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Athlon 64 UP CPU -- no frequency scaling support?



The cpufreq-* modules are loaded, I tried both available Fedora kernels (2.6.31.5-96.fc12.x86_64 and
 2.6.31.1-56.fc12.x86_64, acpitool --cpu says :

CPU type               : AMD Athlon(tm) 64 Processor 3800+
  CPU speed              : 2400.392 MHz
  Cache size             : 512 KB
  Bogomips               : 4800.78
  Processor ID           : 0
  Bus mastering control  : yes
  Power management       : no
  Throttling control     : no
  Limit interface        : no
  Active C-state         : C0
  C-states (incl. C0)    : 0

But...in works in $OTHER_DISTRO and /proc/cpuinfo says

processor    : 0
vendor_id    : AuthenticAMD
cpu family    : 15
model        : 95
model name    : AMD Athlon(tm) 64 Processor 3800+
stepping    : 2
cpu MHz        : 2400.392
cache size    : 512 KB
fpu        : yes
fpu_exception    : yes
cpuid level    : 1
wp        : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow up rep_good extd_apicid pni cx16 lahf_lm svm extapic cr8_legacy
bogomips    : 4800.78
TLB size    : 1024 4K pages
clflush size    : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc


...so it obviously should support cpu frequency scaling. Any ideas?



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