Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am doing CPU-intensive work on my Thinkpad X220 laptop and I find the performance bad. Interestingly, the CPU becomes more powerful if I disconnect the AC power and run only on battery! It does slow down after a while though, probably because the CPU gets too hot.

Still I find the CPU too slow and I need to increase its performance somehow. I installed jupiter manager, but setting cpu to maximum performance from it did not change anything.

share|improve this question

I had the same problem when I bought an extra power supply for my laptop (for my bag) Turns out that some 'replacement' power supplies have a lower max watage and the computer senses that and then throttles the CPU. In my case, on battery=full speed, original adapter=full speed, new adapter=throttled.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.