Here is the output of cpufreq-info:

Code:
root@bt:~# cpufreq-info
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
analyzing CPU 1:
  no or unknown cpufreq driver is active on this CPU
On the same machine, using Debian testing (kernel2.6.28), I have the cpufreq scaling just fine.

Here are more related/background info:

Code:
root@bt:~# modprobe acpi_cpufreq
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.29.4/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko): No such device

root@bt:~# ls -l /lib/modules/2.6.29.4/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko
-rw-r--r-- 1 root root 10392 2009-06-18 10:11 /lib/modules/2.6.29.4/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko
root@bt:~#

root@bt:~# lsmod | grep -i cpu
cpufreq_stats           4720  0
cpufreq_powersave       1260  0
cpufreq_performance     1292  0
cpufreq_ondemand        6712  0
freq_table              3468  2 cpufreq_stats,cpufreq_ondemand
cpufreq_conservative     6004  0

root@bt:~# dmesg | grep governor
cpuidle: using governor ladder
cpuidle: using governor menu
root@bt:~#

root@bt:~# uname -a
Linux bt 2.6.29.4 #3 SMP Mon May 25 18:50:05 EDT 2009 i686 GNU/Linux

root@bt:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 17
model           : 3
model name      : AMD Athlon(tm) X2 Dual-Core QL-64
stepping        : 1
cpu MHz         : 2100.003
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
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 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch osvw skinit
bogomips        : 4201.00
clflush size    : 64
power management: ts ttp tm stc 100mhzsteps hwpstate

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 17
model           : 3
model name      : AMD Athlon(tm) X2 Dual-Core QL-64
stepping        : 1
cpu MHz         : 2100.003
cache size      : 512 KB
. . .
please help.

thanks