Can I scale ONLY my primary monitor?

[CS_DBA]

Hi All;

I have a shiny new 1920x1080 screen on a laptop running Fedora 20.

I've gone into system settings (KDE) "system settings --> application 
appearance --> Fonts" and set the "Force fonts DPI to 115 which I sortof 
like on my laptop display but not so thrilled with it on the external 
display(s) I use

Is there a way to scale ONLY the laptop / primary display?


Thanks in advance