Actully I don't experiment the bug any more beacuse as suggest by Georgi and 
Mark in the bug 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1510970 
I created the file /usr/share/X11/xorg.conf.d/20-intel.conf with the follwing 
content:
Section "Device"
        Identifier "Card0"
        Driver "Intel"
        Option "AccelMethod" "uxa"
EndSection


this switch from sna to uxa.

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https://bugs.launchpad.net/bugs/1519823

Title:
  regular crash of X. lightdm is shown after crash

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