Public bug reported:
Steps to reproduce:
1. Connect 2 external monitors via 2 different interfaces (e.g. type-c or/and
hmdi or/and display port).
2. Attempt to boot.
Note: the issue is reproducible not only on laptops, but on PCs as well
(for example by connecting one monitor via HDMI and the other via DP).
Connecting monitors to motherboard instead of GPU doesn't resolve the
issue as well.
Result: The windows freeze and ubuntu desktop becomes inoperable.
Expected result: Ubuntu desktop works properly.
Below is the system information.
uname -r
6.11.0-21-generic
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.2 LTS
Release: 24.04
Codename: noble
$ nvidia-smi
Fri Apr 4 23:54:47 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 550.120 Driver Version: 550.120 CUDA
Version: 12.4 |
|-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A |
Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage |
GPU-Util Compute M. |
| | |
MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 4070 ... Off | 00000000:01:00.0 On |
N/A |
| N/A 36C P5 5W / 55W | 88MiB / 8188MiB |
6% Default |
| | |
N/A |
+-----------------------------------------+------------------------+----------------------+
+-----------------------------------------------------------------------------------------+
| Processes:
|
| GPU GI CI PID Type Process name
GPU Memory |
| ID ID
Usage |
|=========================================================================================|
| 0 N/A N/A 3298 G /usr/lib/xorg/Xorg
83MiB |
+-----------------------------------------------------------------------------------------+
$ lspci -nn | grep -E 'VGA|Display'
00:02.0 VGA compatible controller [0300]: Intel Corporation Raptor Lake-S
UHD Graphics [8086:a788] (rev 04)
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD106M
[GeForce RTX 4070 Max-Q / Mobile] [10de:2860] (rev a1)
My device is Lenovo Legion Pro5 (2024).
I also tested it on Arch with wayland/X11, Gnome/KDE - everything works
properly. It doesn't work on Ubuntu with Gnome and with both
wayland/X11. Some users on Reddit reported in my post that the issue
also occurs on AMD GPUs. Thus, it might be not specific to GPU, WM, or
DE. Reinstalling ubuntu drivers (after purging them) did not resolve the
issue.
Possible workarounds:
1. Boot with only one external display and connect the other afterwards
(doesn't matter which interface is used).
OR
2. Use another distro.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2114902
Title:
Ubuntu doesn't load with dual external monitors
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