I have a graphics workstation with two Quadro RTX 4000 graphics cards. OS=Ubuntu 22.04.5 LTS kernel=6.5.0-18-generation, graphics card driver is NVIDIA Linux-x86_64-550.135.run.
I have 4 4K monitors, with two monitors connected to each graphics card.
When I use the nvidia settings command, I can see four displays, two of which are disabled. At this point, I enabled the Basemosaic option in the advanced options and enabled the two displays. After saving the configuration, I restarted the workstation, but none of the four displays displayed. So I used the grep nvidia/etc/modprobe. d//lib/modprobe. d/ command to change the modeset to 0, and set iommu=off in grub. Then update initramfs - u and update grub and restart the workstation, and I can see the graphical desktop. At this point, when I open Nvidia settings, I can only see two monitors, which belong to the same graphics card. The other graphics card is missing in Nvidia settings. This makes it impossible for me to use Mosaic across graphics cards for splicing and synthesizing displays. How should this be resolved and set up? Thank you.
nvidia-bug-report.log.gz (693.0 KB)
after enable mosaic，in nvidia-settings can only be seen one graphics card,but in nvidia-smi there are two rtx40000