Auke,
And your statement brings up an interesting question.....
Since many of us are using a non-netbook platform (i.e. SBC, and
COMexpress modules w/ carrier boards), we have a choice of what
hardware and therefore what BIOS should be used in our designs.
So which 'BIOSes', that you have worked with, work the best ("best"
being a highly subjective term) with Atom N CPUs?
Thanks,
Chris
Kok, Auke wrote:
ÁõÓ¦½Ü wrote:
Hi
thanks you all.
finally,I known form ACPI Specification ,and get what does these words: Pstat
e,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_ve
rify_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 mo
thed 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 sta
tes.
IOW your system may be in C6, but the BIOS only returns C4 to powertop.
Auke
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