Bug 161968

Summary:	cpuspeed fails to start on Pentium-M Dothan Centrino Processor
Product:	[Fedora] Fedora	Reporter:	Eugene Roux <eroux>
Component:	cpuspeed	Assignee:	Dave Jones <davej>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4	CC:	pfrields
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-07-05 19:26:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Eugene Roux 2005-06-28 19:43:28 UTC

From Bugzilla Helper:
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Description of problem:
cpuspeed fails when I attempt to start it without specifying a DRIVER variable in /etc/cpuspeed.conf.

Since the speedstep_centrino driver is compiled into the kernel, one would expect it to start without problem, but I get a "Error: Could not open file for writing: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" when I start cpuspeed.

If I change the DRIVER="p4-clockmod" in /etc/cpuspeed.conf, cpuspeed starts, albeit with a "p4-clockmod: Warning: Pentium M detected. The speedstep_centrino module offers voltage scaling in addition of frequency scaling. You should use that instead of p4-clockmod, if possible." warning.

/proc/cpuinfo gives:
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Pentium(R) M processor 1.60GHz
stepping        : 6
cpu MHz         : 1595.109
cache size      : 2048 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe est tm2
bogomips        : 3162.11

Which is supposedly supported by 2.6.9 onwards...

Version-Release number of selected component (if applicable):
kernel-2.6.11-1.1369_FC4

How reproducible:
Always

Steps to Reproduce:
See description

Actual Results:  See description

Expected Results:  CPU scaling should work

Additional info:

Comment 1 Dave Jones 2005-07-05 19:26:03 UTC

The driver doesn't support Dothan core CPUs. Unfortunatly it likely never will
unless we get relevant information from Intel to determine which set of voltages
are safe to use.  We have no way of knowing which of the 4 sets of VID pins are
in use, and guessing could potentially damage systems, so we're stuck with the
current situation.