[CentOS] powernow-k8 in newer centosplus kernel

Karanbir Singh mail-lists at karan.org
Fri Apr 10 12:16:19 UTC 2009


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.

-- 
Karanbir Singh : http://www.karan.org/  : 2522219 at icq


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