30nvidia.conf

# ft=conf
Section "ServerLayout"
    Identifier "layout"
    Screen 1 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration"
    # Uncomment this line if your computer has no display devices connected to
    # the NVIDIA GPU.  Leave it commented if you have display devices
    # connected to the NVIDIA GPU that you would like to use.
    Option "UseDisplayDevice" "none"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
    #Driver "modesetting"
	BusID "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

how_to_optimus.txt

How to Enable NVIDIA Optimus
============================

Author: Naoki Mizuno (NigoroJr)
Written: 2016-11-29

This quick how-to is a guide on how to enable NVIDIA Optimus without using
Bumblebee. This has worked on my hardware but it is not guaranteed that it will
work on any computer.

Put the following code snippet as 30nvidia.conf in /etc/X11/xorg.conf.d/ after
adjusting the BusID. Make sure you have nvidia-drivers and
x11-drivers/xf86-video-intel and VIDEO_CARD in make.conf set to "nvidia
intel".

# ft=conf
Section "ServerLayout"
    Identifier "layout"
    Screen 1 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration"
    # Uncomment this line if your computer has no display devices connected to
    # the NVIDIA GPU.  Leave it commented if you have display devices
    # connected to the NVIDIA GPU that you would like to use.
    Option "UseDisplayDevice" "none"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
	BusID "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

In your .xinitrc (for startx; probably better considering the caveats written
in the next section) or .xsession put the following line:

xrandr --setprovideroutputsource Intel NVIDIA-0
xrandr --output HDMI1 --primary --auto --output eDP1 --right-of HDMI1 --auto

Don't forget to adjust the output names and the options according to your
configurations.

Caveats
-------

The display manager (like SLiM, KDM, GDM etc.) will probably not work (i.e.
will show a blank screen) because xrandr is only run after the login. In SLiM,
you might be able to set the sessionstart_cmd. Even when the login screen is
black it will still accept inputs and you will be able to login if you input
the correct username and password.

There also seems to be a problem regarding monitor refreshing and sometimes
there are black parts on the built-in moniter. This goes away if you make a
movement in that moniter.

References
----------

Some useful webpages when configuring:

https://forums.gentoo.org/viewtopic-p-7309924.html
https://wiki.gentoo.org/wiki/NVIDIA/Optimus/xorg.conf
https://wiki.archlinux.org/index.php/NVIDIA_Optimus