I've recently been bitten by
http://bugzilla.kernel.org/show_bug.cgi?id=7157 - I also have an HP
nc6400, with bios F.05, and can't downgrade to F.03 because my CPU only
became supported in F.05. While I'm waiting to see if HP will fix this
problem in a future bios rev, I wondered why cpufreq needs any bios
information in the first place?
This is all well outside my technical expertise, so I'm sure that I'm
misunderstanding the problem - but that's why I'm asking. Basically my
question is: why can't cpufreq interrogate the CPU directly, in order to
find out what sort of cpu frequency scaling it supports (SpeedStep in
various flavors, PowerNow, and whatever else is out there in the wild)?
Wouldn't that be more robust than relying on the bios to get it right?
As a side issue, how does Windows XP solve this problem? From what I can
tell, Windows XP does use frequency-scaling with my CPU (according to
the NHC software from http://www.pbus-167.com/).
Again, I'm sure that I'm misunderstanding the technical issues here, but
I'd like to understand them. I'm also happy to post a summary on the
acpi wiki, so that the question is less likely to come up again.
thanks,
-- Mike
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