Looks like you have Nvidia Optimus card. I assume you have Bumblebee installed. If not, there is a detailed guide about installing it on any Arch-based system:
With Bumblebee installed, Nvidia Optimus computers ALWAYS run on Intel GPU. Nvidia GPU is NEVER used by default.
If you want to run some program on Nvidia GPU, you must do it explicitely, with
optirun [optirun-parameters] program [program-parameters]
nvidia-settings is used for both simple (single-GPU) and advanced (hybrid GPUs) Nvidia cards. It is NEVER configured automatically to run correctly on Optimus cards. The correct command to execute
nvidia-settings on Optimus card is given in the above mentioned guide.
nvidia-xconfig tool is a perfect Bumblebee killer. It is meant and works for single-GPU Nvidia cards only. If you run it at least once on Nvidia Optimus, it will immediately destroy Bumblebee configuration.
nvidia-xconfig is automatically installed during Bumblebee installation. To be safe, it’s better to uninstall it. It serves for nothing on Optimus computers.