Bug#827131: xserver-xorg-video-intel: user connot login in kde

[Jürgen Bausa]

I now found out which option is causing the trouble:

If I use 'Xrender' on the 'Erweitert' Tab of 'Arbeitsflächen-Effekte 
einrichten' 
in 'Systemeinstellungen' in KDE, I cannot login to KDE.

Switching to 'OpenGL 3.1' allows me to login again.

Jürgen