I get the same thing with kernel 4.18.x. The current implementation of the service fails on muxless optimus. Also if one turns off the GPU using /sys/bus/pci, GDM will still not boot up even if the prime boot service would succeed.
I get the same thing with kernel 4.18.x. The current implementation of the service fails on muxless optimus. Also if one turns off the GPU using /sys/bus/pci, GDM will still not boot up even if the prime boot service would succeed.