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RE: CPU scaling problems




-----Original Message-----
From: Mark Allums [mailto:mark@allums.com] 
Sent: Thursday, November 15, 2012 12:34 PM
To: 'debian-user@lists.debian.org'
Subject: RE: CPU scaling problems

>>>>>  Francesco wrote:

I have installed Debian testing on a X1 Carbon, processor i5-3427U.

My problem is the following: when the `ondemand' governor is active, the
processor clock never scales up, it always stays at 800Mhz.  The situation
changes when using the `conservative' or the `performance' governors.  More
curiously, if I set `conservative'/`performance' as the governor for at
least one core, the CPU will scale.  I am on the 3.6.6-trunk-amd64 kernel
from experimental because the intel video driver 3.2 causes random freezes.
To test if the scaling occurs I run `stress -c 4'.

Things I have tried:

* Enabling/disabling `cpufreqd', `laptop-mode', and `acpid'.  I currently
run
  `laptop-mode'.
* The 3.2 kernel in testing
* Enabling/disabling the `xfce4-power-manager', which I use to manage
  suspends/hibernate.

There are some kind-of relevant BIOS options and I will try with those soon
but I doubt that's the issue.

Does anybody have any idea on how to troubleshoot such a problem?  I suspect
that the problem is either in the kernel or in some other software which is
regulating the scaling.
<<<<<

>>>>>
> At a guess, I would assume a configuration problem.  Or no problem.  Is
your machine sluggish or unresponsive?  How do you know it stays at 800 MHz?
What > tool do you use to monitor it?  Maybe your monitor is wrong.  I am
not sure how to troubleshoot this, but if you don't need the governor, turn
it off or use the > 'performance' one.  

> If you solve the problem, let us know the solution, it may be useful to
others.

> Good luck!
<<<<<

Sorry, I should have said, Have you tried *another* monitor tool besides
'stress'?

Mark




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