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I am using Ubuntu for a quite long time now. I am concern about laptop getting hot. So i would like to know is it safe to have ACPI temperature 90 C ? Or it could damage my laptop ?

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What specific processor do you have? can you check? It's available on the system-monitor application, under the 'system' tab. Copy and paste the line for the processor. –  balloons Feb 15 '12 at 17:01
    
Well that's not normal I'd guess the threshold is something like 120°C but that's too Much, have take a look at the questions on the right side of the site?. –  Uri Herrera Feb 15 '12 at 17:03
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i live in very hot country ... my i3 laptop have never gone to above 65 C .... Over Heating may damage your laptop but before over heating its automatically shuts down ... u need to check the fan is it working properly , may be dust in fan can make slow down the fan –  One Zero Feb 15 '12 at 17:10
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2 Answers

ACPI temperature is most likely your motherboard temperature - not the CPU. Mobile CPUs temp limit is usually little above 100C - depending on CPU type. Example i5 spec - see Tjuntion temperature. I would say that 90C ACPI temp is bit too high unless under heavy load like gaming. If the temp is at the level all the time I would suggest getting your laptop serviced or cleanning it up by yourself if you know how.

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It's not dangerous really as like others have said the PC will automatically power off if it gets too hot. Just make sure to backup and save regularly and maybe think about cleaning the fan. Another thing is to check your HDD life using one of the many tools out there as when I had this problem of high temperatures and overheating it turned out the HDD was near the end of it's life and this puts more strain on other components.

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