Red Hat Bugzilla – Bug 438326
kernel module p4-clockmod no longer available
Last modified: 2008-04-12 08:37:33 EDT
Description of problem:
Since Kernel 2.6.24 the cpufrq module p4-clockmod isn't any longer included in
cat /boot/config-126.96.36.199-80.fc7 | grep P4_CLOCKMOD
gives following information
# CONFIG_X86_P4_CLOCKMOD is not set
This is quite redicolous because there was no announcement that this module will
be disabled. Even so, I see no need to disable this and I guess that users of a
Pentium 4 won't be happy to let their CPU run at full speed all the time.
Version-Release number of selected component (if applicable):
Kernel 2.6.24, Fedora 8
Steps to Reproduce:
1. run Fedora 8 with Kernel 2.6.24 and try to adjust the speed of a Pentium 4
P4 like processors run at full speed permanently, missing p4-clockmod produces
errors at the start of cpufreq and related software
cpufreq with p4-clockmod should clock a P4 processor autmatically
It would be nice for users of older Pentium 4 CPUs if the module p4-clockmod
will be included again.
*** This bug has been marked as a duplicate of 428895 ***
Excuse me for beeing a bit rude, but this isn't a solution for the underlying
If the module itself has a problem, it should be fixed, not disabled. On the
other hand it isn't really fair to do so just by the report of one reporter.
There are at least two persons whih don't have these issues.
So you should try and fix the difficulties or at least try to get a workaround
it has no redeeming value, and it's not clear that the problem cases are fixable.
I made a fresh installation of Fedora 8 via DVD to see where the error lies.
I have the following results:
With the release kernel of Fedora 8 (2.6.23-1.42) p4-clockmod IS FULLY
OPERATIONAL on a P4 with HT on.
That means I am able to use either ondemand, userspace or performance scaling
of the CPU through cpuspeed. The lowest frequency can be 325MHz, the highest is
at 2.6GHz. No errors occured during the test. I've tried to reproduce the case
mentioned in this bug.
but everything works fine.
I would suggest to re-enable this module as quick as possible and to follow the
suggestion to blacklist it only.