Closing lid turns off external monitor on 16.04

NOTE: Don't rush to mark as duplicate - most of the similar questions consider very old Ubuntu versions and their answers are not applicable.

I have Lenovo T460s with the latest Ubuntu 16.04. I like my lid closed when it's docked / connected to external monitors. However the moment I close the lid, the external monitors are turned off as well.

What I did so far:

• Set "Do nothing" in "When the lid is closed" line of Power settings
• Verified that #HandleLidSwitchDocked=ignore exists in /etc/systemd/logind.conf (tried uncommenting and restarting - did not change anything)
• Set my monitor LCD screen to OFF (when other monitors are connected)
• In "Brightness&Lock", "Lock" is off, and "Turn screen off when inactive for" is set to 30 minutes

The external monitor(s) turn off in Kernel 4.4.0-135. However in Kernel 4.13.0-36 the external monitor(s) simply reset and set Brightness to 1.00 and Gamma to 1.0:1.0:1.0.

Upgrading kernel would be the simplest way of solving the issue.

As the other answer mentioned simply moving the mouse will wake up the external monitors when using Kernel 4.4.0-135.