* Stuart Prescott <debian@nanonanonano.net> [2005-07-27 18:36:31 +1000]: > Hi JB, > > I can confirm this one with my HP nx7010 (Centrino processor). > > it seems to be something to do with the processor going into sleep modes > to save power. There has been significant discussion on kerneltrap,org > about this recently related to the proposals to change the HZ value in > the kernel. The suggestion has been made that it has to do with poor > quality components (capacitors were blamed, IIRC) in the power supplies > that tend to buzz as the power consumption goes up and down. > > One thing that I have found is that if I increase the load on the > processor or plug in some USB devices (which presumably does the same > thing) then it goes away... > > So if you're feeling like some further experimenting.... does it buzz > under 2.4 kernels? (HZ=100 in 2.4 series). If you feel like recompiling > your kernel, try changing the value for HZ in the headers back to 100 > and see what that does for you. > > I'd quite like to nail this one down too, but I think we need a number > of people with different machines (and lots of time for recompiling > kernels...) to be able to come up with some definitive empirical > understanding of what's going on. (and it seems that kernel hackers > don't use laptops so they've never noticed this) > > cheers > Stuart Hi folks, I use a DELL Inspiron 8200 over here. My laptop makes noise, as well, but if I pull out the battery it is just silent. After pluging it back in, the noise is still gone but will probably come back if the battery is not 100% charged. Regards, Marc
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