I am having a strange problem where LightDM refuses to work after I have logged out. To be clear, at boot, it rolls into LightDM just fine, I can see what user to choose, and have the option of choosing the DE, do so, then work, then log out, and then I just have a black screen. Switching to VT2 I can login at CLI and sudo reboot, but restarting the lightdm service doesn’t help at this point. I’d prefer to stick with lightdm because it works best with deepin/cinnamon/xfce that I use.
I have googled the issue, but not found anything similar. Ideas?
EDIT: I tried LXDM, and that wouldn’t even show at boot, although according to systemd it was running.
I have tried with the standard kernel and the -zen kernel, no difference. I am thinking it must be something to do with the optimus graphics on this laptop, where it is failing to switch modes.