I have two monitors, after locking screen and new login attept to the system both monitors show me a black screen. It happens from time to time. What can i do?
$ uname -r 4.4.0-97-generic
$ lsb_release -a -u No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.3 LTS Release: 16.04 Codename: xenial
$ lsb_release -a No LSB modules are available. Distributor ID: elementary Description: elementary OS 0.4.1 Loki Release: 0.4.1 Codename: loki