Same problem for me on Ubuntu 24.04 fresh install on X11.
I tried updating my nvidia driver to nvidia-driver-550, but I keep
getting this "phantom" monitor in Gnome settings.
I have two physical monitors :
- Main one : AOC 27" AG271QG with G-Sync
- Other one : Dell 25"
$ find /sys/devices -name "edid"
/sys/devices/platform/simple-framebuffer.0/drm/card0/card0-Unknown-1/edid
/sys/devices/pci0000:00/0000:00:03.1/0000:0e:00.0/drm/card1/card1-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:03.1/0000:0e:00.0/drm/card1/card1-DP-2/edid
/sys/devices/pci0000:00/0000:00:03.1/0000:0e:00.0/drm/card1/card1-Unknown-2/edid
/sys/devices/pci0000:00/0000:00:03.1/0000:0e:00.0/drm/card1/card1-DP-3/edid
/sys/devices/pci0000:00/0000:00:03.1/0000:0e:00.0/drm/card1/card1-DP-1/edid
[ Workaround ]
I type in terminal : sudo rm -f /dev/dri/card0
*After relogin : Phantom monitor has disappeared, but I lost my monitors'
configuration (Main becoming second and vice versa, losing refresh rate too for
the AOC).
No sign of the phantom screen in Gnome settings.
/dev/dri$ ls -l
total 0
drwxr-xr-x 2 root root 100 avril 28 14:52 by-path
crw-rw----+ 1 root video 226, 1 avril 28 14:52 card1
crw-rw----+ 1 root render 226, 128 avril 28 14:52 renderD128
I set my monitors like before (refresh rate at 144Hz and main monitor
for the AOC), and reboot.
* After rebooting : phantom monitor is there again in Gnome settings. I
kept my monitors' configuration.
/dev/dri$ ls -l
total 0
drwxr-xr-x 2 root root 100 avril 28 15:21 by-path
crw-rw----+ 1 root video 226, 0 avril 28 15:21 card0
crw-rw----+ 1 root video 226, 1 avril 28 15:21 card1
crw-rw----+ 1 root render 226, 128 avril 28 15:21 renderD128
Other informations about my PC :
# Rapport d’informations du système
---
## Détails du compte rendu
- **Date de génération :** 2024-04-28 15:07:02
## Informations liées au matériel :
- **Modèle du matériel :** ASRock X570 Taichi
- **Mémoire :** 32,0 Gio
- **Processeur :** AMD Ryzen™ 7 5800X3D × 16
- **Carte graphique :** NVIDIA GeForce RTX™ 2080
- **Capacité du disque :** 8,5 To
## Informations liées au logiciel :
- **Version du micrologiciel :** P5.01
- **Nom du système d’exploitation :** Ubuntu 24.04 LTS
- **Construction du système d’exploitation :** (null)
- **Type de système d’exploitation :** 64 bits
- **Version de GNOME :** 46
- **Système de fenêtrage :** X11
- **Version du noyau :** Linux 6.8.0-31-generic
** Also affects: nvidia-graphics-drivers-550 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2060268
Title:
Phantom "Unknown Display" shown in Settings after installing the
Nvidia driver
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