"Your BIOS does not provide ACPI _PSS objects in a way that Linux
understands" almost always means that Cool 'n' Quiet has been disabled
in the BIOS. This kernel message also isn't really an error, it just
tells that the kernel will not use CPUFREQ powernow-k8 support because
Cool 'n Quiet has been disabled, so it's doing exactly what is
requested.

Please verify that C 'n' Q has indeed been disabled in the BIOS, and
then determine what you want. If you don't want Cool 'n' Quiet you can
ignore this message (powernow-k8 has been built-in in the kernel so you
cannot prevent this message from being displayed).

(To enable, go into your BIOS and go to "Advanced" => "CPU
Configuration" => "Cool 'n' Quiet" and set it to "Enabled")

-- 
AMD 6000+ Cool'n'Quiet does not work (ACPI)
https://bugs.launchpad.net/bugs/347002
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