VGA not detected

If I plugin a VGA device, xrandr --query doesn't recognize it and shows "VGA-1-1 disconnected".

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: nvidia-384 384.90-0ubuntu3.17.10.1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
Date: Tue Nov 14 07:32:24 2017
InstallationDate: Installed on 2016-05-18 (544 days ago)
InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420)
JournalErrors:
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
SourcePackage: nvidia-graphics-drivers-384
UpgradeStatus: Upgraded to artful on 2017-10-16 (28 days ago)