You'll need to post some log messages anyway, as what is pertinent might
be rather subtle.

See this page:
https://wiki.ubuntu.com/X/Debugging

Paste in output of lspci -nn | grep VGA
Attach /etc/X11/xorg.conf
Attach /var/log/Xorg.0.log
Attach output of lspci -vvnn 

if it crashes, reboot and attach  /var/log/Xorg.0.log.old

Does it also occur if DRI is disabled?

-- 
Possible severe conflict between intel X server and Broadcom wifi
https://bugs.launchpad.net/bugs/154647
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