I have the Ibex Beta (kernel 2.5.27-5 is the current kernel, I believe)
running on my HP Pavilion dv6324us with the AMD Turion 64x2 processor.
I also do not see any usage of c states beyond C1.
Output of cat /proc/acpi/processor/CPU0/* is as follows:
processor id: 0
acpi id: 0
bus mastering control: yes
power management: yes
throttling control: no
limit interface: no
<not supported>
active state: C0
max_cstate: C1
bus master activity: 00000000
maximum allowed latency: 2000000000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[000]
usage[02414989] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--] latency[005]
usage[00000000] duration[00000000000000000000]
C3: type[C3] promotion[--] demotion[--] latency[020]
usage[00000000] duration[00000000000000000000]
<not supported>
--
AMD turion does not have support for c states
https://bugs.launchpad.net/bugs/188739
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