我想让 MacPro 5.1 与我的两张 NVIDIA 1080 Ti 显卡配合使用。我还安装了原装 9500GT，因此我能够安装 Ubuntu 和 NVIDIA 驱动程序。我从 9500GT 中获得了图片，但没有从 1080 Ti 显卡中获得图片。Nvidia X 服务器窗口完全是空的。nvidia-smi 显示两张卡，如下所示，所以我认为问题不应该出在驱动程序上。
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 |
+-----------------------------------------------------------------------------+
我注意到MacBook Pro、EFI 和 Nvidia setpci ID但是由于 NVIDIA 可以识别卡，所以这也许不是问题？
我该如何解决这个问题并从 1080 Ti 卡获取视频？
编辑1
我正在运行 GDM Ubuntu 19.10。我更新了最新的 440 驱动程序并拔出了 9500GT 卡。我在第二个 1080ti 上连接了 2x30 英寸显示器。当我没有 9500 启动时，我再也看不到图像了。当登录屏幕出现时，我看到第二个显示器激活了，但又失去了连接。我尝试在 grub 中添加 nomodeset，就像一些教程中要求的那样，但没有帮助。当我拔出 9500 时，唯一的变化是，nvidia-smi 现在提供了一些正在运行的进程。
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 |
+-----------------------------------------------------------------------------+
编辑2
看来 sudo get-edid | parse-edid 获取监视器信息（4k 监视器）
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
编辑3。
我成功了！真是愚蠢又业余的错误，我不得不将电缆换到第二台 1080ti。现在两台显示器都获得 4k 分辨率了！