Re: [CentOS] powernow-k8 in newer centosplus kernel

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.