charge and rate, as well as statistics such as discharge profile and ...
8
votes
3answers
9k views

How do I prevent an external monitor from shutting off when closing my laptop lid?

I've seen this issue on previous versions of Ubuntu, but not on 12.04 and some of those are resolved bugs, so I'm asking again. I've set up power management so that, when plugged in, my laptop does ...