Hi：
thanks for your answer。
first，
“I suspect that your system WILL go into C4.
If you are not sure, you can run the powertop tool,”how can we get this
tool.so we can exactly know which C and P states the system using.
then,
how can we set the CPU into Deeper sleep。like pxa270，we can change cpu
mode by writting cp15 register
we check the datasheet of both z5xx and SCH(us15wx) ,but find no description
of how can we generate the signals which can force CPU enter Deeper sleep.
在2009-09-16?13:43:30，"Arjan?van?de?Ven"?<ar...@linux.intel.com>?写道：
>刘应杰?wrote:
>>?Hi?zhang:
>>??
>>?????my?purpose?is?to?check?the?cpu?Actual?power?loss?when?cpu?work?in?Deeper?sleep(C4)（or?Deep?power?down(C6)）.?
>>?????as?you?say:"Which?cstate?will?be?entered?is?the?responsibility?of?cpu?idle?state?driver?of?OS,"?So?which?driver?of?moblin?work?on?this?function,and?how?can?we?change?the?cstate?in?usrspace?of?linux,the?driver?should?have?interface?which?we?can?use?in?my?applications.
>>??
>>?????looking?forward?your?answer
>
>you?fundamentally?CANNOT?change?that?state?from?userspace...?because?when?you?are?executing?in?userspace,?your?computer?is?not?idle?and?thus?
>cannot?be?in?an?idle?(C)?state...
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