Confirming for 2.6.24-16-generic.
CPU get throttled, according to "grep MHz /sys/devices", but there's no 
userspace interface.

$ cat /sys/devices/system/cpu/cpuidle/current_driver
acpi_idle

$ lsmod | grep cpu
cpufreq_powersave       2688  0
cpufreq_stats           7104  0
cpufreq_userspace       5284  0
cpufreq_ondemand        9740  1
cpufreq_conservative     8712  0
freq_table              5536  3 powernow_k8,cpufreq_stats,cpufreq_ondemand

$ dmesg | egrep 'cpu|power'
[   39.675102] cpuidle: using governor ladder
[   39.675150] cpuidle: using governor menu
[   90.464446] powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3000+ 
processors (1 cpu cores) (version 2.20.00)
[   90.464476] powernow-k8:    0 : fid 0xa (1800 MHz), vid 0x6
[   90.464478] powernow-k8:    1 : fid 0x2 (1000 MHz), vid 0x12


** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium
       Status: New => Triaged

** Summary changed:

- cpufreq dirs in /sys don't show up
+ cpufreq dirs in /sys don't show up anymore

-- 
cpufreq dirs in /sys don't show up anymore
https://bugs.launchpad.net/bugs/205087
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