Public bug reported:
loadcpufreq: Discovered cpufreq kernel modules are not loaded any more
--Expected--
cpufreq driver to be loaded at boot when cpufrequtils is installed
--What happened instead---
The driver was not loaded. (Can be manually loaded).
--Description--
The shell script file `loadcpufreq' fails to load cpufreq driver kernel modules
since the modules were renamed.
Script: /etc/init.d/loadcpufreq
Kernel modules: /lib/modules/$(uname -r)/kernel/drivers/cpufreq/
The loadcpufreq script is hard-wired to know the cpu-specific module
names that it loads at boot. Additionally, it attempts to discover and
load other, unknown cpufreq drivers.
The unknown modules are assumed by the script to have a name beginning
`cpufreq_', eg, `cpufreq_nforce2'.
At some point, the cpufreq module names in the distro have been
rationalised resulting in the `cpufreq_' modules being renamed to
`cpufreq-'. Consequently, they are no longer discovered and loaded by
loadcpufreq.
--Solution--
Attached is a patch to loadcpufreq which resolves the problem. A changelog
entry is included. The diff is made against the latest (version 8) cpufrequtils
package source which has been verified against the Quantal version of
/etc/init.d/loadcpufreq.
I have tested the patch under a number of scenarios and am confident
that it does not introduce new problems or regressions. Perhaps it can
be floated upstream to the package maintainer.
--Impact--
Limited.
This bug will only affect systems with the cpufrequtils package installed, a
specific kernel configuration and particular cpu scaling hardware.
--Test case--
1. Install cpufrequtils under a kernel with a modularised rather than built-in
hardware-specific cpufreq driver named cpufreq-*.ko. Eg, an nforce2-based
machine running Quantal with kernel 3.5.0-18.29 with module cpufreq-nforce2.ko.
2. Reboot
3. Verify that the module has not been loaded at boot
% lsmod | grep cpufreq
4. Manually insert the module and verify.
% sudo modprobe cpufreq-<name>
% lsmod | grep cpufreq
5. Apply patch
6. Reboot
7. Repeat 3 above to verify that this time the module *has* been loaded.
My installation info
% lsb_release -rd
Description: Ubuntu 12.10
Release: 12.10
% apt-cache policy cpufrequtils
cpufrequtils:
Installed: 008-1
Candidate: 008-1
Version table:
*** 008-1 0
500 http://gb.archive.ubuntu.com/ubuntu/ quantal/universe i386 Packages
100 /var/lib/dpkg/status
** Affects: cpufrequtils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1084262
Title:
Discovered cpufreq kernel modules are not loaded any more
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