I just bought a new laptop last week, Toshiba U500 with a P8600 2.1Ghz. It came 
with Vista, and it had a temperature/fan monitor there. Even while running 
important applications, the fan stays at 50-70% and the CPU doesn't get hot.
However, after I installed Ubuntu 9.04, the fan doesn't work. It stays off for 
like 3 minutes, then turns on for 3 seconds at max speed. And keeps repeating 
this pattern. That happened even during its Live CD version, and installation. 
Once the computer reboots, the fan goes to max. The moment I run Ubuntu, it 
stops. This is 
One other thing to note is that, I tried BACKTRACK, a Slaxware based linux 
distribution. The problem persists, the fan only works 3 seconds each 3 minutes 
there too.

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Ubuntu 9.04 laptop overheat and shutdown
https://bugs.launchpad.net/bugs/370173
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