Re: C-States Usage/Accounting

[Janosch Machowinski <scotch@tzi.de>]

Eduard Giménez Cerdà schrieb:
> Hello,
> 
> I've two machines with the following configuration:
>     Processor:    Intel Core Solo T1300 / Intel Celeron M 420
>     Mainboard:    Asus N4L-VM DH with Intel 945GM Chipset with an AMI BIOS
>     (I suppose the drives and the memory are not important)
> 
> With the vanilla kernels 2.6.18 and 2.6.19 the 
> /proc/acpi/processor/CPU1/info file shows that there is no bus mastering 
> nor power management, and looking at /proc/acpi/processor/CPU1/power the 
> states accounting only shows the C1 state but without any data (0 or -- 
> on all the values), although it shows that the maximum C-State is C8.
C8 is the maximum C-State supported by Linux.

Actually is could be, that nothing is broken. If the bios does not 
export more than one C-State, than everything is (from the view of 
linux) ok. If you want to find out, what C-States are exported by the 
bios, decompile your DSDT (can be found under /proc/acpi/dsdt) with the 
  IASL compiler 
(http://www.intel.com/technology/iapc/acpi/license2.htm), and search in 
the decompiled version for _CST. More information about the _CST object 
can be found in the ACPI-Specification (www.acpi.info)

	Janosch

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