Anyway, even without inxi it is already clear that you have Nvidia Optimus card.
You may either follow Antergos Wiki or use the excellent nvidia-installer utility, offered by Antergos. Nvidia-installer may be used to install proprietary Nvidia drivers for both single- and double-GPU Nvidia cards (your case).
It has only one weak point - it can’t manage BIOS settings on computers, where discrete video card is controlled by BIOS. In such a case it is possible to use this approach:
- change BIOS settings as described in AnteWiki, in preparation to Nvidia driver installation
- run nvidia-installer
- change BIOS back to the original discrete video card settings
BTW, your 940M card is reported in AnteWiki among those where Bumblebee and prop Nvidia were successfully installed on.