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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