I don't know if this occurred in a release prior to Trusty so I
downloaded 12.04.3 LTS (Precise Pangolin) - the distro linked to in your
post - and ran it from a USB stick. The short answer is that the
problem also exists in Precise. Slightly longer answer - the CPU is
recognised/named correctly but it only runs at 2.4 Ghz and there is no
CPU scaling. I could not get "cpupower frequency-info" to run (as per
original bug report) but running "cpufreq-info" in a terminal returns:
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: 2.40 GHz - 2.40 GHz
available frequency steps: 2.40 GHz, 2.40 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 2.40 GHz and 2.40 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.40 GHz.
cpufreq stats: 2.40 GHz:78.72%, 2.40 GHz:21.28% (1610)
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: 2.40 GHz - 2.40 GHz
available frequency steps: 2.40 GHz, 2.40 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 2.40 GHz and 2.40 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.40 GHz.
cpufreq stats: 2.40 GHz:95.56%, 2.40 GHz:4.44% (259)
I also installed CPU Frequency Scaling Indicator, as per my original bug
report, and it behaves the same - showing only 2.4 Ghz and 2.4 Ghz
(turbo mode) as available frequencies, and if I manually change to
Powersave or Performance it makes no difference to the speed the CPU
runs at. Precise (mis)behaves exactly the same as Trusty.
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https://bugs.launchpad.net/bugs/1396291
Title:
Maximum CPU frequency incorrect and there is no CPU scaling
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