No devices detected.
In some instances, running optirun will return:
[ERROR]Cannot access secondary GPU - error: [XORG] (EE) No devices detected.
[ERROR]Aborting because fallback start is disabled.
In this case, you will need to move the file /etc/X11/xorg.conf.d/20-intel.conf to somewhere else. Restart the bumblebeed daemon, and it should work.
Diese Datei hat es bei mir nie gegeben.
It could be also necessary to comment the driver line in /etc/X11/xorg.conf.d/10-monitor.conf.
If you're using the nouveau driver you could try switching to the nVidia driver.
Arch startet nur wenn ich den Intel-Treiber in dieser Datei setze. Beim Nvidia-Treiber startet nur die Shell. Oder mach ich was falsch?
Gruß
Gutscho