I asked this question by myself and found out that this message is created through the underlying Slackware: https://www.linuxquestions.org/questions/slackware-14/locking-all-cpu's-to-their-maximum-frequency-4175607506/   So I checked my file as follows: cat /etc/rc.d/rc.cpufreq #!/bin/sh # # rc.cpufreq: Settings for CPU frequency and voltage scaling in the kernel. # For more information, see the kernel documentation in # /usr/src/linux/Documentation