Since nvidia460 is installed one monitor is there

Question

I have a two monitor screen connected, but since the update of the Nvidia 460 I can only use one monitor, and the other monitor is black. When I reset it to Nouveau both screens are there. What can I do to get this back?

xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+  59.94    50.00  
   1680x1050     59.95  
   1600x1200     60.00  
   1440x900      59.89  
   1280x1024     60.02  
   1280x960      60.00  
   1280x720      59.94    50.00  
   1152x720      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       59.94    59.93
nvidia-settings: X configuration file generated by nvidia-settings
nvidia-settings:  version 440.82
Section "ServerLayout"
Removed Option "Xinerama" "0"
Removed Option "Xinerama" "1"
Identifier     "Layout0"
Screen      0  "Screen0" 0 0
Screen      1  "Screen1" 2049 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      "Idek Iiyama PLX2483H"
HorizSync       30.0 - 83.0
VertRefresh     55.0 - 76.0
Option         "DPMS"

EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier     "Monitor1"
VendorName     "Unknown"
ModelName      "Idek Iiyama PLX2481H"
HorizSync       30.0 - 83.0
VertRefresh     55.0 - 76.0
Option         "DPMS"

EndSection
Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 1650"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection
Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 1650"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection
Section "Screen"
Removed Option "metamodes" "HDMI-0: nvidia-auto-select +0+0"
Removed Option "metamodes" "HDMI-0: 1920x1080_60 +0+0"
Identifier     "Screen0"
Device         "Device0"
Monitor        "Monitor0"
DefaultDepth    24
Option         "Stereo" "0"
Option         "nvidiaXineramaInfoOrder" "DFP-2"
Option         "metamodes" "HDMI-0: nvidia-auto-select +0+0"
Option         "SLI" "Off"
Option         "MultiGPU" "Off"
Option         "BaseMosaic" "off"
SubSection     "Display"
    Depth       24
EndSubSection

EndSection
Section "Screen"
Removed Option "metamodes" "HDMI-1: nvidia-auto-select +0+0 {AllowGSYNC=Off}"
Removed Option "metamodes" "HDMI-1: nvidia-auto-select +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On, AllowGSYNC=Off}"
Removed Option "metamodes" "HDMI-1: nvidia-auto-select +0+0 {AllowGSYNC=Off}"
Removed Option "metamodes" "HDMI-1: 1920x1080_60_0 +0+0 {AllowGSYNC=Off}"
Removed Option "metamodes" "HDMI-1: nvidia-auto-select +0+0 {AllowGSYNC=Off}"
Removed Option "metamodes" "HDMI-1: 1920x1080_60 +0+0 {AllowGSYNC=Off}"
Identifier     "Screen1"
Device         "Device1"
Monitor        "Monitor1"
DefaultDepth    24
Option         "Stereo" "0"
Option         "nvidiaXineramaInfoOrder" "DFP-3"
Option         "metamodes" "HDMI-1: nvidia-auto-select +0+0 {AllowGSYNC=Off}"
Option         "SLI" "Off"
Option         "MultiGPU" "Off"
Option         "BaseMosaic" "off"
SubSection     "Display"
    Depth       24
EndSubSection

EndSection
Section "Extensions"
    Option         "(null)" "Disable"
EndSection

Answer 1

I had a similar issue with my three screen setup. Surprisingly, the solution was to change the refresh frequency of one of the screens. The only way I could get all 3 screens to work was to set one of them to 59.xx Hz instead of 60Hz. I'm not sure why this happens, and the logs didn't seem to help.