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I accidentally clicked on the option "When power is critically low" under System Settings>Power. The original entry was blank, but the only two options after I clicked were Hibernate and Shutdown. I want to set it back to Suspend.

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Which version of Ubuntu are you using? –  Anderson Green Jul 30 '12 at 17:01

2 Answers 2

up vote 5 down vote accepted

There is no option to suspend available.

You cannot suspend when power is critically low, to suspend you need power to save the session to RAM allowing you to resume quicker, if you loose power you loose the current suspend state.

Hibernate copys the current state to the hard drive, it is slower but you can turn off the power.

Shutdown is obvious - you will loose any data in the active session and have a new session on restart.

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In an ideal world, maybe. I would LOVE it if I could configure my machine to suspend when it falls below e.g. 15% of the battery (easily enough for several hours in suspend) because as it is, I can only configure it to shutdown (which kind of guarantees you lose data) or hibernate (which is completely broken on my machine). So here's to unnecessary constraints... –  Tomislav Nakic-Alfirevic Jun 20 '12 at 21:02
    
I am facing the same problem. It used to suspend when battery is critically low. But as in the question, I accidentally clicked on the option "When power is critically low" under System Settings>Power. The original entry was blank but now I can only select 'Power Off'. Hence, my computer shutdowns when battery is critically low. I would like to make it suspend in that case. Don't know how to get back to the original state where it used to suspend. –  Mukesh Chapagain Aug 23 '12 at 4:40
    
In Ubuntu 12.04, the "hibernate" option is disabled, and the computer restarts instead of suspending when the battery is critically low. –  Anderson Green Oct 3 '12 at 18:04
    
@chapagain I am facing exactly the same problem. Which version of Ubuntu are you using? –  Anderson Green Oct 3 '12 at 18:18
    
@AndersonGreen I am using Ubuntu 12.04 –  Mukesh Chapagain Oct 3 '12 at 19:23

To change this setting back to suspend, use dconf-editor. Go to org.gnome.settings-daemon.plugins.power and change critical-battery-action to suspend.

Alternatively, in a terminal session use the command:

gsettings set org.gnome.settings-daemon.plugins.power critical-battery-action 'suspend'

The gsettings command is resident by default while dconf-editor requires installing via:

sudo apt-get install dconf-tools
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