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This is something that I've been seeing on older ubuntu versions, too. I bought a new laptop recently and am seeing the same old thing.

It's Asus K53S with i7 2670QM processor, 8G ram and a somewhat slow HDD (5400rpm). While surfing the web with ~5 tabs, on windows, my core temp is on avg ~51C, and on ubuntu it stays at ~56C.

When installing new software etc it gets higher, but I guess it's something to be expected.

Any ideas why the difference and can I somehow lower it (without undervolting)?

Thanks

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You can use jupiter, it lowered my cpu temperature significantly. Plus you should check threads in askubuntu, similar question was asked before. –  Vinit Jul 27 '12 at 8:18
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2 Answers 2

up vote 1 down vote accepted

Well, it could be that the kernel isn't doing a great job at powering down devices when it could, or it could be that you have some busy applications that are keeping the machine from being idle.

Consider looking at: https://wiki.ubuntu.com/Kernel/PowerManagement/IdentifyingIssues

and also:

https://wiki.ubuntu.com/Kernel/PowerManagement/PowerSavingTweaks

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thx... 3am here, but i'll check it out tomorrow. appreciate your answer, very much! –  playcat Jul 28 '12 at 1:02
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This seems to be a constant annoyance with Linux laptops. The manufacturers pretty much DGAF when it comes to optimizing their stuff for Linuxes.

Things that I found to work quite well:

1 If your laptop is an older one disassemble it and clean it out. Usually there is a crapload of dust accumulated in the air vents which will cause the coolant to try and spin quicker using more electricity and this causes the processor to be constantly waken up for whatever reason.

2 Install cpufreq-utils if you don't have it already installed. Set it to ondemand, that's what windows uses by default. This lowers the frequency of your cpu when it's not needed and increases it when it is needed.

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