Re: Pentium-M - not recognized?

From: Eric Anderson <anderson_at_centtech.com>
Date: Fri, 18 Mar 2005 13:46:27 -0600
Nate Lawson wrote:
> Colin Percival wrote:
> 
>> Eric Anderson wrote:
>>
>>> Eric Anderson wrote:
>>>
>>>> Eric Anderson wrote:
>>>>
>>>>> I have a Dell Latitude D610 laptop, and my kernel says:
>>>>>
>>>>> CPU claims to support Enhanced Speedstep, but is not recognized.
>>>>> Please update driver or contact the maintainer.
>>>>> cpu_vendor = GenuineIntel msr = 6120e2606000e26, bus_clk = 64
>>>>>
>>>>> What does that mean to me?  How can I fix it?
>>
>>
>>
>> If the BIOS knows about enhanced speedstep and ACPI (which it should)
>> then you can probably get access to the different settings via the
>> acpi_perf.
> 
> 
> Yes, I have a patch that does this locally.
> 
>>>> I hate when I reply to myself, but.. After doing some more research, I
>>>> see that I have a Pentium M 750, but in cpufreq/est.c, I notice there
>>>> isn't an entry for it.
>>>> ...
>>>
>>>
>>> I think a section for the 750 needs to
>>> be added, but I'm not sure what to add exactly, and I'm now afraid I'll
>>> light my computer on fire if I try.
>>
>>
>>
>> That's exactly the problem I have.  In earlier Pentium M processors, 
>> Intel
>> helpfully published a complete listing of the frequency/voltage pairs,
>> which I encoded into est.c.  With the 133MHz Pentium M processors, Intel
>> decided not to publish all this; instead, they've just published the 
>> lowest
>> and highest pairs.
>>
>> I am told that the data I need is available in the "Prescott, Nocona, and
>> Potomac Processor BIOS Writer's Guide", but I can't get my hands on that
>> since I haven't signed an NDA, and I've been too busy lately to work out
>> how one goes about the process of obtaining and signing an Intel NDA.  (I
>> have no objection in principle to NDAs, as long as I'm able to publish 
>> the
>> resulting code.)
> 
> 
> Yep.  I finally was able to borrow a friend's T42 for the weekend and 
> can test/finish my patch.  I'll commit it once it's working.
> 


I'd be more than happy to test against my laptop and send any necessary output.   Do you think this could be affecting my S3 suspend mode at all?

Eric




-- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
I have seen the future and it is just like the present, only longer.
------------------------------------------------------------------------
Received on Fri Mar 18 2005 - 18:46:42 UTC

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