two graphics cards not recognised by KDE

English Hardware
1

So I have two graphics cards, and the kernel recognises both (it says: if you want this screen to be primary, press…) However, the moment I go into the full boot stage, it just disables the second card. xrandr doesn’t report anything for the second card. It just has the two ports of the first card. List providers though has a more interesting result:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 297mm
   1920x1080     60.00*+
   1600x900      60.00
   1280x1024     75.02    60.02
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
   720x400       70.08
DP-2 disconnected (normal left inverted right x axis y axis)
foo:~ # xrandr --listproviders
Providers: number : 2
Provider 0: id: 0xb3; cap: 0x7 (Source Output, Sink Output, Source Offload); crtcs: 2; outputs: 2; associated providers: 0; name: nouveau
    output DP-1
    output DP-2
Provider 1: id: 0x63; cap: 0x7 (Source Output, Sink Output, Source Offload); crtcs: 2; outputs: 2; associated providers: 0; name: nouveau
    output 0x61
    output 0x62

How do I make the second card work so I can use my four monitors.

2

Looks to be NVIDIA cards. You did not say.

Maybe best to use the proprietary NVIDIA driver it has a setting program???

Also did not say what desktop but there are Desktop setting to configure multiple monitors, but where and how are Desktop dependent

3

Yeah, seems to be something with the latest version of the nouveau driver. It was working since the display ports on the second card would show up as “dp-1.1” and “.2”.
I am using KDE as a desktop environment. The kde “display” tool shows nothing about a second card.
Again, two cards, with two ports each. Kernel recognizes both cards at boot (even in Grub stage). KDE (Xorg) only sees one card as of a few months ago. Second port on primary card is recognized correctly.

foo:~ # lspci|grep -i vga
03:00.0 VGA compatible controller: NVIDIA Corporation GF119 [NVS 310] (rev a1)
04:00.0 VGA compatible controller: NVIDIA Corporation GF119 [NVS 310] (rev a1)