Re: Centrino speedstep

Pedro Venda
2004-12-30T16:36:24Z

Bruno Ducrot wrote:
> On Tue, Dec 28, 2004 at 10:26:53PM +0100, Dominik Brodowski wrote:
>
>>On Tue, Dec 28, 2004 at 09:32:00PM +0100, Johan Vromans wrote:
>>
>>>Hi,
>>>
>>>On my Acer Travelmate 4000WLMi, with various 2.6.9 and 2.6.10 kernels
>>>and patch sets, I keep getting the following message:
>>>
>>> speedstep-centrino: invalid ACPI data
>>> speedstep-centrino: no table support for CPU model "Intel(R) Pentium(R) M processor 1.50GHz":
>>>
>>>(Some kernels report "Invalid control/status registers" instead of
>>>"invalid ACPI data").
>>>
>>>My latest attempt was the stock 2.6.10 kernel, with ACPI patch set
>>>acpi-20041210-2.6.10-rc3.diff, and a fixed DSDT. Still no success.
>>>
>>>Any help is appreciated.
>>
>>It looks like your notebook's BIOS does not report sufficient data to the
>>speedstep-centrino cpufreq driver. Does the acpi-cpufreq driver work
>>instead?
>>
>
>
> After looking the DSDT, this laptop do not support the _PDC switch, so
> the cpufreq-centrino driver will not work. But it should work with the
> acpi io driver though.
>
> This also mean there is no way to get the ondemand governor (or any DVS
> requiring low latency driver) to work with this one (unless hardcoding
> a table in the cpufreq-centrino).
>
> There is no _CST also, this means there is no C4 support :(
>

sorry for interrupting thread flow, but I didn't understand this one...

I'm running on a tmate 4001 WLMi with speedstep-centrino driver and ondemand
governor.

I don't see any problems... the clock scales correctly and fast... Is it
possible to have a different DSDT from dominik's?

regards,
pedro venda.
--

Pedro João Lopes Venda
email: pjlv-aHmAgkVUFT6Joy8PIJZ9VA@public.gmane.org