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
I can confirm Zanna's solution for the Acer B115 generic- lts-xenial linux-headers- generic- lts-xenial, resulting in kernel 4.4.0-15-generic solved the problem.
apt-get install linux-image-
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