Bug#834460: systemd/udev upgrade causes X black screen

[Laurent Bigonville]

On Tue, 16 Aug 2016 10:36:55 +1200 Ben Caradoc-Davies <ben at transient.nz> 
wrote:
 > Dear Maintainer,

Hi,

 > apt upgrade to systemd/udev 231-2 and apt upgrade to systemd/udev 
231-3 both
 > caused X to go black (except for a blinking cursor, looked like a console
 > tty?).
 >
 > Workaround is to switch to a virtual console with Ctrl-Alt-F1 and 
then back to
 > X with Alt-F7, which restores the X session.

I can reproduce this by running "systemctl daemon-reexec"

I would say this is a duplicate of bug #834367