I want to get MacPro 5.1 working with my two NVIDIA 1080 Ti cards. I have the original 9500GT installed as well, so i was able to install Ubuntu and NVIDIA drivers. I get a picture out from 9500GT but not from the 1080 Ti cards. Nvidia X server window is totally empty. nvidia-smi shows both cards, as shown below, so i think the problem shouldn't be the drivers.
MacPro:/$ nvidia-smi
Tue Apr 7 11:08:41 2020
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 435.21 Driver Version: 435.21 CUDA Version: 10.1 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 108... Off | 00000000:05:00.0 Off | N/A |
| 0% 34C P5 20W / 280W | 0MiB / 11178MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 1 GeForce GTX 108... Off | 00000000:06:00.0 Off | N/A |
| 0% 33C P5 27W / 280W | 0MiB / 11178MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+
I noticed MacBook Pro, EFI and Nvidia setpci IDs but since NVIDIA recognize cards, perhaps this should't be the problem?
How may I troubleshoot this and get video from the 1080 Ti cards?
Edit.1
I'm runing GDM Ubuntu 19.10. I updated latest 440 drivers and pulled 9500GT card out. I have 2x30in monitors attached in the second 1080ti. When i boot without 9500, I dont get image anymore. When login screen should come, i see that second monitor activates but lost connection again. I have tried add nomodeset in then grub as in some tutorials ask but no help. Only thing what changed when I pulled 9500 out, nvidia-smi gives some running process now.
Tue Apr 7 12:42:13 2020
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.64 Driver Version: 440.64 CUDA Version: 10.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 108... Off | 00000000:05:00.0 Off | N/A |
| 0% 34C P8 16W / 280W | 16MiB / 11178MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 1 GeForce GTX 108... Off | 00000000:06:00.0 Off | N/A |
| 0% 33C P8 17W / 280W | 2MiB / 11178MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 1218 G /usr/lib/xorg/Xorg 9MiB |
| 0 1295 G /usr/bin/gnome-shell 3MiB |
+-----------------------------------------------------------------------------+
Edit.2
It seems that sudo get-edid | parse-edid gets monitor info (4k monitor)
Section "Monitor"
Identifier "U32J59x"
ModelName "U32J59x"
VendorName "SAM"
# Monitor Manufactured week 1 of 2019
# EDID version 1.3
# Digital Display
DisplaySize 700 390
Gamma 2.20
Option "DPMS" "true"
Horizsync 30-135
VertRefresh 24-75
# Maximum pixel clock is 600MHz
#Not giving standard mode: 1152x864, 75Hz
#Not giving standard mode: 1280x800, 60Hz
#Not giving standard mode: 1280x720, 60Hz
#Not giving standard mode: 1280x1024, 60Hz
#Not giving standard mode: 1440x900, 60Hz
#Not giving standard mode: 1600x900, 60Hz
#Not giving standard mode: 1680x1050, 60Hz
#Extension block found. Parsing...
#WARNING: I may have missed a mode (CEA mode 97)
#DOUBLE WARNING: It's your first mode, too, so this may actually be important.
#WARNING: I may have missed a mode (CEA mode 95)
#WARNING: I may have missed a mode (CEA mode 96)
#WARNING: I may have missed a mode (CEA mode 93)
#WARNING: I may have missed a mode (CEA mode 94)
Modeline "Mode 1" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
Modeline "Mode 0" 594.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
Modeline "Mode 2" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 3" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
Modeline "Mode 4" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 5" 74.250 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 6" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 7" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 8" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 9" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 10" 148.50 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 11" 297.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
Modeline "Mode 12" 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync
Option "PreferredMode" "Mode 1"
EndSection
Edit3.
I got it work! Stupid thing and amateur mistake, I had to change cables to second 1080ti. Now both monitors get 4k resolution!
