Public bug reported:
Binary package hint: linux-source-2.6.22
cpu frequency scaling with kernel modules only adheres to stock speeds.
results with core2duo E6600 running@ 3ghz:
sudo -s
echo 2800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
cpufreq-info:
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 0
hardware limits: 1.60 GHz - 2.39 GHz
available frequency steps: 2.39 GHz, 1.60 GHz
available cpufreq governors: userspace, conservative, powersave, ondemand,
performance
current policy: frequency should be within 1.60 GHz and 2.39 GHz.
The governor "userspace" may decide which speed to use
within this range.
current CPU frequency is 2.39 GHz (asserted by call to hardware).
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 1
hardware limits: 1.60 GHz - 2.39 GHz
available frequency steps: 2.39 GHz, 1.60 GHz
available cpufreq governors: userspace, conservative, powersave, ondemand,
performance
current policy: frequency should be within 1.60 GHz and 2.39 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz (asserted by call to hardware).
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_min: 40000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max: 400000
(scaling works properly up to 3ghz in windows xp)
** Affects: linux-source-2.6.22 (Ubuntu)
Importance: Undecided
Status: New
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Cpu frequency scaling is limited to stock speeds
https://bugs.launchpad.net/bugs/132403
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