linux-kernel - RE: speedstep-centrino broke

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Message-ID: <EB12A50964762B4D8111D55B764A8454988ACA@scsmsx413.amr.corp.intel.com>
Date:	Thu, 14 Sep 2006 12:43:12 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Almonas Petrasevicius" <draugaz@...das.soften.ktu.lt>,
	"Ben B" <kernel@...cactii.net>
Cc:	<linux-kernel@...r.kernel.org>, <davej@...emonkey.org.uk>
Subject: RE: speedstep-centrino broke

 

>-----Original Message-----
>From: Almonas Petrasevicius [mailto:draugaz@...das.soften.ktu.lt] 
>Sent: Thursday, September 14, 2006 12:43 PM
>To: Ben B
>Cc: linux-kernel@...r.kernel.org; Pallipadi, Venkatesh; 
>davej@...emonkey.org.uk
>Subject: Re: speedstep-centrino broke
>
>
>On Thu, 14 Sep 2006, Ben B wrote:
>
>>> I did verify both kernels 2.6.16 and 2.6.17 (both vanilla), there is
>>> _no_ difference, both have the same speedstep problem.
>>
>> At the suggestion of Venki, I opened a bugzilla ticket on it:
>>
>> http://bugzilla.kernel.org/show_bug.cgi?id=7157
>>
>> And the lowdown is that it seems the newer BIOS no longer exports the
>> correct ACPI symbols which are required for speedstep, thus no longer
>> supporting it (at least via the official methods). Hence it 
>seems not a
>> Linux kernel bug.
>
>Could be. But I am still somehow puzzled, since neither of the 
>previous versions (F04 & F06 in my case) contain any reference to the 
>mentioned methods (_PSS & _PCT). But those versions were 
>speedsteping just 
>fine. 
>Or maybe I don't know how to look.
>Could You dump your "working" ACPI table and look for those 
>two methods?

As you mentioned in your earlier mail, CpuPm object is missing after
BIOS update. That table, most probably, will contain these ACPI _PSS etc
methods internally.

Thanks,
Venki
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