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--set-startup won't work

See original GitHub issue

The command sudo optimus-manager --set-startup nvidia does not work for me. Switching manually with optimus-manager --switch nvidia works, though. I am using Arch Linux with kernel 4.19.2-arch1-1, nvidia-410.73-3, lightdm-1:1.28.0-1, xfce4 4.12.1-8 and optimus-manager-0.2-2.

$ cat /etc/X11/xorg.conf.d/10-optimus-manager.conf 
Section "Module"
	Load "modesetting"
EndSection

Section "Device"
	Identifier "nvidia"
	Driver "nvidia"
	BusID "01:00:0"
	Option "AllowEmptyInitialConfiguration"
	Option "Coolbits" "28"
	Option "DRI" "3"
EndSection

$ cat /etc/lightdm/lightdm.conf.d/10-optimus-manager.conf 
[Seat:*]
display-setup-script=/usr/bin/optimus-manager_Xsetup

$ systemctl status optimus-manager.service
● optimus-manager.service - Optimus Manager
   Loaded: loaded (/usr/lib/systemd/system/optimus-manager.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2018-11-20 17:35:58 CET; 14min ago
 Main PID: 567 (python)
    Tasks: 1 (limit: 4915)
   Memory: 30.5M
   CGroup: /system.slice/optimus-manager.service
           └─567 /usr/bin/python -u /usr/bin/optimus-manager-daemon --startup

Nov 20 17:35:59 arch python[567]: Error : Cannot find /usr/share/sddm/scripts/Xsetup
Nov 20 17:35:59 arch python[567]: Awaiting commands
Nov 20 17:36:26 arch python[567]: Received command : nvidia
Nov 20 17:36:26 arch python[567]: Stopping login manager
Nov 20 17:36:26 arch python[567]: Switching to Nvidia
Nov 20 17:36:26 arch python[567]: Loading Nvidia modules
Nov 20 17:36:26 arch python[567]: Configuring Xorg...
Nov 20 17:36:26 arch python[567]: Configuring login managers..
Nov 20 17:36:26 arch python[567]:         Configuring LightDM
Nov 20 17:36:26 arch python[567]: Restarting login manager

As you can see, I switched the mode manually which shows up in the systemd status report. I also tried creating the configuration /etc/optimus-manager.conf with this content:

[optimus]
login_manager=lightdm

I thought the script couldn’t find out I am using lightdm, but this also didn’t work. X11 config’s are cleaned up, bumblebeed.service is disabled and the bbswitch module isn’t loaded.