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Subjectcpufreq/powernowd limiting CPU frequency on kernels >=2.6.16
Date
Most recent kernel where this bug did not occur:2.6.15
Distribution:Ubuntu64bit
Hardware Environment: X2 3800+, DFI NF4 Ultra-D, X800GT
Software Environment:
Problem Description: I overclocked via bios my cpu (factory: 200x10) to
2565mhz
(285x9), and I haven't any problems 'til 2.6.15, it goes down to 285x5 in
idle
and up to 285x9 in full load. If I upgrade to a newer kernel, it says 1ghz
in
idle and 1,8ghz in full load (I wonder it takes the fsb value, that is
200mhz,
directly form cpu and not from the bios, so it assumes 200x5 in idle and
200x9
in full load)
flapane@a64:~$ cpufreq-info
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 1000 MHz - 1.80 GHz
available frequency steps: 1.80 GHz, 1000 MHz
available cpufreq governors: userspace, powersave, ondemand, conservative,
performance
current policy: frequency should be within 1000 MHz and 1.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1000 MHz.
analyzing CPU 1:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 1000 MHz - 1.80 GHz
available frequency steps: 1.80 GHz, 1000 MHz
available cpufreq governors: userspace, powersave, ondemand, conservative,
performance
current policy: frequency should be within 1000 MHz and 1.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1000 MHz.


Steps to reproduce:
simply compile a kernel >=2.6.16 and try to overclock your cpu from the bios
raising the FSB (or HT)

Flavio
www.flapane.com

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