Bug 5934 - System locks if cpufreq set to lowest level.
System locks if cpufreq set to lowest level.
Status: REJECTED INSUFFICIENT_DATA
Product: Power Management
Classification: Unclassified
Component: cpufreq
i386 Linux
: P2 normal
Assigned To: Mark Langsdorf
:
Depends on:
Blocks:
  Show dependency treegraph
 
Reported: 2006-01-21 13:16 UTC by David Pyke
Modified: 2006-11-09 04:43 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.16-rc1
Tree: Mainline
Regression: ---


Attachments
My dmesg with full debug on. (20.73 KB, text/plain)
2006-01-23 15:08 UTC, David Pyke
Details

Description David Pyke 2006-01-21 13:16:29 UTC
Most recent kernel where this bug did not occur: unknown
Distribution:  Gentoo
Hardware Environment: amd64
Problem Description:

I'm using the k8-powernow for powersaving on my X2-4200+ with cpufreq and
cpudyn.

When I start up, the k8-powernow statements are as follows:

powernow-k8: Found 2 AMD Athlon 64 / Opteron processors (version 1.50.4)
powernow-k8:    0 : fid 0xe (2200 MHz), vid 0x8 (1350 mV)
powernow-k8:    1 : fid 0x2 (1000 MHz), vid 0x12 (1100 mV)

This is confirmed by scaling_available_frequencies which echos
2200000 1000000

However, scaling_min_freq is 1452000 and that's what the powersave module
pushes down to.  if I force it to 1000000, my machine locks up.

The Gentoo devs told me to post it here after replicating it on the 2.6.16-rc1

Specs:
Motherboard: gigabyte GA-K8NF-9  BIOS F10 (latest)
Processor: Athlon 64 4200+
Comment 1 David Pyke 2006-01-21 13:17:07 UTC
Link to origiinal gentoo bug report :
http://bugs.gentoo.org/show_bug.cgi?id=117879
Comment 2 Mark Langsdorf 2006-01-23 06:11:41 UTC
Your system has a very weird PN! table.  I'd expect to see several P-states
going between 2.2 GHz and 1.6 GHz, then a 1.0 GHz P-state.

It's also weird that the driver is reporting a 1.0 GHz minimum P-state, but
cpufreq is not reporting that minimum frequency.

Please make sure you have the latest BIOS.

Also, could you turn on cpufreq debugging and recompile your kernel?  I'd like
to see if the driver is providing any additional messages.
Comment 3 Mark Langsdorf 2006-01-23 06:12:17 UTC
I will be going on a 2 month sabbatical starting February 2nd, 2006 and not returning until mid-April.  I will not be reachable by email or phone while on sabbatical.  My co-workers will be covering for me on technical issues, but I encourage everyone to close as any outstanding technical issue before I leave.

-Mark Langsdorf
Linux Validation Tools and Support
AMD, Inc.
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<P><FONT SIZE=2>I will be going on a 2 month sabbatical starting February 2nd, 2006 and not returning until mid-April.&nbsp; I will not be reachable by email or phone while on sabbatical.&nbsp; My co-workers will be covering for me on technical issues, but I encourage everyone to close as any outstanding technical issue before I leave.<BR>
<BR>
-Mark Langsdorf<BR>
Linux Validation Tools and Support<BR>
AMD, Inc.<BR>
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Comment 4 David Pyke 2006-01-23 15:08:49 UTC
Created attachment 7109 [details]
My dmesg with full debug on.

Here's the dmesg with full debugging turned on.  Seems, there's either a bad
table or a hard to read table.
Comment 5 David Pyke 2006-01-23 15:15:23 UTC
I was funning F10 until now, the dmesg attached is with the latest F11 bios,
just released.
Comment 6 Mark Langsdorf 2006-01-24 09:22:41 UTC
That BIOS is bad, but that still doesn't explain why cpufreq is sending the
wrong transition frequency to the driver.

Can you hook up a serial console and see what is transmitted before the hardlock?
Comment 7 Adrian Bunk 2006-11-09 04:43:39 UTC
Please reopen this bug:
- if it is still present in kernel 2.6.19-rc5 and
- you can provide the requested data.
Comment 8 Mark Langsdorf 2006-11-09 04:44:27 UTC
I will be at at a conference from November 5th until November 11th.  I wil have intermittent access to email until November 13th.

In my absence, refer Red Hat related Linux issues to Bhavana Nagendra at bhavana.nagendra@amd.com, and Novel related Linux issues to Joachim Deguara at joachim.deguara@amd.com.

-Mark Langsdorf
New Technology Products
AMD, Inc.
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<TITLE>Out of Office AutoReply: [Bug 5934] System locks if cpufreq set to lowest level.</TITLE>
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<P><FONT SIZE=2>I will be at at a conference from November 5th until November 11th.&nbsp; I wil have intermittent access to email until November 13th.<BR>
<BR>
In my absence, refer Red Hat related Linux issues to Bhavana Nagendra at bhavana.nagendra@amd.com, and Novel related Linux issues to Joachim Deguara at joachim.deguara@amd.com.<BR>
<BR>
-Mark Langsdorf<BR>
New Technology Products<BR>
AMD, Inc.<BR>
</FONT>
</P>

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