Debian Server – No Video Output

The Problem

A while back, I set up a home-server on an old spare PC running Debian 13. The install is (mostly) headless, so I don’t have Wayland or X11 installed, and don’t plan to do so.

When I plug a Monitor into the machine itself to do some work on it, I can’t get any output on my monitor. If I then reboot, the Monitor works as expected, until I unplug and then later re-plug it. The graphical output is on a GTX 1050Ti, and my Motherboard has no graphics port I could use to test / fall back to.

Order of Events

I boot up the server with a Monitor plugged into my GPU’s HDMI or DP output, and I get an output as expected. I can progress past the bios, grub, as well as to the login, and use the machine as normal. I then unplug the monitor, and plug it back into on of the ports, but get no output. The monitor itself output something like “No signal”, not just a blank output.

What I tried already

  • I tried switching tty‘s with Ctrl+Alt+F1-12.
  • NVidia drivers are installed and working correctly (tested via nvidia-smi), and modeset is already set to Y.

Possible solutions not fitting this case

  • X11 can force a rescan of displays with xrandr.