Second GPU inactive/no picture output

Hello everyone,
Just installed Garuda alongside windows (replacing manjaro), to hopefully get a bit more into linux as a main OS...
I have a dual-GPU (2x asus GTX1080ti) setup with 4 monitors. The problem is that monitors that are connected to the second GPU are detected in display settings, but no signal is output to them. Checking the "active" doesn't do much besides letting the screen to scroll to the area where the display should be when the cursor moves offscreen.

garuda-inxi output:

System:
Kernel: 5.19.13-zen1-1-zen arch: x86_64 bits: 64 compiler: gcc v: 12.2.0
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen
root=UUID=e14018aa-7aaa-4ccf-a346-18848002dd77 rw [email protected]
splash rd.udev.log_priority=3 vt.global_cursor_default=0 loglevel=3
Console: pty pts/0 wm: kwin_x11 DM: SDDM Distro: Garuda Linux
base: Arch Linux
Machine:
Type: Desktop Mobo: ASUSTeK model: ROG STRIX Z370-E GAMING v: Rev X.0x
serial: <filter> UEFI: American Megatrends v: 3004 date: 07/12/2021
Battery:
ID-1: hidpp_battery_1 charge: 100% condition: N/A volts: 4.2 min: N/A
model: Logitech G903 LIGHTSPEED Wireless Gaming Mouse w/ HERO type: N/A
serial: <filter> status: N/A
ID-2: hidpp_battery_3 charge: 100% condition: N/A volts: 4.2 min: N/A
model: Logitech G903 LIGHTSPEED Wireless Gaming Mouse w/ HERO type: N/A
serial: <filter> status: charging
CPU:
Info: model: Intel Core i7-8700K socket: LGA1151 bits: 64 type: MT MCP
arch: Coffee Lake gen: core 8 level: v3 note: check built: 2018
process: Intel 14nm family: 6 model-id: 0x9E (158) stepping: 0xA (10)
microcode: 0xF0
Topology: cpus: 1x cores: 6 tpc: 2 threads: 12 smt: enabled cache:
L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 1.5 MiB desc: 6x256 KiB
L3: 12 MiB desc: 1x12 MiB
Speed (MHz): avg: 3883 high: 4801 min/max: 800/4900 base/boost: 3700/8300
scaling: driver: intel_pstate governor: performance volts: 1.1 V
ext-clock: 100 MHz cores: 1: 3700 2: 3700 3: 4800 4: 3700 5: 3700 6: 3700
7: 3700 8: 3700 9: 3700 10: 3700 11: 3700 12: 4801 bogomips: 88796
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Vulnerabilities:
Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT
vulnerable
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown mitigation: PTI
Type: mmio_stale_data mitigation: Clear CPU buffers; SMT vulnerable
Type: retbleed mitigation: IBRS
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
sanitization
Type: spectre_v2 mitigation: IBRS, IBPB: conditional, RSB filling,
PBRSB-eIBRS: Not affected
Type: srbds mitigation: Microcode
Type: tsx_async_abort mitigation: TSX disabled
Graphics:
Device-1: NVIDIA GP102 [GeForce GTX 1080 Ti] vendor: ASUSTeK driver: nvidia
v: 515.76 alternate: nouveau,nvidia_drm non-free: 515.xx+ status: current
(as of 2022-10) arch: Pascal code: GP10x process: TSMC 16nm
built: 2016-21 pcie: gen: 3 speed: 8 GT/s lanes: 8 link-max: lanes: 16
bus-ID: 01:00.0 chip-ID: 10de:1b06 class-ID: 0300
Device-2: NVIDIA GP102 [GeForce GTX 1080 Ti] vendor: ASUSTeK
driver: nvidia v: 515.76 alternate: nouveau,nvidia_drm non-free: 515.xx+
status: current (as of 2022-10) arch: Pascal code: GP10x
process: TSMC 16nm built: 2016-21 pcie: gen: 1 speed: 2.5 GT/s lanes: 8
link-max: gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 02:00.0
chip-ID: 10de:1b06 class-ID: 0300
Display: x11 server: X.Org v: 21.1.4 with: Xwayland v: 22.1.3
compositor: kwin_x11 driver: X: loaded: nvidia unloaded: modesetting
alternate: fbdev,nouveau,nv,vesa gpu: nvidia,nvidia display-ID: :0
screens: 1
Screen-1: 0 s-res: 5120x2520 s-dpi: 107 s-size: 1216x598mm (47.87x23.54")
s-diag: 1355mm (53.35")
Monitor-1: DP-1-2 size-res: N/A modes: N/A
Monitor-2: DP-2 pos: bottom-l res: 2560x1440 dpi: 109
size: 597x336mm (23.5x13.23") diag: 685mm (26.97") modes: N/A
Monitor-3: HDMI-0 pos: top-right res: 1920x1080 hz: 60 dpi: 69
size: 708x398mm (27.87x15.67") diag: 812mm (31.98") modes: N/A
Monitor-4: HDMI-1 pos: primary,bottom-r res: 2560x1440 dpi: 93
size: 697x392mm (27.44x15.43") diag: 800mm (31.48") modes: N/A
OpenGL: renderer: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA
515.76 direct render: Yes
Audio:
Device-1: Intel 200 Series PCH HD Audio vendor: ASUSTeK
driver: snd_hda_intel v: kernel bus-ID: 1-6.3.4.1:14 bus-ID: 00:1f.3
chip-ID: 0951:171d chip-ID: 8086:a2f0 class-ID: 0300 serial: <filter>
class-ID: 0403
Device-2: NVIDIA GP102 HDMI Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 8 link-max: lanes: 16
bus-ID: 01:00.1 chip-ID: 10de:10ef class-ID: 0403
Device-3: NVIDIA GP102 HDMI Audio vendor: ASUSTeK driver: snd_hda_intel
v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 8 link-max: gen: 3
speed: 8 GT/s lanes: 16 bus-ID: 02:00.1 chip-ID: 10de:10ef class-ID: 0403
Device-4: Kingston HyperX QuadCast S type: USB
driver: hid-generic,snd-usb-audio,usbhid
Sound API: ALSA v: k5.19.13-zen1-1-zen running: yes
Sound Server-1: PulseAudio v: 16.1 running: no
Sound Server-2: PipeWire v: 0.3.59 running: yes
Network:
Device-1: Intel Ethernet I219-V vendor: ASUSTeK driver: e1000e v: kernel
port: N/A bus-ID: 00:1f.6 chip-ID: 8086:15b8 class-ID: 0200
IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: Realtek RTL8822BE 802.11a/b/g/n/ac WiFi adapter vendor: ASUSTeK
driver: rtw_8822be v: N/A modules: rtw88_8822be pcie: gen: 1
speed: 2.5 GT/s lanes: 1 port: c000 bus-ID: 05:00.0 chip-ID: 10ec:b822
class-ID: 0280
IF: wlp5s0 state: down mac: <filter>
IF-ID-1: anbox0 state: down mac: <filter>
Bluetooth:
Device-1: ASUSTek Bluetooth Radio type: USB driver: btusb v: 0.8
bus-ID: 1-7:3 chip-ID: 0b05:185c class-ID: e001 serial: <filter>
Report: bt-adapter ID: hci0 rfk-id: 0 state: up address: <filter>
Drives:
Local Storage: total: 3.18 TiB used: 28.43 GiB (0.9%)
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung model: SSD 960 EVO
500GB size: 465.76 GiB block-size: physical: 512 B logical: 512 B
speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter> rev: 3B7QCXE7
temp: 40.9 C scheme: GPT
SMART: yes health: PASSED on: 2y 252d 13h cycles: 337
read-units: 310,639,626 [159 TB] written-units: 71,132,484 [36.4 TB]
ID-2: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 860 EVO 1TB
family: based SSDs size: 931.51 GiB block-size: physical: 512 B
logical: 512 B sata: 3.1 speed: 6.0 Gb/s type: SSD serial: <filter>
rev: 1B6Q temp: 29 C scheme: GPT
SMART: yes state: enabled health: PASSED on: 4y 183d 7h cycles: 336
written: 5.68 TiB
ID-3: /dev/sdb maj-min: 8:16 vendor: Seagate model: ST2000DX002-2DV164
family: FireCuda 3.5 size: 1.82 TiB block-size: physical: 4096 B
logical: 512 B sata: 3.1 speed: 6.0 Gb/s type: HDD rpm: 7200
serial: <filter> rev: CC41 temp: 42 C scheme: GPT
SMART: yes state: enabled health: PASSED on: 4y 182d 21h cycles: 336
read: 159 TiB written: 5.39 TiB Pre-Fail: attribute: Spin_Retry_Count
value: 100 worst: 100 threshold: 97
Partition:
ID-1: / raw-size: 95.91 GiB size: 95.91 GiB (100.00%) used: 27.22 GiB
(28.4%) fs: btrfs block-size: 4096 B dev: /dev/nvme0n1p7 maj-min: 259:7
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) used: 608 KiB
(0.2%) fs: vfat block-size: 512 B dev: /dev/nvme0n1p8 maj-min: 259:8
ID-3: /home raw-size: 199.62 GiB size: 199.62 GiB (100.00%) used: 130.2
MiB (0.1%) fs: btrfs block-size: 4096 B dev: /dev/sdb3 maj-min: 8:19
ID-4: /opt raw-size: 200.32 GiB size: 200.32 GiB (100.00%) used: 1.08 GiB
(0.5%) fs: btrfs block-size: 4096 B dev: /dev/sda3 maj-min: 8:3
ID-5: /var/log raw-size: 95.91 GiB size: 95.91 GiB (100.00%) used: 27.22
GiB (28.4%) fs: btrfs block-size: 4096 B dev: /dev/nvme0n1p7
maj-min: 259:7
ID-6: /var/tmp raw-size: 95.91 GiB size: 95.91 GiB (100.00%) used: 27.22
GiB (28.4%) fs: btrfs block-size: 4096 B dev: /dev/nvme0n1p7
maj-min: 259:7
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: zram size: 31.28 GiB used: 1.2 MiB (0.0%)
priority: 100 dev: /dev/zram0
ID-2: swap-2 type: partition size: 31.3 GiB used: 0 KiB (0.0%)
priority: -2 dev: /dev/nvme0n1p6 maj-min: 259:6
Sensors:
System Temperatures: cpu: 34.0 C mobo: N/A gpu: nvidia temp: 56 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 20%
Info:
Processes: 343 Uptime: 1h 16m wakeups: 16 Memory: 31.28 GiB used: 5.06 GiB
(16.2%) Init: systemd v: 251 default: graphical tool: systemctl
Compilers: gcc: 12.2.0 clang: 14.0.6 Packages: pm: pacman pkgs: 2080
libs: 563 tools: octopi,pamac,paru Shell: garuda-inxi (sudo) default: Bash
v: 5.1.16 running-in: konsole inxi: 3.3.22
Garuda (2.6.8-1):
System install date:     2022-10-13
Last full system update: 2022-10-13
Is partially upgraded:   No
Relevant software:       NetworkManager
Windows dual boot:       Yes
Snapshots:               Snapper
Failed units:            systemd-networkd-wait-online.service

This setup did work on Manjaro, I don't remember if I got it to work manually or if it worked after merely updating the drivers.
I feel like there is something really simple I'm missing, but I'm failing to find any relevant information by searching around here, arch forums or search engines.
I auto-installed the proprietary drivers with the mhwd, which was probably done by the installer/updater anyway :sweat_smile: after reboot it didn't change anything.

Small update, it seems to have to do with the X configuration?... I messed with the nvidia-settings app and managed to get the display on the second GPU to display the login screen, but then it was black with the mouse cursor stuck (a cross) on it. It would only allow it to be on a different X screen, though, which messes with my arrangement.

Either way, the GPU is working and it can output signal to the display, but I guess I have to make a custom config for it?...

I will try to document further attempts to solve the problem if it maybe helps someone else. I don't think I will change the title (I will maybe add to it when the problem is solved) for now, as what's in the title describes the problem I was having as I saw it.

Can you describe more precisely what changes you made that yielded this result?

Paste what you've got so far into the thread if it would be helpful for someone else to look it over for you.

4 Likes

I enabled the display as a new X screen. The other displays were on X screen 0, while the other went on X screen 1. After that I rebooted, as I wasn't sure how to restart the X server without it :sweat_smile: After reboot, I had the login screen, but after logging in the monitor was black with the stuck cross cursor.

Dumping the xorg.conf (I feel like nvidia-settings was being more cooperative now than before) - the displays aren't arranged quite right, but the monitor is now getting signal and the cursor can be moved on/off it. It is overlapping with another display.

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 520.56.06

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
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      "SONY TV"
    HorizSync       14.0 - 70.0
    VertRefresh     48.0 - 62.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "GBT G32QC A"
    HorizSync       243.0 - 243.0
    VertRefresh     48.0 - 165.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:2:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-3"
    Option         "metamodes" "HDMI-0: nvidia-auto-select +1709+0, DP-0: nvidia-auto-select +2560+1080, DP-2: 2560x1440_120 +0+1080"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "nvidia-auto-select +0+0 {AllowGSYNC=Off}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

view of nvidia-settings:


When I move the cursor off the rightmost screen, it appears where you'd expect, the border being where it is.
I cannot move any windows to the other X screen, though.

edit - looking a bit closer, I see SLI and multi-GPU options that are off. I do have the cards connected with the SLI bridge. What do those options do?

edit2 - completely random question - two of the displays have desktop backgrounds, while the other two don't (one being the one on the second GPU/X screen 1, other - on the first/X screen 0 along with the two that have backgrounds) and RMB on the desktop does nothing - how do I set the background for all displays? - this is probably material for a separate topic, though.

yet another edit - to specify, the stuff that shows up on the other-GPU display - not the login screen, but the animation after logging in and the shutdown menu.

edit4 (after next post) - enabling xinerama made the actual login screen appear on all displays, but when on desktop, the dock was gone, and the GBT only showed cursor. When I clicked there, the corners of the background popped up on the corners of the AOCs where they overlap, but there is/was nothing on the GBT - it was black. Now I reverted back to xinerama off.

I changed the layout of the displays to slightly closer resemble what I have IRL:
image
I can move the cursor from the GBT to sony, but not from sony to GBT. This is likely somewhat irrelevant to the issue of getting the displays to work as I want, I'm kind of keeping notes of what's happening here and issues I trip on :sweat_smile:

I DID IT
So basically, I used nvidia-xconfig -sli=mosaic and had to write out the appropriate metamodes manually-ish, but it ultimately worked EDIT: I think the key aspect was, as mentioned in the nvidia SLI link, was initially checking the box of the base mosaic (surround) with one monitor connected to each of the GPUs. The details I probably won't be able to type out all the way right now, if someone wants - I can try to help.
Probably most useful resources:

Very useful command for debugging/testing ("how to restart xorg server"): sudo kill Xorg
For me it sent me to the login screen (and closed all the windows), but if it drops you into console, I guess you can just run Xorg or sudo Xorg

Dumping my xorg.conf (this caused one of the displays to be disabled by default, but after manual enabling it worked fine):

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 520.56.06

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 520.56.06

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

Section "Files"
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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "AOC Q27G2WG4"
    HorizSync       230.0 - 230.0
    VertRefresh     48.0 - 144.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:2:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-5"
    Option         "metamodes" "GPU-ea8adf39-7871-d982-a587-489d4b642c33.DP-2: 2560x1440_120 +0+0, GPU-cdc2e66f-2280-2fa8-2b92-f9742f0eb8e2.DP-2: nvidia-auto-select +2560+0"
    Option         "MultiGPU" "Off"
    Option         "SLI" "off"
    Option         "BaseMosaic" "on"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "MetaModes" "GPU-0.DP-0: 2560x1440+0+0, GPU-0.DP-2: 2560x1440+1920+0, GPU-0.DVI-D-0: 1920x1080+2560+-1080, GPU-1.DP-2: 2560x1440+2560+0"
    Option         "MultiGPU" "mosaic"
    Option         "SLI" "mosaic"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

This one works now, though it seems to contain some UUID-looking things that almost certainly won't work for anyone else:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 520.56.06

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 520.56.06

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

Section "Files"
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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "SONY TV"
    HorizSync       14.0 - 70.0
    VertRefresh     48.0 - 62.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GTX 1080 Ti"
    BusID          "PCI:2:0:0"
EndSection

Section "Screen"

# Removed Option "MetaModes" "GPU-0.DP-0: 2560x1440+0+0, GPU-0.DP-2: 2560x1440+1920+0, GPU-0.DVI-D-0: 1920x1080+2560+-1080, GPU-1.DP-2: 2560x1440+2560+0"
# Removed Option "MultiGPU" "mosaic"
# Removed Option "SLI" "mosaic"
# Removed Option "metamodes" "GPU-ea8adf39-7871-d982-a587-489d4b642c33.DP-2: 2560x1440_120 +0+0"
# Removed Option "metamodes" "GPU-ea8adf39-7871-d982-a587-489d4b642c33.DP-2: 2560x1440_120 +0+0, GPU-cdc2e66f-2280-2fa8-2b92-f9742f0eb8e2.DP-2: nvidia-auto-select +2560+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-5"
    Option         "metamodes" "GPU-ea8adf39-7871-d982-a587-489d4b642c33.GPU-0.DVI-D-0: nvidia-auto-select +2560+0, GPU-ea8adf39-7871-d982-a587-489d4b642c33.GPU-0.DP-2: 2560x1440_120 +0+1080, GPU-cdc2e66f-2280-2fa8-2b92-f9742f0eb8e2.GPU-1.DP-2: 2560x1440_165 +2560+1080, GPU-ea8adf39-7871-d982-a587-489d4b642c33.GPU-0.DP-0: nvidia-auto-select +5120+1080"
    Option         "MultiGPU" "Off"
    Option         "SLI" "off"
    Option         "BaseMosaic" "on"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "MetaModes" "GPU-0.DP-0: 2560x1440+0+0, GPU-0.DP-2: 2560x1440+1920+0, GPU-0.DVI-D-0: 1920x1080+2560+-1080, GPU-1.DP-2: 2560x1440+2560+0"
    Option         "MultiGPU" "mosaic"
    Option         "SLI" "mosaic"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

I couldn't edit my messages more than once... I undeleted this one for the changes in the xorg.conf to be visible.
The first one disabled one of the displays, making me have to manually enable it after a reboot.

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