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System crash caused by the powernow-k8 kernel module


I'm having Debian GNU/Linux installed on my workstation with AMD
Athlon(tm) 64 X2 4800+ (actually 2.5GHz). From the very beginning after
the install I was getting multiple system freezes. This happens with
both linux images from unstable (2.6.22-3-amd64) and testing

Recently I've found that is caused by the powernow-k8 kernel module. I
can reproduce the problem easily by activating the 'Cool n Quiet'
option in the BIOS and just reboot the system. The freeze usually
happens after I'm logged in the X session probably when the load is

As a temporary workaround I've blacklisted the powernow-k8 module and
no more system freezes.

I would like to fill a bug report but I'm afraid I don't have enough
useful information to give. Can you tell me how can I debug a kernel

Thanks for your help.

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