[CentOS] powernow-k8 in newer centosplus kernel

JohnS jses27 at gmail.com
Fri Apr 10 15:37:47 UTC 2009

On Fri, 2009-04-10 at 12:16 +0100, Karanbir Singh wrote:
> Mark Pryor wrote:
> > Using kernel:
> > 2.6.18-92.1.13.el5.centos.plus
> > the cpu throttling works as desired (see 2 traces below)
> ...
> > When I update to the newer xx-128.1.6 centosplus kernel all the throttling stops and the box runs at highest speed.
> This is an issue that came up in the early 5.2 days, and has been 
> recurring since. I lost cpuspeed control on my desktop at home as well ( 
> amdx24800/m2n) with the kernel update. Have not started digging into 
> this, but the last time I did upstream blamed it on badly done acpi code 
> in the system BIOS. It *should* now be possible to blacklist the 
> powernow-k8.ko code and let the kernel fallback to using the generic 
> acpi layer again. YMMV.
Good thing to know it's just not happening to me also. I also have
client machines this has affected and my own personal machines. This was
with the p4-clockmod driver. Motherbords all were Asus. Also affected
one Celeron machine on an Asus board.


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