I've finaly found a solution!!
in the launchpad bug https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/151311
copy&paste of xhantt:
Other solution is to add the line
Option "DDC" "No"
to intel Device section of /etc/X11/xorg.conf.
I've finaly found a solution!!
in the launchpad bug https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/151311
copy&paste of xhantt:
Other solution is to add the line
Option "DDC" "No"
to intel Device section of /etc/X11/xorg.conf.