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I wanted to ask if this is normal:

Cpu(s): 6.3%us, 0.9%sy, 0.0%ni, 92.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

I typed "top" and got this result, I realise that only 1-2 cores are really working...

And my laptop gets hot of course...

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – bodhi.zazen Jun 12 '12 at 20:10
up vote 1 down vote accepted

I had a similar problem, but it was related with the discrete nvidia video card: it was always on, which was warming the whole system. Did you check that issue?

Correct me if I'm wrong, but that 6% of processor use, can be due to the wrong use of your video card settings

If you have an nvidia card, you can check the documentation of the 'bumblebee' project here:

For other cards, check this link:

Hope it helps!

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