Date: Fri, 30 Sep 2005 09:25:44 -0400
From: Dave Jones <davej@redhat.com>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: Wes Felter <wesley@felter.org>, linux-kernel@vger.kernel.org
Subject: Re: em64t speedstep technology not supported in kernel yet?
Message-ID: <20050930132544.GC15658@redhat.com>
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	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	Wes Felter <wesley@felter.org>, linux-kernel@vger.kernel.org
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On Fri, Sep 30, 2005 at 06:20:15AM -0700, Pallipadi, Venkatesh wrote:

 > Actually, speedstep-centrino works in two modes. One OP() 
 > table based mode and the other ACPI table based mode. So, 
 > BIOS ACPI tables do matter for the second mode and things 
 > work without a static OP table.

True. Ack, I've spent too much time playing with that driver
and broken BIOS's lately, that I'd forgotten about this. :)

 > In this particular case though, for Xeon with Enhanced Speedstep, 
 > acpi-cpufreq should be the driver of choice as there is a need 
 > for coordination of HT siblings, which happen in BIOS at the 
 > moment with most BIOSes. That is the reason, I want to make 
 > sure BIOS supports Enhanced Speedstep in this case.

Ok, that makes sense.

		Dave

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