Athlon 64 UP CPU -- no frequency scaling support?

[Aioanei Rares]

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?