In this Image (output of
On the top, just below radeon-pci-0100, it says
temperature +511 Deg C, does this really mean 511, will this not blow up my laptop?
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Your computer does seem to be overheating, you are past the high and close to the critical values for some of your cores. You should try cleaning it out or switching governors.
Now, as for the 511 degrees I am pretty sure that if your computer were actually that hot you would know it, that is more than twice as hot as an oven. Unless you can fry eggs on your keyboard this is most likely a malfunctioning sensor somewhere.
So, no, the 511 is probably not real but you nevertheless probably have a serious heating problem.