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Ubuntu 12.04 on my laptop uses more than 50 percents of each core even if nothing is running. I have checked from system monitor and from htop, both of them show that each of 4 CPUs percentage is above 50 percents. I have run sensors to check the temperature these are results when only firefox is running:

acpitz-virtual-0 Adapter: Virtual device temp1: +80.0°C (crit = +108.0°C)

asus-isa-0000 Adapter: ISA adapter temp1: +80.0°C

coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +82.0°C (high = +86.0°C, crit = +100.0°C) Core 0: +82.0°C (high = +86.0°C, crit = +100.0°C) Core 1: +74.0°C (high = +86.0°C, crit = +100.0°C)

What can be problem?

EDIT: My Laptop: ASUS U36SD RX167V Intel Core i7-2620M 8GB RAM Nvidia Geforce GT520M

Bumblebee did not help

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Post your specs in the question. –  VedVals Nov 29 '12 at 2:57
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2 Answers 2

The problem might be your graphics card consuming more power. I had a similar problem and I installed Bumblebee. Now I get approx. 2 hrs. of battery life and 65°C temp.(on prolonged use).

Bumblebee's site

Also take a look at this : How do I enable/disable graphics card at will without logging out?

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there are three links that saved me (all together!) :)

for graphic card problems (i had an ATI Radeon): http://techhamlet.com/2012/05/ubuntu-how-to-fix-over-heating-of-laptops-with-switchable-graphics/

as a power management utility: installed jupiter with the following terminal commands:

sudo add-apt-repository ppa:webupd8team/jupiter
sudo apt-get update
sudo apt-get install jupiter

for updates:

http://ubuntuforums.org/showthread.php?t=2006241

these info all together made my laptop go back to normal temperatures.

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the repository of jupiter not right. it provide error by add-apt-repository?! Any other links or repositories? –  shgnInc Dec 11 '13 at 6:49
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