Lenovo Ideapad 520S looses second screen capability
Lenovo Ideapad 520S-14IKB regularly loses the second screen capability. An external monitor doesn't display anything, and Windows does not detect the second screen at all. This laptop has two display adapters: Intel HD Graphics 620 and Nvidia GeForce 940MX. The laptop BIOS automatically determines when and for which applications to use the more powerful (and more power-hungry) NVIDIA adapter.