To be honest I have no clue how to go about doing that. I will look into it when I get the time.
After a quick google this should be a pretty simple fix.

I just checked psxita v3 cuz I remember it having the tearfree thing and indeed the above screenshot seems to be the fix. I did notice on psxita v3 the 20-amdgpu.conf was located in /etc/x11/xorg.conf.d
Hope this solves the issue you're having. TearFree-Script