As a mechanism to implement the solution (not a fix to your problem), you could try doing like @pavlos suggested to me in this.
My own case was to create the following script (example of /etc/rc.local), which contains anything you need started after the basic OS has finished booting (even before you open your GUI session):
#!/bin/bash
/DB001_F2/Oasis/bin/HW_Admin__Power_SetFreqCPU.sh --default --service
As you can see, my file only contains the 1 line ... for now! 
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Reviewing these two references,
I think the command you have proposed is correct, as a boot-time solution, but each application has its own override, IF their code logic ignores the computer's current settings which, unfortunately, some do! But you won't discover those until you go to open those Apps.