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Holger avatar Ubuntu

Access third monitor on 21.04 w/ Nvidia NVS 315. Live USB works, installed not

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Holger

My desktop contains two NVS 315 graphic cards with three displays attached. I was running kubuntu 20.04 and used them as shared screen. I am not sure how it worked, but I remember making it work was a pain. I think Xinerama with two X screens, one with two, one with one display. After setting it up, there where no related issues.

Now I started a fresh install of ubuntu 21.04 for other reasons. When I boot into the live USB and start using it, the three screens work perfectly. All are recognized, I can rearrange them, assign the main screen etc. When I install the system and boot into it, only two screens are recognized using the nouveau drivers. The third becomes visible when I switch to the nvidia-driver-390. When I then activate it as X screen 1, it remains black, but I can move my mouse into it (the pointer turns into an X). When I enable Mosaic or Xinerama, rebooting results into ugly crashes and I have to boot into a shell and remove, revert the xorg.conf. And here I are again, in two-screen mode.

The earlier question (In 18.04, Third monitor works from live USB, but not from HDD) points towards removing and reinstalling the Nvidia drivers and I tried random order variations, but no real success yet.

How can I obtain the nice and working configuration of the initial boot from USB? What else should / can I try? Thanks!

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