I figured out a work around for this bug which i have posted on the ubuntu
forums:
http://ubuntuforums.org/showthread.php?p=2719839#post2719839
Step 1: Remove Userspace Scaling Software
Code:
sudo apt-get remove powernowd
Step 2: Restart
Acpi_cpufreq should no longer be loaded on startup and the processor(s) should
be clocked at their full speed but without scaling support.
Step 3: Manually load your CPU module
I did
Code:
sudo modprobe acpi-cpufreq
Step 4: Load Scaling Modules
I was only interested in ondemand, but load the one(s) you need.
Code:
sudo modprobe cpufreq_ondemand
(others)
Code:
sudo modprobe cpufreq_conservative
sudo modprobe cpufreq_powersave
sudo modprobe cpufreq_stats
sudo modprobe cpufreq_userspace
Step 5: Testing/Configuration
Show Available Governors
Code:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
Select the governor you desire like so
Code:
sudo -s
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
Step 6: Load Modules at Boot
Append your selected modules to the end of /etc/modules
Code:
[Step 3 module]
[Modules from Step 4]
Mine was
Code:
acpi-cpufreq
cpufreq_ondemand
Step 7: Configure Modules at Boot
This step needs to be done in order for the modules to retain your settings.
Make sure you have sysfsutils installed
Code:
sudo apt-get install sysfsutils
Then add the following lines to /etc/sysfs.conf
Code:
devices/system/cpu/cpu0/cpufreq/scaling_governor=ondemand
devices/system/cpu/cpu1/cpufreq/scaling_governor=ondemand
(If you have only one cpu then only the first line would apply)
Step 8: Reboot and enjoy
Hopefully everything should work now.
--
acpi_cpufreq detects intel e6400 with 600 to 800 MHz
https://bugs.launchpad.net/bugs/106447
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