Can you please try with powernow_k8.c 1.18? looks like that msr_read needs 
to be
initialized, this was reported by FUKUMOTO Atsushi and it should avoid the 
hang.


----- Original Message ----- 
From: "Scott Ellis" <scotte@warped.com>
To: <current-users@netbsd.org>
Sent: Tuesday, April 03, 2007 4:52 AM
Subject: Failure of PowerNow! on amd64 -current


>I upgraded my amd64 system from -current Feb 22 to -current Apr 2, and 
>found that PowerNow! seems to cause an immediate hang (not even dropping to 
>DDB...just a solid lockup).
>
> Here's what I get in single-user, changing the frequency manually:
>
> # sysctl -a | grep power
> sysctl: warning: /var/run/dev.db: No such file or directory
> machdep.powernow.frequency.target = 2200
> machdep.powernow.frequency.current = 2200
> machdep.powernow.frequency.available = 1000 1800 2000 2200
> # sysctl -w machdep.powernow.frequency.target=1000
> k
>
> (yes, that "k" is all that's printed before the hang...it may be the last 
> gasp of the serial port before the crash!)
>
> The above (and more importantly, estd) works fine on the Feb 22 kernel.
>
> What info can I collect to help debug?