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SubjectRe: High pitch noise when ACPI processor module is loaded.


On Mon, 25 Jan 2010, Ian Campbell wrote:

> On Mon, 2010-01-25 at 04:26 -0500, Justin Piszcz wrote:
>> So the question remains, is it possible to utilize turbo boost (in Linux)
>> without the high pitch noise from the ACPI processor module?
>
> I have to use the max_cstate=2 option to processor.ko in order to not
> have a similar high pitch noise. I suppose you might get away higher
> values of max_cstate depending on your hardware. Battery life doesn't
> seem to be too adversely impacted.

Hello,

I tried this, but then the max speed bin is only 3.2GHz instead of 3.6GHz,
it does solve the problem but limits the CPU quite a bit, see below:

CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7
0 3.20 2.93 0.33 99.67 0.00 0.00 0.00 0.00 0.00
1 3.20 2.93 0.09 99.91 0.00 0.00 0.00 0.00 0.00
2 3.20 2.93 100.00 0.00 0.00 0.00 0.00 0.00 0.00
3 3.20 2.93 0.95 99.05 0.00 0.00 0.00 0.00 0.00
4 3.20 2.93 0.08 99.92 0.00 0.00 0.00 0.00 0.00
5 3.20 2.93 0.02 99.98 0.00 0.00 0.00 0.00 0.00
6 3.20 2.93 0.06 99.94 0.00 0.00 0.00 0.00 0.00
7 3.20 2.93 0.01 99.99 0.00 0.00 0.00 0.00 0.00

--

It would be nice if it were possible to find out what is causing it exactly
in the acpi cpufreq module, as this problem does not occur in Windows 7 and
I can achieve 3.6GHz in Windows 7 w/out any high pitch noise.

Justin.



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