This happens to me too (still) : both VGA and DVI-D (cannot test HDMI).
This happens at both log-in and log-out.
DistroRelease: Ubuntu 16.04
Date: Sat Mar 10 2018
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Temporary black screen after login
Status in lightdm package in Ubuntu:
I turn on my laptop, wait lightdm appears, and do login to my user.
Sometimes i got a black screen, only cursor appears in the screen. I
can open a terminal with Ctrl+Alt+t, and run firefox using terminal,
for example. And it is possible to change tty. Then, after 30 seconds,
or more, like 1 minute, my desktop appears (background, unity
launcher, top panel...).
I'm having this problem in my asus laptop, that have nvidia optimus
(and can confirm with other, a sony laptop with only intel graphics
DistroRelease: Ubuntu 13.10
Package: lightdm 1.8.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-17.31-generic 126.96.36.199
Uname: Linux 3.11.0-17-generic x86_64
Date: Wed Feb 19 00:52:59 2014
InstallationDate: Installed on 2013-12-13 (67 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64
UpgradeStatus: No upgrade log present (probably fresh install)
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