Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

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 running Ubuntu 10.10 since I thought the upgrade was safely possible on my working machine (programmer here). I recently got a freeze now and then, but slowly it got really annoying, when it went from once in a while to once a day. So I googled around for potential causes and re-installed the graphic driver (ATI Radeon HD 4300).

After this, I suddenly only have one core left - there should be 4, since I have an i5!

When I run Ubuntu from a live-CD everything is fine - so it is not a hardware problem...

Any ideas, what I can do without re-installing?

Per request:

model name: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
share|improve this question
Can you append the output of cat /proc/cpuinfo | grep name to your post, please? – Oli Apr 7 '11 at 14:29
You need to be more specific. What makes you say you only have one core? – psusi Apr 7 '11 at 14:48
@psusi The command asked them to run should have returned 4 lines, one for each core. Something is awry. – Oli Apr 7 '11 at 15:04
Okay how about the output of dmesg | grep -i cpu? – Oli Apr 7 '11 at 15:10
How about uname -a? Does it show SMP? – Egil Apr 7 '11 at 17:12

What I did to rescue my computer: I used synaptic package admin and set the fglrx to re-install. Then I added this line to my grub:


I rebooted and nothing happened. Then I executed


And THEN it worked! :)

Thanks for adding your ideas!

share|improve this answer

Your Answer


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