C states on AMD SMP

[Erik Slagter <erik-KW7PGP3XNp7a5EbDDlwbIw@public.gmane.org>]

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Hi,

I compiled & installed 2.6.13 (vanilla) on my Tyan Tiger S2466 (AMD768
chipset, 2xathlon MP 2600) yesterday. Indeed, as expected, acpi
"/proc/acpi/processor/*/power" (C states) is now supported on SMP. But,
to my surprise, it only shows one C state (C1), which, I assume, is
full-on. I am not completely sure about the CPU, but I do know that at
least the chipset supports C2 and C3 states (even got it sort of working
with pm_amd76x).

Can someone shine some light on this?

active state:            C1
max_cstate:              C8
bus master activity:     00000000
states:
   *C1:                  type[C1] promotion[--] demotion[--]
latency[000] usage[59379522]

--- 8-< ----

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Athlon(tm) Processor
stepping        : 1
cpu MHz         : 2133.515
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips        : 4266.27

Thx.

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