Thanks:-) Where do i find the screwdriver for using the screws that comes with the fan?
Hello, Those are TA, tamper-resistant heads. These are often found in security bit kits.
I just use a flat blade jeweler’s screwdriver. Very little torque will be required to tighten these fasteners. Usually I can just hold pressure against the head and turn the nut.
As always, use caution not to overtighten metal fasteners when used with plastic parts.
Edit: I should have just posted this link. 
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what is the cpufreq driver used by VIM and VIM2, I need info on cpufreq-info on 3.14.x and 4.9.x kernel.