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I just bought a new laptop - SAMSUNG Series 3 NP350V5C-T01US, installed ubuntu 12.10. Everything is ok, except a very annoying sound produced by the fan. If it would be just a constant sound, I mean the same sound all the time, it would be acceptable. But I hear a raising and lowering sound, it seems the speed of the fan is bigger and lower, bigger and lower. The cycle is several seconds. So annoying...

I have tried an opensource video driver, proprietary drivers (stable and beta). Any thought, guys?

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Please add some detail: Is it the same when unplugged from mains? Have you tweaked something at the BIOS settings? nVidia or AMD? Advertised as Hybrid? CPU type? – aquaherd Feb 6 '13 at 8:32
My laptop model says that it is hybrid, AMD, i7. – g3n1uss Feb 7 '13 at 10:07

It took some time to stabilize the fan's behavior. Now no more weird sound, I think the original reason was an opensource driver of my discrete video adapter.

So probable solutions: 1) turn off the discrete video adapter; 2) install the latest proprietary driver.

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