Bsrgvty

I have installed a 18.04 LTS Ubuntu on my Acer Aspire VN7-592G. This laptop is equipped with a Nvidia discrete graphic card, the GTX960M.
In the following, you will find the lspci result (grepping 3D and VGA):

01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)

As the driver is concerned, I have installed the Nvidia 390.116 drivers found on the Ubuntu repo.
Now, my problem is: I cannot see any external display attached to my HDMI port.

The result of the xrandr command is the following:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 346mm x 194mm
 3840x2160 60.00 + 59.98 59.97 
 3200x1800 59.96 59.94 
 2880x1620 59.96 59.97 
 2560x1600 59.99 59.97 
 2560x1440 59.99 59.99 59.96 59.95 
 2048x1536 60.00 
 1920x1440 60.00 
 1856x1392 60.01 
 1792x1344 60.01 
 2048x1152 59.99 59.98 59.90 59.91 
 1920x1200 59.88 59.95 
 1920x1080 60.01 59.97 59.96* 59.93 
 1600x1200 60.00 
 1680x1050 59.95 59.88 
 1600x1024 60.17 
 1400x1050 59.98 
 1600x900 59.99 59.94 59.95 59.82 
 1280x1024 60.02 
 1440x900 59.89 
 1400x900 59.96 59.88 
 1280x960 60.00 
 1440x810 60.00 59.97 
 1368x768 59.88 59.85 
 1360x768 59.80 59.96 
 1280x800 59.99 59.97 59.81 59.91 
 1152x864 60.00 
 1280x720 60.00 59.99 59.86 59.74 
 1024x768 60.04 60.00 
 960x720 60.00 
 928x696 60.05 
 896x672 60.01 
 1024x576 59.95 59.96 59.90 59.82 
 960x600 59.93 60.00 
 960x540 59.96 59.99 59.63 59.82 
 800x600 60.00 60.32 56.25 
 840x525 60.01 59.88 
 864x486 59.92 59.57 
 800x512 60.17 
 700x525 59.98 
 800x450 59.95 59.82 
 640x512 60.02 
 720x450 59.89 
 700x450 59.96 59.88 
 640x480 60.00 59.94 
 720x405 59.51 58.99 
 684x384 59.88 59.85 
 680x384 59.80 59.96 
 640x400 59.88 59.98 
 576x432 60.06 
 640x360 59.86 59.83 59.84 59.32 
 512x384 60.00 
 512x288 60.00 59.92 
 480x270 59.63 59.82 
 400x300 60.32 56.34 
 432x243 59.92 59.57 
 320x240 60.05 
 360x202 59.51 59.13 
 320x180 59.84 59.32 
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

In a previous installation, I tried to switch to lightdm, to Wayland, to "addmode" to xrandr and activate the mode manually (as suggested in https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1771185).
Nothing worked.

Any suggestion?

Thank you!

It seems that I've found a solution after drinking a cold beer and reading this:

https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1771185/comments/26

The installation removed my xserver-xorg inputs. So, after installing the package suggested in the previous link, I issued the following:

 sudo apt install xserver-xorg-input-all

Now it works!!