I am running 3.0.0-16-generic, and am seeing this. This is a Dell E6520,
and it appears the acpi-cpufreq module built into the kernel is not
being applied..
nc@knight:~$ uname -a
Linux knight 3.0.0-16-generic #28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
nc@knight:~$ cpufreq-info
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 1:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 2:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 3:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 4:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 5:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 6:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
analyzing CPU 7:
no or unknown cpufreq driver is active on this CPU
maximum transition latency: 4294.55 ms.
nc@knight:~$ dmesg | grep -i cpufreq
[ 11.529760] p4-clockmod: Warning: EST-capable CPU detected. The acpi-cpufreq
module offers voltage scaling in addition to frequency scaling. You should use
that instead of p4-clockmod, if possible.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/797190
Title:
Ubuntu 11.04 Natty upgrade underclocks and disables CPU scaling
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