Same problem here:
$ dmesg | grep powernow
[ 58.990097] powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3000+
processors (version 2.00.00)
[ 58.997274] powernow-k8: BIOS error - no PSB or ACPI _PSS objects
$ uname -a
Linux neo2 2.6.22-14-generic #1 SMP Sun Oct 14 23:05:12 GMT 2007 i686 GNU/Linux
$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 47
model name : AMD Athlon(tm) 64 Processor 3000+
stepping : 0
cpu MHz : 1808.834
cache size : 512 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 clflush mmx fxsr sse sse2 syscall n
x mmxext fxsr_opt lm 3dnowext 3dnow up pni ts fid vid ttp tm stc
bogomips : 3619.98
clflush size : 64
$ sudo /etc/init.d/powernowd restart
* Stopping powernowd:
[ OK ]
* Starting powernowd...
/etc/init.d/powernowd: 156: cannot
create /sys/devices/system/cpu/cpu0//cpufreq/scaling_governor: Directory
nonexistent
* CPU frequency scaling not supported
--
CPU frequency scaling isnt workin
https://bugs.launchpad.net/bugs/44699
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