Black screen after installing optimus-manager

[brahma]

you have installed from AUR:

@ww1150

local/prime 1.0-14
    Nvidia:PRIME Render Offload Launcher

which is basically the same as this one from the official repos:

@ww1150

local/nvidia-prime 1.0-4
    NVIDIA Prime Render Offload configuration and utilities

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so remove the prime one from AUR, and install optimus as outlined here:

Trouble connecting monitor to laptop via HDMI

ok so the driver is being loaded… so install again optimus: edit your sddm.conf: kate /etc/sddm.conf and put a # before the line starting with DisplayCommand and the one starting with DisplayStopCommand - you may not have this display command lines there, so proceed with install: sudo pacman -S optimus-manager optimus-manager-plasma dont install any dependencies, only these 2 packages; reboot