ThinkPad X220 Overheating

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http://ubuntuforums.org – Hi, I'm guessing this is the right place to post for a noob like me :) I was running Ubuntu 12.04 on my ThinkPad x220 for ages with no problems, then ever since I updated to 13.04 I have been experiencing overheating problems. The fan is also going flat out, even when the machine is idle. This doesn't happen when I run Windows 7 so pretty sure it isn't a hardware problem. Aside from draining the battery, kind of worried about what damage will be caused by running my laptop so hot all the time. Does anyone have a solution for this? (Hardware)