Public bug reported:
ystem Details:
OS: Ubuntu 24.04.3 LTS
Kernel: 6.14.0-34-generic
NVIDIA Driver: 580.95.05
GPU: NVIDIA GeForce RTX 3060 Ti (PCI:01:00.0)
Motherboard: [CPU with onboard GPU at PCI:10:00.0]
Display Managers: lightdm
Desktop Environment: GNOME (ubuntu-xorg session)
Connected Displays:
HDMI-2: 1920x1080
DP-4: 2560x1440
DP-5: 2560x1440
Issue:
X11 session starts successfully
NVIDIA kernel modules load: nvidia_uvm, nvidia_drm, nvidia_modeset
xrandr correctly detects all 3 monitors and outputs configuration
Screenshots render correctly to all monitors
But: Physical monitors receive no video signal - blank screens with no display
output
Workaround:
Wayland session works perfectly with all 3 monitors displaying correctly
Using xrandr --auto to mirror displays sometimes provides partial signal
Manual xrandr positioning commands execute without error but don't restore
signal
Key Observations:
Identical hardware boots other Ubuntu 24.04.3 LTS on separate drive - all 3
monitors work immediately without configuration
Issue persists after: driver reinstall, xorg.conf regeneration, kernel update
DRM device detection: /dev/dri/card1 and /dev/dri/card2 created correctly
Xorg.0.log shows successful initialization of nvidia-drm but no display output
errors
Dual GPU system (NVIDIA discrete + AMD onboard) - AMD GPU is blacklisted,
doesn't affect issue
Steps to Reproduce:
Install Ubuntu 24.04.3 with NVIDIA 580 driver
Connect 3 displays to NVIDIA RTX 3060 Ti outputs
Boot to X11 session
Observe blank displays despite xrandr showing correct configuration
Expected Behavior:
All 3 monitors should display X11 desktop immediately upon login, as they do in
Wayland session and on other OSes.
Actual Behavior:
X11 session runs but produces no video output to any monitor.
Logs:
dmesg | grep nvidia - shows successful module loading
cat /var/log/Xorg.0.log - shows successful X server initialization
xrandr --query - shows all monitors connected with correct resolutions/positions
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2130926
Title:
Ubuntu 24.04.3 LTS X11 session does not display properly
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