I can confirm Zanna's solution for the Acer B115 apt-get install linux-image-generic-lts-xenial linux-headers-generic-lts-xenial, resulting in kernel 4.4.0-15-generic solved the problem. So the 4.4.0.-13.7 and 3.19.0-56 are not ok, the 4.4.0-15-generic #31~14.04.1 is ok
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