Inverted function keys (F1-F12) on HP Pavilion dv4t

(I know there have already been a lot of questions about this, but none of them mentioned the dv4t specifically.)

I'm thinking about getting an HP Pavilion dv4t-4200 or -5100, but something that's really irritating me is that by default the function keys (F1-F12) are "inverted"—without holding the Fn key, the function keys do things like change the brightness, change or mute the volume, and switch to an external display. Only if you hold Fn will they actually produce F1, F2, etc. This is not how keyboards are supposed to work. Is there any way to disable this "feature" that has been verified to work on the HP Pavilion dv4t-4200 or HP Pavilion dv4t-5100? I don't want to buy one unless this is possible.

Edit: One proposed solution works on the Pavilion dv7 (confirmed here), the Pavilion dm1 (confirmed here), the Envy 17 (confirmed here), and the Pavilion G6 (confirmed here). I need to know whether this works on the HP Pavilion dv4t-4200 or -5100.