Problem with prime-run

[XRaTiX]

Do you use KDE? You need an additional step when you install optimus manager to make it work.

GitHub - Askannz/optimus-manager: A Linux program to handle GPU switching on...

Manjaro ships with a default configuration for SDDM (the default login manager for KDE) which overrides some keys needed by optimus-manager. To use optimus-manager, you need to edit the file /etc/sddm.conf and simply put a # before the line starting with DisplayCommand and the one starting with DisplayStopCommand.

Also with GNOME:

The default gdm package from the Archlinux and Manjaro repositories is not compatible with optimus-manager, so you must replace it with this patched version : gdm-prime (also replaces libgdm). The patch was written by Canonical for Ubuntu and simply adds two script entry points specifically for Prime switching. The package is otherwise identical to the official one.