Solving the powernow-k8: transmission frequency failed in Xen , Ubuntu 12.04 , AMD

Did this occur to you? It occured to me on Ubuntu Server 12.04 , on a machine with AMD processors, while installing a Xen Hypervisor dom0 :

powernow-k8: fid trans failed, fid 0x2, curr 0x0
powernow-k8: transmission frequency failed

If so, you might've read the posts here:
https://bugzilla.redhat.com/show_bug.cgi?id=739159
http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1789

and like me, did not understand what you should do.

What I did was to read here:
http://ubuntuguide.org/wiki/Ubuntu:Precise#Disable_CPU_Frequency_scaling

And follow their instructions:

sudo apt-get install rcconf dialog
sudo rcconf

Running rcconf displays a screen somewhat like this: (it's different on each machine, depending on it's available rc scripts)

(image taken from http://www.intelligrape.com/blog/tag/rcconf/ , direct link: http://www.intelligrape.com/blog/wp-content/uploads/2010/07/rcconf.png , used without permission.)

Removing acpi-support solved that for me. xen used to start spitting the powernow-k8 error less than a minute after I logged in. As of now, it's 10 minutes and everything seems to be working just fine...

sudo reboot when you are done.

The good part is that, well, it's working.

The bad part is that we don't have ACPI support. But since this bug is known since last year and I couldn't find any decent solution, I gave up. Hope I made the right choice...