Re: No c2-c7 states on core i7

[Erik Slagter <erik@slagter.name>]

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I am getting more and puzzled about this system/board/bios with the 
minute. I hope your guys will help me find out what's happening!

>>> Will you please attach the output of acpidump on the machine with the
>>> core i7 cpu?
>>> Please attach the output of every file
>>> under /sys/firmware/acpi/tables/dynamic/SSDT*?
>>>      cat /sys/firmware/acpi/tables/dynamic/SSDT1>   ssdt1
>>>
>>> Please also attach the output of /proc/cpuinfo.

I have attached a tar file with these tables from acpidump and from the 
sys directory, because acpidump yields two tables more than available in 
the directory /sys/firmware/acpi/tables, also the directory 
/sys/firmware/acpi/tables/dynamic is empty.

I have included both versions from "default" bios settings and slightly 
overclocked settings (where the _CST's are gone).

Please also have a look on this little table I created from tests, imho 
that cpufreq does nothing when idle (which I'd expect when c states are 
enabled and the system is using these, but not when no c states are 
availabled...)

Also it suggests that the presence and or usage of c states doesn't 
matter much in power consumption (3 watts in idle...)

More in the next message to keep things a little structured.

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results on very idle system, booted with init=/bin/sh

frequency							c states					idle cpufreq=lowest freq		idle cpufreq=highest freq		full load cpufreq=ondemand
overclocked 3.4 Ghz					disabled by bios			108								111								190
2.6 Ghz								enabled and active			100								100								170
default bios settings 2.6 Ghz		default disabled in setup	90								92								150
default bios settings 2.6 Ghz		enabled by user in setup	87								87								150