[Bug 33846] powernow-k8 will not load on Sempron-based system

[Matthew Dempsky]

Public bug reported:
https://launchpad.net/malone/bugs/33846

Affects: linux-source-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I have an Averatec 3280 with a Mobile Sempron 2800+.  powernow-k8 from
Breezy's linux-image-2.6.12-10-k7 package loads successfully and can
step down the processor, but the same driver from Dapper's linux-
image-2.6.15-17-k7 package prints the following when trying to load it:

    powernow-k8: Fonud 1 AMD Athlon 64 / Opteron processor (version 1.50.4)
    powernow-k8: MP systems not supported by PSB BIOS structure

I am not sure why it thinks the laptop is a multiprocessor system (I
didn't think the Sempron was based on a dual core processor), but I
suspect it is only an issue now because Dapper has dropped the separate
UP and SMP kernel packages.

Looking at the kernel source, it seems that num_possible_cpus must be
returning non-1 on line 1008 of powernow-k8.c, but I am not sure why.

(Without this working, the laptop runs much hotter and drains the batter
faster.)