Comment 3 for bug 1865323

I modified lightdm-gtk-greeter to put more debug messages in and found that the delay starts sometime after lightdm-gtk-greeter closes. I'm trying to do the same thing with lightdm to see where the black screen delay starts, but I'm having trouble getting my modified lightdm to replace lightdm.

I'm not sure if this is helpful, but I found that if I install light-locker then the black screen delay also happens when I choose to lock the screen. If I uninstall light-locker then only "switch user/unlock" causes delay and "lock/unlock" displays desktop immediately like stated in original post.