When using a freshly imaged uSD card with Raspbian in my Raspberry Pi 4, after initial splash screens for setup/autoconfigure, I'm left with a black screen, with the text cursor blinking in the top left.
I can access and view/use TTYs fine (e.g. ctrl+alt+F2). If I restart the display manager,
sudo service lightdm restart, it takes me back to the aforementioned black screen.
- Raspberry Pi 4b (2GB RAM)
- running Raspbian (Debian Bullseye)
- with a DisplayLink monitor (either UM1000 Mimo Magic Monster, or the newer UM-1080C-G-NB Mimo Vue Touch Monitor) (USB port on the Pi does not seem to matter)
Some of the testing done
On another SD card, I was able to load and try various flavors of Ubuntu. These "just work", albeit are extremely slow and not really usable on this 2GB model. So I know the hardware is good/compatible. I've also used both of these screen models extensively for years on "regular" computers running Ubuntu 14 and 20.
In addition to restarting
lightdm, I also tried running
startx from the TTY. No change there.
This round of testing... is a repeat of similar testing I did about 6 months ago with an RPi 3b+ and had the same issues, which prompted my ordering the RPi 4. So this issue probably also applies to Raspbian on the 3b+.