Disable internal/built-in Keyboard but let External Keyboard work

[unpocoloco]

I've got a laptop and its internal keyboard is malfunctioning.
So i've decided to buy an external usb keyboard, and it works fine.
What I want to do is disable the built-in keyboard because sometimes some keys get pressed/activated automatically.

I've tried disabling it from "Device management" but the option is grayed out.
I've tried disabling it from BIOS but many BIOS options got hidden by manufacturer.
I don't want to phisically unplug the keyboard inside the laptop because I don't want to break warranty.

I'm wondering if there is a way with hotkeys to disable/enable that built-in keyboards whenever I need to 
Any suggestion is appreciated...

 

one more thing I want to add:

I have tried many searching for answers. I got that, both the keyboards would be disabled because autoit hotkey does not detect which keyboard is doing it, it just detects the keys. so the keyboards  cant be differentiated.

but someone suggested me to use HID Macros. I don't know what is it but I know onething that  it can differentiate inputs from two different keyboards.

hope my searchings would help.
 

[Nine]

58 minutes ago, unpocoloco said:

I don't want to break warranty.

If it is still under warranty, why don't you simply return the laptop since kb is malfunctionning ?