ubuntu 22.04.5 LTS，with two rtx A4000,Driver Version: 550.142.
I can see two graphics cards in nvidia-smi.
I connected two monitors to each graphics card, for a total of four monitors. I would like to enable the base mosaic mode in this situation and combine these 4 monitors into screen 0.There are currently two monitors with signal, while the other graphics card’s two monitors have no signal.
When I was using sudo nvidia-settings, I noticed that two monitors on one of the graphics cards were enabled and displaying normally, while the other two monitors on the other graphics card were disabled.
I clicked the advanced button, enabled base mosaic, enabled the other two displays to screen0, and then Apply.
And then I save to x configuration file ，no error reported.
I rebooted my workstation，or sudo service gdm3 restart，similarly, only two monitors have signals.
l execute sudo nvidia-settings again,it was found that only two monitors are still enabled, while the other two monitors are disabled. The ‘enable base mosaic’ option was not selected.
I checked the/etc/X11/xorg.cnf file and found the options “BaseMosaic” is “on”.
How can I open baseMosaic while using two graphics cards and four monitors?
I directly edited the/etc/X11/xorg.config file and modified the Options “SLI” “MOSAIC”, but it still doesn’t work. The other two displays are still in a disabled state.
nvidia-bug-report.log.gz (1.3 MB)