Kok, Auke wrote:
ÁõÓ¦½Ü wrote:
Hi
thanks you all.
finally,I known form ACPI Specification ,and get what does these words:
Pstate,Cstate,Gstate,State and Tstate mean.
as wang says,"It is kernel who put into some Cx state safely." I checked the file
"drivers/acpi/processor_idle.c" in kernel,and find "acpi_processor_power_verify_cx"
change the CPU cstate in final.
So any other driver who can can the funtion "acpi_processor_power_verify_cx"
is not safe,the kernel will be wakeup by interrupt.
I checked the CPU cstate and pstate by the tool Power-top,and find the cpu
is always in C4(Deeper sleep)/P2(600MHz) when user have no opertions.so we can
get the cpu Actual power loss.
By the way,can anybody known how to test the notebook Power Loss,and what
mothed and tools.
thanks.
actually powertop cannot currently report the deepest C state number correctly,
as
the number is reported by the BIOS, and we've seen many BIOSes hide deeper C
states.
IOW your system may be in C6, but the BIOS only returns C4 to powertop.
actually.. we do report the hardware C state for most cases, on intel systems.
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