linux-kernel - RE: cpufreq not working on AMD K8 (was Re: 2.6.19-rc1: known regressions)

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Date:	Tue, 10 Oct 2006 11:43:08 -0500
From:	"Langsdorf, Mark" <mark.langsdorf@....com>
To:	"Christian" <christiand59@....de>
cc:	linux-kernel@...r.kernel.org
Subject: RE: cpufreq not working on AMD K8 (was Re: 2.6.19-rc1: known
 regressions)

> Am Dienstag, 10. Oktober 2006 16:59 schrieb Langsdorf, Mark:
> > > I have an AMD K8 system and I'm unable to get cpufreq working
> > > with 2.6.19-rc1.
> > > The cpufreq sysfs directory is missing under
> > > /sys/devices/system/cpu/cpu0/.
> > > 2.6.18 works as expected.
> >
> > What error message are you getting from `dmesg | grep power` ?
> 
> dmesg | grep power
> [   17.852383] powernow-k8: Found 2 AMD Athlon(tm) 64 X2 Dual 
> Core Processor 
> 3800+ processors (version 2.00.00)
> [   17.852403] powernow-k8: MP systems not supported by PSB 
> BIOS structure
> [   17.852428] powernow-k8: MP systems not supported by PSB 
> BIOS structure
> 
> Haven't seen this before.

I thought I cleaned that message out in v2.0.

The BIOS failed to supply _PSS objects that Linux could
recognize.  The powernow-k8 driver tried to use a PSB 
table, but MP/dual-core systems can't use PSB tables.  
The driver errored out.

If you can get it to work with 2.6.18 and it doesn't work
with 2.6.19-rc1, the most likely culprit is a change in the
ACPI subsystem.

Can you get decompiled dumps of the DSDT?  See the ACPI
pages on sourceforge if you need instructions. 

-Mark Langsdorf
AMD, Inc.


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