Questions related to power management, particularly power saving measures.
Questions tagged [power-management]
2802 questions
491
votes
16 answers
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?

badp
- 12,372
103
votes
9 answers
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 button?
I had the same problem with the 11.04…

NaN
- 1,415
102
votes
20 answers
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 using native applications like VLC. With in-browser…

Steven Roose
- 1,928
86
votes
10 answers
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 lid, the ssh server stops working and, I guess,…

WhyWhat
- 999
74
votes
7 answers
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 (as far as I can tell), but once I get past the…

Justin H
- 741
- 1
- 6
- 3
25
votes
6 answers
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 dies.
The proper settings are set in Power…

Kyle Chadha
- 598
- 1
- 5
- 10
24
votes
6 answers
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 frequency as it needs it and this works really well…

Oli
- 293,335
21
votes
2 answers
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 discharge accuracy.
The more you use your laptop,…

drgrog
- 2,867
19
votes
4 answers
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 frequency in 12.04, and how to get and install…

Tim
- 25,177
18
votes
3 answers
How do I measure server power consumption?
Is there a command, or package that can be used to calculate how much power my server is drawing? I am interested in knowing how much my server is costing me to run. I know the calculations of how much it would cost if drawing the full 300 Watts…

Codemwnci
- 1,249
13
votes
3 answers
How can I enable automatic resume on lid open?
My problem is the opposite of what is described in How to prevent resume from sleep/suspend on lid open?.
If I close my laptop's lid, it automatically suspends, but when I open it up again, nothing happens, and I have to press the power button to…
anon
13
votes
5 answers
Alarm clock from suspended mode
I want my laptop to wake up from suspended mode in the morning and alarm me to wake up using my mp3 file.
How do I do it?
I tried apmsleep, but it doesn't work cause my PC doesnt have "suspend to RAM" feature in BIOS. What can I do?
Thanks!

Chelios
- 1,871
- 3
- 16
- 16
13
votes
8 answers
Power Savings and Performance Modes on Ubuntu System
This might be the only thing I miss from windows.
There is no way to tell the system to run in high performance mode or in power saver mode.
May be this feature which is already there and I am not sure.
So, Is there a way to change the system…

Starx
- 5,263
13
votes
5 answers
How to find a program which is preventing sleeping?
I am noticing that recently my laptop does not go to sleep/lockout after its configured X minutes of inactivity like it did in the past. I suspect some program (like media player does) is preventing it from going to sleep. I do not have any media…

Mitar
- 1,892
10
votes
4 answers
Can APC ups wake powered off machine up when AC power is back?
I have used apcupsd under ubuntu to power off my machine when AC power is lost via serial.
Is there any way let the UPS to wake up already powered off machine when AC power is back?
I have tried to enabled everything in BIOS that corresponding to…

c2h2
- 201