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The battery indicator in Unity panel not showing up

I've just installed Ubuntu 12.04 on my Acer Aspire 5553. It's the first time I've used Linux for more than 4 years so I don't really know what I'm doing. The installation went almost perfectly; Internet connections and graphics were all configured fine (which is more than I can say for the Windows 7 I've just installed on a dual boot).

However, when I unplug the power supply, there is no battery indicator displayed. In the power settings, there is only one column; I've seen screenshots indicating that I should see two columns, one for "On battery power" and one for "When plugged in". There is also no field "When power is critically low".

I can use the laptop on battery power, but it just keeps running on full power until it suddenly switches off. It seems like the OS doesn't "know" it's on a laptop.

I installed Windows 7 yesterday on dual boot and that configured the power supply perfectly (unlike most of the other hardware).

I reinstalled 12.04 this morning and the problem persists.

The problem is there in both Unity and Gnome.

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marked as duplicate by Jorge Castro, Florian Diesch, Tom Brossman, SirCharlo, John S Gruber Sep 7 '12 at 18:07

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Here is the answer you may be looking for. From the duplicate indicated by Eliah Kagan –  Insperatus Sep 7 '12 at 1:08

1 Answer 1

Install dconf Editor via the terminal:

sudo apt-get install dconf-tools

or using the Software Center:

Install via the software center

Then perform the action indicated in the screenshot below: enter image description here

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Thanks, but this option was already set this way. I think the problem is at a 'lower level'. –  Sam Jul 20 '12 at 15:35

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