High pitch noise when ACPI processor module is loaded.
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From: Justin Piszcz on 23 Jan 2010 10:50 Hi, Linux: When I do not load the ACPI processor module, there is no high pitch noise. When I load the ACPI processor module (so I can utilize Turbo Boost), Linux makes the system emit a high pitch noise. Windows: The same system, running Windows 7 does not emit any noise. Is there something wrong with the ACPI processor module or its implementation on i5/i7 CPUs? Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Rafael J. Wysocki on 23 Jan 2010 15:20 Messages about ACPI should be CCed to linux-acpi(a)vger.kernel.org (added). On Saturday 23 January 2010, Justin Piszcz wrote: > Hi, > > Linux: > When I do not load the ACPI processor module, there is no high pitch > noise. When I load the ACPI processor module (so I can utilize Turbo > Boost), Linux makes the system emit a high pitch noise. > > Windows: > The same system, running Windows 7 does not emit any noise. > > Is there something wrong with the ACPI processor module or its > implementation on i5/i7 CPUs? > > Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Robert Hancock on 23 Jan 2010 15:50 On 01/23/2010 02:12 PM, Rafael J. Wysocki wrote: > Messages about ACPI should be CCed to linux-acpi(a)vger.kernel.org (added). > > On Saturday 23 January 2010, Justin Piszcz wrote: >> Hi, >> >> Linux: >> When I do not load the ACPI processor module, there is no high pitch >> noise. When I load the ACPI processor module (so I can utilize Turbo >> Boost), Linux makes the system emit a high pitch noise. >> >> Windows: >> The same system, running Windows 7 does not emit any noise. >> >> Is there something wrong with the ACPI processor module or its >> implementation on i5/i7 CPUs? May not be anything "wrong", but some systems do have an issue with the voltage regulator circuitry where it can make noise with certain combinations of power draw and wakeup rates (causing rapid current draw fluctuations) where some of the components can resonate and make noise. What does powertop report for this system? It might show some useful info. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Valdis.Kletnieks on 25 Jan 2010 00:40 On Sat, 23 Jan 2010 10:48:50 EST, Justin Piszcz said: > Hi, > > Linux: > When I do not load the ACPI processor module, there is no high pitch > noise. When I load the ACPI processor module (so I can utilize Turbo > Boost), Linux makes the system emit a high pitch noise. Sounds like singing capacitors. http://lwn.net/Articles/145973/ - and see the last 2 comments.
From: Justin Piszcz on 25 Jan 2010 04:30
On Mon, 25 Jan 2010, Valdis.Kletnieks(a)vt.edu wrote: > On Sat, 23 Jan 2010 10:48:50 EST, Justin Piszcz said: >> Hi, >> >> Linux: >> When I do not load the ACPI processor module, there is no high pitch >> noise. When I load the ACPI processor module (so I can utilize Turbo >> Boost), Linux makes the system emit a high pitch noise. > > Sounds like singing capacitors. > > http://lwn.net/Articles/145973/ - and see the last 2 comments. > > > Hi, I think something else may be wrong? I switched my kernel config to 100 HZ and the problem persists. So the question remains, is it possible to utilize turbo boost (in Linux) without the high pitch noise from the ACPI processor module? Again, when the module is not loaded, no matter what HZ, there is no high pitch noise. Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |