2nd Monitor not working all off a sudden

[daanheuvelbeuk]

Example: 22.04 LTS, 24.04, 25.10

GNOME

The other day I turned on my Ubuntu distribution and noticed my second monitor (screen, terminal, whatever) was not working anymore. It still works on Windows. Faulty cable?

FWIW, Displays in settings does not recognize second monitor either.
Example:

Open Settings → Displays
Try to change resolution
Screen goes black

Relevant System Information:
Include any details that might help (e.g., hardware, drivers, or special configurations).

Screenshots or Error Messages:

[celticwarrior]

How is the second monitor connected?

[daanheuvelbeuk]

I think I use HDMI cables

Edit:
I checked. I have 1 HDMI port, and 3 Displayport port. I use the HDMI port and 1 Displayport. The HDMI port is failing.

[peterwhite23]

Smells like an NVIDIA driver issue, but I can only speculate since someone failed to fill out the support template.

[daanheuvelbeuk]

Do you mean information like:

lspci -nnk | grep VGA -A1
2d:00.0 VGA compatible controller [0300]: NVIDIA Corporation GA104 [GeForce RTX 3060] [10de:2487] (rev a1)
	Subsystem: Micro-Star International Co., Ltd. [MSI] GA104 [GeForce RTX 3060] [1462:397d]