I have been experiencing this as well.

I just (finally) got ubuntu up on my new x201 yesterday (was running
into the KMS error, before).

Yesterday I used the laptop all day without a problem, I was working
from home so it was just the laptop.

Today I brought it into the office and have experienced 2 or 3 freezes
today. The differences include:

- external display
- external keyboard
- external mouse

I just turned off the visual effects (under appearance) which I guess turns off 
compiz. I'll report back if that helps. 
Would anyone like me to attach any log files or other output?

-- 
X locks up on Thinkpad X201 i5 Laptop
https://bugs.launchpad.net/bugs/575186
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