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xen-devel
AW: RE: RE: RE: [Xen-devel] No C-States any longer...
Maybe a dump question, but in the beginning of our discussion, we had:
>> In drivers/scpi/processor_idle.c:
...
>> On a working Intel machine, it will go through it like this:
>>
>> - acpi_processor_get_power_info_cst, which returns 0
>> - acpi_processor_get_power_info_default
>> - later acpi_processor_power_verify will find some c-states
>
>this is expected sequence
>
>>
>> On my non-working AMD machine, it will go through like this:
>> - acpi_processor_get_power_info_cst, which returns -ENODEV
>> - acpi_processor_get_power_info_fadt, which also return -ENODEV
>> - this result is returned
There is a comment in acpi_processor_get_power_info_default it is
said that all processors need to support C1 at least. So (hypothesis),
if my BIOS is not implemented as specified (neither _CST nor PBLK),
shouldn't acpi_processor_get_power_info_default also bee called on my
machine? Is the code exiting too early?
Carsten.
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