From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Klaffenbach <danielklaffenbach@gmail.com>
Subject: Issues with ondemand governor on overclocked CPU
Date: Sat, 1 Jan 2011 23:13:26 +0100
Message-ID: <201101012313.39077.danielklaffenbach@gmail.com>
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Hi,

I am using a Core2 Quad (Q9650) on a Gigabyte GA-EP45-DS4 board. The defaul=
t=20
CPU specs look like this:
  * FSB: 333MHz,
  * Multiplier: 6-9
=20
without overclocking frequency scaling with acpi-cpufreq works pretty well =
=2D=20
it either uses a 6x multiplier (2 GHz) or a 9x multiplier (3 GHz).
=20
After setting the FSB to 400MHz and limiting the multiplier to 6-8 in the B=
IOS=20
(3,2 GHz), frequency scaling with the ondemand governor does not work any=20
more. The actual frequency information is still correct:

# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies=20
3200000 2400000

However the ondemand governor does not do any upscaling any more - the CPU =
is=20
stuck at 2,4 GHz. It is still possible to use the maximum frequency by sett=
ing=20
"scaling_min_freq" to "3200000" (or probably by using the performance=20
governor).

Is this expected? Could this be a bug? Without limiting the multiplier=20
(leaving the default 6/9) ondemand scaling also works as usual (2,4 GHz/3,6=
=20
GHz).

Kernel version: 2.6-git


Regards,
 Daniel

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