linux-kernel - Re: speedstep-centrino broke

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Date:	Thu, 14 Sep 2006 16:22:42 +0200
From:	Ben B <kernel@...cactii.net>
To:	Almonas Petrasevicius <draugaz@...das.soften.ktu.lt>
Cc:	linux-kernel@...r.kernel.org, venkatesh.pallipadi@...el.com,
	davej@...emonkey.org.uk
Subject: Re: speedstep-centrino broke

Almonas Petrasevicius <draugaz@...das.soften.ktu.lt> uttered the following thing:
> Hi,
> 
> I experience the same speedstep problem on my HP nc6320 (CoreDuo T2400) 
> since yesterday's BIOS update (F06 to F08).
> 
> According to the release notes this BIOS update should introduce support 
> for the new CPU's (Core2 "Merom" I suppose).
> 
> 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.

I opened a support ticket with HP, hopefully they address the issue. In
the meantime I rolled back my bios and have cpufreq working again.
Interesting that you also see the problem on an nc6320, it could be that
they use the same BIOS codebase for various models.

Ben

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