I have a fresh install of Fedora 29 LXDE on an HP Z800 with nVidia Quadro 4000 [displayport] in place. One display comes up fine; the second does not get a signal. I'm a developer and so need dual displays [was using a Lenovo system with dual display before but that system not available in new office].

I tried using the display preferences in preferences --> monitor settings, but it did not seem to even detect the second display.

I was following the nVidia driver-install guide at if-not-true-then-false.com/2015/fedora-nvidia-guide , but when I got to section 2.6.2 "edit /etc/sysconfig/conf" [after blacklisting nouveau], I discovered that I had no sysconfig directory in /etc .

Likewise, when I tried to skip that step and edit grub2.cnf , I saw that the file says at the top 'DO NOT EDIT THIS FILE!' so I figured I better not.

I know this nvidia driver business is a common issue, but I searched on this site and elsewhere and can't seem to find any documentation that will steer me in the right direction. Any assistance will be much appreciated!

when you run lspci do you see the video card?
when you run sudo lshw | grep display do you see the display controller?

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to add, what does say?

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Thanks for the help, folks! I sure appreciate it.

lspci shows the card :
0f:00.0 VGA compatible controller: NVIDIA Corporation GF100GL [Quadro 4000] (rev a3)

sudo lshw | grep display gives only :
*-display


here is the output of xrandr -q :
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DVI-I-1 disconnected primary (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 59.96 60.00 50.00 59.94 59.93 24.00 23.98
1920x1200 59.95
1920x1080i 60.00 50.00 59.94
1600x1200 65.00 60.00
1680x1050 59.95 59.88
1400x1050 74.76 59.98
1600x900 59.95 59.82
1280x1024 75.02 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00
1280x720 60.00 59.99 59.86 60.00 50.00 59.94 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
720x576 50.00
720x576i 50.00
700x525 74.76 59.98
800x450 59.95 59.82
720x480 60.00 59.94
720x480i 60.00 59.94
640x512 75.02 60.02
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
640x400 59.88 59.98
576x432 75.00
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32

Odd that dp-2 is working but not dp-1. Did you try any other ports?

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the only other port available on the card is DVI; I don't have a DVI cable handy at the moment. Good observation about the dp2 / dp1 -- I'll see what happens if I swap the displays / ports around and report back

When I switched the display / port configuration, I got no video on either display -- do you think it's just a bad dp1 port on the card?

p.s. I also tried swapping out the dp cables [from used to new ones I had on hand] -- no change in result

It’s possible it I wouldn’t rule that out just yet. Which driver did you download?

I downloaded

NVIDIA-Linux-x86_64-390.87.run

using nvidia's selection tool on their site. However, as far as I am aware, that driver is not active / installed in my system yet due to aborted install process as described in original post.

can you verify does each monitor work if singly plugged in?
are you able to try the DVI port?
also, you may wish to reload an earlier version of the NVidia driver
try
sudo lshw | grep -A10 display
the -A10 flag shows the line where "display" is found plus the next 10 lines (another flag is -Bn which shows n lines before the found text)

Confirmed that both displays work singly

Can't try DVI port at the moment, but I've ordered in a DVI cable that should be here in a couple of days to rectify that

Here is the output of sudo lshw | grep -A10 display [p.s. thanks for the tip re : -Ax flag, that will come in handy!]

*-display
description: VGA compatible controller
product: GF100GL [Quadro 4000]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:0f:00.0
version: a3
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0

Alright so the driver isn't installed. So let's work on that.
First we need to work from cli so do
and reboot.
Once rebooted and logged in Download dkms. after that installs run the nvidia.run script. And if everything goes as it should set the gui back up
and reboot

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Did this get solved?

Sorry for the slow followup- i've been out of the office sick a couple days- will try the steps above when i get in tomorrow - thanks again for your help and patience!

OK, tried a DVI --> HDMI cable from the DVI output on the card to the HDMI input on the display; no dice -- trying 1nuxg33k's driver install process now