Saturday, June 16, 2007

I got a mail and now its lost

This week I got a mail from a guy that wondered about CPU-scaling on MSI S271 running Ubuntu. Since I have had a lot to do I have not had the time to answer it yet. Today I planned to answer the mail, but I can't find it. It's gone, cant be find in my gmail-box. So if you who wrote it read this, you are welcome to contact me again.

The mailer had some problems to get CPU-scaling work with Ubuntu using a AMD-CPU TL-56, which is the same CPU I have. There may be more people interested in this issue. For me the CPU-scaling worked out of the box. To check the CPU-scaling add the CPU Frequency Scaling Monitor to the panel. In the kernel used in Feisty and earlier Ubuntu versions there is only support to for two speeds of AMD CPU:s, full and half speed. I have read somewhere that more scaling is on its way. It would be nice if someone could confirm this.

As far as I know the CPU-scaling is included in AMD Powernow-technology. I have to scripts starting in my runlevel 2, check the /etc/rc2.d directory:

  • S10powernowd.early
  • S20powernowd

The modules I have loaded that can affect the CPU scaling are:
powernow_k8
asus_acpi
cpufreq_userspace
cpufreq_stats
cpufreq_powersave
cpufreq_ondemand
freq_table
cpufreq_conservative


I hope this give someone some help.

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