This post is obsolete. Please check the new manual at this post
Install driver
Add negativo17’s repo
$ sudo dnf config-manager --add-repo=https://negativo17.org/repos/fedora-nvidia.repo
Install NVIDIA driver
$ sudo dnf install nvidia-driver nvidia-driver-libs.i686
Config DM
Create script file /usr/bin/xrandr-nvidia
#!/bin/sh
xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto
and add execute permission
$ sudo chmod +x /usr/bin/xrandr-nvidia
For SDDM, add the above script to /etc/sddm/Xsetup
#!/bin/sh
# Xsetup - run as root before the login dialog appears
/usr/bin/xrandr-nvidia
For LightDM, in /etc/lightdm/lightdm.conf find the section [Seat:*] and add the script
...
[Seat:*]
display-setup-script=/etc/lightdm/xrandr-nvidia
...