Bug 244030 - powernow-K8 doesn't load on MP systems
powernow-K8 doesn't load on MP systems
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
x86_64 Linux
low Severity medium
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
Depends On:
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Reported: 2007-06-13 09:36 EDT by Alec Leamas
Modified: 2007-11-30 17:12 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2007-08-29 13:51:47 EDT
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Description Alec Leamas 2007-06-13 09:36:43 EDT
Description of problem: powernow-K8 doesn't load on MP systems, and power
consumption thus becames (too) high.

Version-Release number of selected component (if applicable):

kernel 2.6.20-1.2952.fc6. Has been around since I changed mobo, before FC6 was

How reproducible: Always at boot time.

Steps to Reproduce:
1. Boot FC6 on my Asus M2N32 WS Pro mobo
2. See dmesg log "powernow-k8: MP Systems not supported by PSB BIOS structure"

Actual results: CPU always runs at max speed, Error dialogs when starting Gnome  UI.

Expected results: powernow-K8 running, decreased CPU speed when applicable,
decreased pwer consumption.

Additional info: This is basically a bug in the Asus BIOS. However, it seems
unlikely that it ever will be fixed, and we thus might be forced to live with it.

Hw: Asus M2N32 WS pro CPU: : AMD Athlon(tm) 64 X2 Dual Core Processor 4200+
BIOS: Asus firmware 1102

Possibly a dup to bug 185578, reported against RH4.
Comment 1 Tim Born 2007-07-18 20:29:53 EDT
I'm also seeing this error ('powernow-k8: MP systems not supported by PSB BIOS
structure') on every boot up of a Dell Inspiron 531s, Athlon 64 X2.  I'm running
RHEL5 at the moment.

Would love to help test any fix.  I really don't need to be running full out all
the time.  Waste of energy and it generates a lot of heat.
Comment 2 Tim Born 2007-07-18 20:56:06 EDT
Found the solution in the BIOS (Dell Inspiron 531s).  It's not in the power
section, it's under Advanced / CPU Configuration / AMD Cool'n'Quiet Function. 
It ships in the disabled state, for some reason, but when enabled the powernow
seems to load correctly.
Comment 3 Martin Bacovsky 2007-08-29 07:29:39 EDT
I suppose this is assigned on kdnssd-avahi by mistake. Changing component to 
Comment 4 Chuck Ebbert 2007-08-29 13:51:47 EDT
This is almost certainly a BIOS bug.

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