Public bug reported:

Thread link: https://answers.launchpad.net/ubuntu/+source/acpi/+question/143039
I installed the applet as I suspected my CPU was at half speed.
When I first start the computer it works correctly and then for no apparent 
reason the governor switches the max speed down to 800MHz and it will not 
increase it later. The fan doesn't come on so I do not think it is because the 
CPU is hot.
I have attached the info below.
Every day after about 15min of starting the computer up the governor will 
change the text from:
  current policy: frequency should be within 800 MHz and 1.73 GHz.
 current policy: frequency should be within 800 MHz and 800 MHz.

It then remains at 800Mhz for the rest of the time the computer is on.

[code]
j@j-Inspiron-9300:~$ date
Thu Jan 27 09:05:41 CET 2011
j@j-Inspiron-9300:~$ cpufreq-info
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.73 GHz
  available frequency steps: 1.73 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, 
performance
  current policy: frequency should be within 800 MHz and 1.73 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 1.73 GHz.
  cpufreq stats: 1.73 GHz:18.10%, 1.33 GHz:1.19%, 1.07 GHz:0.59%, 800 
MHz:80.12%  (9055)

j@j-Inspiron-9300:~$ date
Thu Jan 27 09:20:23 CET 2011
j@j-Inspiron-9300:~$ cpufreq-info
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.73 GHz
  available frequency steps: 1.73 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, 
performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.
  cpufreq stats: 1.73 GHz:24.51%, 1.33 GHz:3.24%, 1.07 GHz:1.13%, 800 
MHz:71.13%  (28892) 
[/code]

** Affects: acpi (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/709390

Title:
  CPU governor changes speed to minimum only

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