kernel-2.6.25-rc2, CPU C state "active state" always remain C0 unchangeable by cat 'proc/'

[youquan_song]

On Fedora9 Alpha with  kernel-2.6.25-rc2,
I run " watch -n 0.1 "cat /proc/acpi/processor/CPU*/power | grep 'active
state'" ", I find that the CPU C state information "active state" remain
at "C0" and it do not change any time. The same issue also exit on
2.6.24-rc2 kernel.
But with RHEL5.1 kernel-2.6.18 the CPU C state information is normal.


Every 0.1s: cat /proc/acpi/processor/CPU*/power | grep 'active state'     
                                                                        
Thu Feb 21 09:44:33 2008

active state:            C0
active state:            C0
active state:            C0
active state:            C0
active state:            C0
active state:            C0
active state:            C0
active state:            C0

On RHEL5.1  kernel-2.6.18-53.el5
[root@localhost ~]# cat /proc/acpi/processor/CPU*/power | grep 'active state'
active state:            C2
active state:            C2
active state:            C2
active state:            C2
active state:            C2
active state:            C3
active state:            C2
active state:            C3

The hardware platform: bensley and santarosa.

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