Re: No c2-c7 states on core i7

Erik Slagter
2009-11-23T19:23:28Z

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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