I've rebuilt lightdm 1.18.3-1 from Stretch on my Jessie desktop and after a few VT-to-X switches some data is still stuck between lightdm and X.
--8<---------------cut here---------------start------------->8---
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
u_str ESTAB 384 0 * 20164523 *
20167969 users:(("lightdm",pid=21965,fd=11))
u_str ESTAB 0 9216 @/tmp/.X11-unix/X0 20167969 *
20164523 users:(("Xorg",pid=21969,fd=18))
--8<---------------cut here---------------end--------------->8---
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Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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