This bug also affects me.
When on battery, cpu frequency scales properly on-demand 1.6 to 2.8 GHz.
(current policy shows range of 1.6 to 2.8)
When AC adapter is plugged in, cpu frequency is locked at 1.6 Ghz. (current
policy shows range of 1.6 to 1.6)
-Computer-
Processor : 2x Intel(R) Core(TM)2 Duo CPU T9600 @ 2.80GHz
Memory : 4111MB (543MB used)
Operating System : Ubuntu 11.04
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
cpufreq stats: 2.80 GHz:5.64%, 2.80 GHz:0.28%, 2.13 GHz:0.35%, 1.60
GHz:93.73% (4292)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
cpufreq stats: 2.80 GHz:6.37%, 2.80 GHz:0.09%, 2.13 GHz:0.11%, 1.60
GHz:93.44% (2654)
----
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.60 GHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
cpufreq stats: 2.80 GHz:5.58%, 2.80 GHz:0.29%, 2.13 GHz:0.35%, 1.60
GHz:93.78% (4371)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.60 GHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz.
cpufreq stats: 2.80 GHz:6.27%, 2.80 GHz:0.09%, 2.13 GHz:0.11%, 1.60
GHz:93.53% (2720)
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https://bugs.launchpad.net/bugs/555315
Title:
ondemand CPU Scaling does not work when AC adapter is plugged in
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