Thanks a lot, 14.04.1 made the trick.
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https://bugs.launchpad.net/bugs/1484045
Title:
Version of xorg reported on lauchpad does not match wath is installed
with 14.04.03 LTS
To manag
They point release media installs a backport of the graphics stack from
newer releases so they work on newer devices
(https://launchpad.net/ubuntu/+source/xorg-server-lts-vivid being used
in 14.04.3), to go back to the 14.04.1 version just install xserver-
xorg-lts-trusty or use 14.04.1 install med
