misc/140361: speed-stepping broken on PhenomII (acpi?)

Hannes freebsd at soulrebel.in-berlin.de
Sat Nov 7 15:20:02 UTC 2009

>Number:         140361
>Category:       misc
>Synopsis:       speed-stepping broken on PhenomII (acpi?)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Nov 07 15:20:01 UTC 2009
>Originator:     Hannes
>Release:        FreeBSD 8-RC2
FreeBSD fbsdmain.lan.home 8.0-RC1 FreeBSD 8.0-RC1 #0: Thu Sep 17 18:50:57 UTC 2009     root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
I have a new AMD PhenomII X4 (3.0Ghz) CPU. However powerd doesn't automatically reduce the freq.

I suppose this is due to the CPU-Load being incorrectly detected:

> sysctl -a | grep usage
dev.cpu.0.cx_usage: 100.00% last 500us
dev.cpu.1.cx_usage: 100.00% last 500us
dev.cpu.2.cx_usage: 100.00% last 500us
dev.cpu.3.cx_usage: 100.00% last 500us

(these are always 100% although system is mostly idle)

I would really like to be able to reduce freq, for energy, noise/heat and long--livety reasons!

Thank you very much!



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