Messages in this thread | | | Date | Mon, 25 Jan 2010 15:46:06 -0500 (EST) | From | Justin Piszcz <> | Subject | Re: High pitch noise when ACPI processor module is loaded. |
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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
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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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