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I've read about a bug in the first versions of kernel 2.6.35 that causes the temperature to increase above the normal. Does anyone knows if it is already corrected?

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It seems there is a bug in the kernel, according to this lauchpad bug. People are seeing this a lot, although they say the temperature feels the same. It is probably a bug that should be fixed soon. You don't have to worry about it. If you update your ubuntu installation a feel the machine is getting hotter, not just what is said by the lm sensors, than you could downgrade the kernel to a "safer" version.

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You may be talking about this issue:

The takeaway is that it may just be a change in how the temperature is reported, not an actual change in how hot the system is. To test if this is so, see if the output of:

cat /sys/devices/platform/coretemp*/temp1_crit

has changed from 10.04 to 10.10. If so, your system will report hotter temperatures, but it will not actually be running hotter.

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