Hi Folks!

I jumped ship from windows 10 recently and have installed KDE Neon after trying out Mint, Solar and a couple other distros. I've got a little bit of linux knowledge but not very hot on the X11 side of things. Hopefully someone can point me in the right direction on this - there's lots online about setting up dual or triple monitors but not much that's helpful to me

I've got 6 monitors (4 x 4k and 2 x 1440p) and 2 Nvidia cards (1070 and 980, man they suck in Linux lol). I've rearranged the monitors in Nvidia X Server Settings so that they are in a 2x2 grid instead of next to each other in a row (The 6 monitor config i'd like is 3 x 2 (3 monitors horizotally by 2 vertically)). The 4 monitor that are enabled appear to be all running off of 'X Screen 0' which running on the 1070.

So the 2 screens physically connected to the 980 are not used. I've tried turning on the 2 extra monitors and in Nvidia X Config they are both disabled. There is a dropdown list with the option to create 'New X Screen (requires X restart)'. I've tried this and it tries to create X Screen 1 but when I hit apply it gives the following error (my comments in parenthesis):

-------------------------------------------------------------------------------------------
- Location of an X screen has changed (not moved anything)
- location or type of an x screen has changed (possibly the new screen? not sure)
- the color depth of an x screen has changed (possibly the new screen? not sure)
- an x screen has been added or removed (the new screen!)
- xinerama is being enabled/disabled (xinerama is disabled)

For all the requested settings to take effect, you must save the configuration to the x config file and restart the x server. (i've not created an x config file yet)
-------------------------------------------------------------------------------------------

This is what the 'Save to X Configuration File' button in the Nvidia X Server Settings application churns out if I run it and hit preview (Doesn't look like it's got all the monitors in there to me?):

###########################
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 390.77 (buildd@lcy01-amd64-022) Thu Sep 6 07:51:39 UTC 2018

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "BenQ 241W"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 76.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 1070"
BusID "PCI:65:0:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-6"
Option "metamodes" "DVI-D-0: nvidia-auto-select +640+960, DP-0: nvidia-auto-select +2560+0, DP-2: 2560x1440_144 +0+2160, DP-4: nvidia-auto-select +2560+2160"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection

###########################

I'm not sure where this needs to be saved in KDE Neon so I've not tinkered with it or tried to edit it yet

Any help appreciated - happy to check documents but scared I'll end up down a rabbit hole if i'm on the wrong path and break something!

Thanks
Sunny

A)

Read this:

$ firefox /usr/share/doc/nvidia-*/html/index.html


B)

"Rabbit Hole"?

YES!!!


C)

Good Luck.