That's strange, it has always worked for me :-/

** Description changed:

  By default I can't change the cpu frequency when my system is just booted. 
It's stuck to 800MHz
  My supported frequencies are 800MHz, 1,6GHz, 1,8GHz and 2,0GHz.
  I use the applet for gnome-panel and I can click 1,6, 1,8 and 2,0 but it 
never changes, it continues stuck at 800MHz.
  
  Workaround:
+ *WARNING!! Use it at your own risk* Read comments from gali98
  I have found a solution to make it work. If I open a terminal and type (as 
root obviously):
  modprobe -r cpufreq_stats; modprobe acpi_cpufreq; modprobe cpufreq_stats;
  
  I get:
  FATAL: Error inserting acpi_cpufreq 
(/lib/modules/2.6.27-3-generic/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko):
 Device or resource busy
  
  acpi_cpufreq is not loaded, but CPU SCALING WORKS!!
  
  This is quite wierd.
  To make it weirder: if my laptop is connected to the current, cpu scaling 
works without any workaround but if I disconnect it, cpu scaling doesn't work.
  
  Everytime that my system is rebooted I have to do it to get cpu scaling
  working with batteries.
  
  System:
  Ubuntu 8.10 fully updated (18 sept)
  Laptop is HP Pavilion tx2000 model (some other users have reported this issue 
in ubuntuforums too).
  
  logs.tar.gz includes:
  uname -a
  version_signature
  dmesg
  lspci -vvnn
  dmidecode
  /proc/acpi

** Description changed:

  By default I can't change the cpu frequency when my system is just booted. 
It's stuck to 800MHz
  My supported frequencies are 800MHz, 1,6GHz, 1,8GHz and 2,0GHz.
  I use the applet for gnome-panel and I can click 1,6, 1,8 and 2,0 but it 
never changes, it continues stuck at 800MHz.
  
  Workaround:
- *WARNING!! Use it at your own risk* Read comments from gali98
+ ********************** WARNING!! Use it at your own risk. Read comments from 
gali98. **********************
  I have found a solution to make it work. If I open a terminal and type (as 
root obviously):
  modprobe -r cpufreq_stats; modprobe acpi_cpufreq; modprobe cpufreq_stats;
  
  I get:
  FATAL: Error inserting acpi_cpufreq 
(/lib/modules/2.6.27-3-generic/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko):
 Device or resource busy
  
  acpi_cpufreq is not loaded, but CPU SCALING WORKS!!
  
  This is quite wierd.
  To make it weirder: if my laptop is connected to the current, cpu scaling 
works without any workaround but if I disconnect it, cpu scaling doesn't work.
  
  Everytime that my system is rebooted I have to do it to get cpu scaling
  working with batteries.
  
  System:
  Ubuntu 8.10 fully updated (18 sept)
  Laptop is HP Pavilion tx2000 model (some other users have reported this issue 
in ubuntuforums too).
  
  logs.tar.gz includes:
  uname -a
  version_signature
  dmesg
  lspci -vvnn
  dmidecode
  /proc/acpi

-- 
Need to unload/load some modules in order to get cpu-scaling working
https://bugs.launchpad.net/bugs/271973
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