From: Bill Davidsen <davidsen@tmr.com>
To: linux-kernel@vger.kernel.org
Subject: Re: speedstep-centrino on dothan
Date: Wed, 06 Jul 2005 15:58:53 -0400 [thread overview]
Message-ID: <42CC37FD.5040708@tmr.com> (raw)
In-Reply-To: <20050706112202.33d63d4d@horst.morte.male>
st3@riseup.net wrote:
> Currently, the speedstep-centrino support has built-in frequency/voltage
> pairs only for Banias CPUs. For Dothan CPUs, these tables are read from
> BIOS ACPI.
>
> But ACPI encoding may not be available or not reliable, so why shouldn't we
> provide built-in tables for Dothan CPUs, too? Intel has released this
> datasheet:
>
> http://www.intel.com/design/mobile/datashts/302189.htm
>
> with frequency/voltage pairs for every version of Dothan CPUs.
>
> Moreover, I checked on Pentium M 725 and Pentium M 715 that the lowest
> frequency at which the CPU can be set safely is not the 600MHz given in
> datasheets, but 400MHz instead, with VID#A, VID#B, VID#C and VID#D (see
> datasheet for more details) set to 0.908V.
>
> I can provide a patch, let me know.
Slower is better, and not depending on ACPI for anything which can be
gotten elsewhere is a good thing. Sounds like a good idea to me.
next prev parent reply other threads:[~2005-07-06 20:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-06 9:22 speedstep-centrino on dothan st3
2005-07-06 14:06 ` Dominik Brodowski
2005-07-06 19:45 ` st3
2005-07-06 16:30 ` Pedro Ramalhais
2005-07-06 19:58 ` Bill Davidsen [this message]
2005-07-06 21:11 ` Dave Jones
2005-07-06 21:55 ` st3
2005-07-07 20:00 ` enhanced intel speedstep feature was " st3
2005-07-07 20:06 ` Dave Jones
2005-07-07 20:22 ` st3
2005-07-07 20:40 ` Dave Jones
2005-07-07 20:51 ` Joseph Pingenot
2005-07-07 21:08 ` Dominik Brodowski
2005-07-07 21:34 ` Joseph Pingenot
2005-07-07 21:51 ` Dominik Brodowski
2005-07-07 21:10 ` Dominik Brodowski
2005-07-07 21:22 ` st3
2005-07-07 21:29 ` Dominik Brodowski
2005-07-07 21:59 ` st3
2005-07-08 5:10 ` Dominik Brodowski
2005-07-08 8:58 ` st3
2005-07-08 10:59 ` Nikolay Pelov
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