Blank screen instead of greeter after locking my laptop


Since a software update a couple of weeks ago I’ve had a really annoying problem on my work laptop. Basically, whenever I lock the laptop the screen goes blank instead of showing the greeter and I can’t log back in. No input seems to work at all, except for Ctrl+Alt+F# to switch to a tty.

I don’t know exactly which software it was that was updated right before this started happening.
I suspect it’s related to LightDM or the greeter but I’m not sure. I have looked at logs but not found anything that made sense to me, and I’ve tried reinstalling both the greeter and LightDM to no avail. Switching to a different LightDM greeter also does not help (tested with lightdm-gtk-greeter and lightdm-slick-greeter).

I don’t know enough about Linux to debug this further so I’d appreciate some help. :slight_smile:

OS: Manjaro XFCE 20.2
Kernel: 5.8.18-1 (booted without ucode, because it doesn’t boot otherwise)
Laptop: Dell Latitude 5500
CPU: Intel i7-8665U