Ubuntu stopped recognizing second Display Port monitor

Support and Help
, , ,
1

Ubuntu Version:
Ubuntu 25.04

Desktop Environment (if applicable):
ubuntu:GNOME

Problem Description:
I have two monitors over display port that have been working for months. Ubuntu has stopped talking to or recognizing the second one after a restart. the monitor in question works with display port with another computer plugged in. Ubuntu will recognize it over both the mother board and gpu HDMI ports, just not a GPU DisplayPort.

Relevant System Information:
9800X3D
Nvidia 4090
nvidia-driver-575 (there are several older versions listed, im not sure which it is using)

What I’ve Tried:
just ruling out bad monitor or cables. im not sure how to force ubuntu to talk to a monitor it does not want to.

2

further checking. I opened NVtop and the Nvidia gpu is not showing. just the integrated AMD gpu. booted into my windows installation and the gpu is reporting fine. so ill go recheck the nvidia driver.

3

this was fixed by

ubuntu-drivers autoinstall

1 Like
4

Same problem, nothing changed with

sudo apt-get update
sudo apt-get upgrade

but FIXED with:

sudo apt update
sudo apt upgrade

5

Thank you. I couldn’t figure out what was going on this morning when I booted up my computer and the displays were not working. I have 2 Dell S2417DG monitors connected to DP and a 3rd portable monitor I use connected to HDMI.

In the past I’ve had issues with power save mode activating on the dell monitors and not waking back up. I tried resetting the monitors and using their built in calibrations and nothing would work. Then I found this post and simply did an update and I’m back in action.

6

This topic was automatically closed 3 days after the last reply. New replies are no longer allowed.