I've seen this alot, and never paid it too much mind, but this time, i got to the bottom of it:


[root@localhost ~]# cat /lib/systemd/fedora-loadmodules 
#!/bin/bash

# Load other user-defined modules
for file in /etc/sysconfig/modules/*.modules ; do
  [ -x $file ] && $file
done

# Load modules (for backward compatibility with VARs)
if [ -f /etc/rc.modules ]; then
        /etc/rc.modules
fi


1) if there is no modules the for loop will run once with "*.modules" and have exit code 1

we should safeguard against it:


...
# Load other user-defined modules
if test "/etc/sysconfig/modules/*.modules" != /etc/sysconfig/modules/*.modules; then
  for file in /etc/sysconfig/modules/*.modules ; do
    [ -x $file ] && $file
  done
fi
...


2) in /etc/rc.modules, it loads modules from /etc/modprobe.preload.d/*

which is all find and dandy.

for me there is a cpufreq in it with 4 modules:

[root@localhost ~]# cat /etc/modprobe.preload.d/cpufreq 
powernow-k8
cpufreq_powersave
cpufreq_conservative
cpufreq_ondemand



dmesg | grep power showed me why powernow-k8 isn't loaded:

[root@localhost ~]# dmesg | grep power
[    9.865392] powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3400+ (1 cpu cores) (version 2.20.00)
[    9.866496] [Firmware Bug]: powernow-k8: No PSB or ACPI _PSS objects
[    9.866498] powernow-k8: Make sure that your BIOS is up to date and Cool'N'Quiet support is enabled in BIOS setup


in other words... Cool'N'Quiet was disabled in BIOS, which often happens in servers.

perhaps when detecting cpufreq support we should check if we allow it? before adding this to preload?