NVIDIA graphic card only HDMI working

I have a DELL G5 15 with GeForce GTX-1050 Ti . NVIDIA proprietary drivers are installed:

nvidia-smi

Wed Jun 10 09:44:27 2020       

+-----------------------------------------------------------------------------+

| NVIDIA-SMI 430.34       Driver Version: 430.34       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 105...  Off  | 00000000:01:00.0 Off |                  N/A |

| N/A   41C    P8    N/A /  N/A |      0MiB /  4040MiB |      0%      Default |

My /etc/X11/xorg.conf

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

# nvidia-xconfig:  version 430.34

Section "ServerLayout"

    Identifier     "Layout0"

    Screen      0  "Screen0" 0 0

    InputDevice    "Keyboard0" "CoreKeyboard"

    InputDevice    "Mouse0" "CorePointer"

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      "Unknown"

    Option         "DPMS"

EndSection

Section "Device"

    Identifier     "Device0"

    Driver         "nvidia"

    VendorName     "NVIDIA Corporation"

EndSection

Section "Screen"

    Identifier     "Screen0"

    Device         "Device0"

    Monitor        "Monitor0"

    DefaultDepth    24

    SubSection     "Display"

        Depth       24

    EndSubSection

EndSection

But only works the HDMI output not the screen laptop (only shows a black screen)

Any advise?

Thanks in advance

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