Bug#802811: Plasma 5 does not start

[olivier <olivier.bald@gmail.com>]

Dear maintainer,

I have  same problem. After the day's update (Stretch  - 10/27/15), 
plasma session doesn't start and i have this message (dmesg):
sddm-greeter[1144]: segfault at 0 ip 00007f1a42a60a74 sp 
00007ffee597c3d0 error 4 in libxcb.so.1.1.0[7f1a42a56000+21000]

OS information
Debian GNU/Linux stretch/sid
Linux turing 4.2.0-1-amd64 #1 SMP Debian 4.2.3-2 (2015-10-14) x86_64 
GNU/Linux

Package version
libqt5x11extras5:
  Installé : 5.5.1-2
  Candidat : 5.5.1-2
 Table de version :
 *** 5.5.1-2 0
        500 http://ftp2.fr.debian.org/debian/ stretch/main amd64 Packages
        100 /var/lib/dpkg/status
Best regards,

Olivier Bald