[fritsch]

You did not - cause the howto does _not_ use Ubuntu Mate _at all_ - you use the packages from the howto, yeah - but that's it.

Now to your issue:
Your issue is known and not fixed by intel: https://bugs.freedesktop.org/show_bug.cgi?id=88012

Solution: Install a kernel 3.16.x (yes an old and outdated one).

Code:

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16.7-utopic/linux-headers-3.16.7-031607-generic_3.16.7-031607.201410301735_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16.7-utopic/linux-headers-3.16.7-031607_3.16.7-031607.201410301735_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16.7-utopic/linux-image-3.16.7-031607-generic_3.16.7-031607.201410301735_amd64.deb
sudo dpkg -i *3.16.7*deb

Then you need to make sure that grub boots exactly this kernel. This is an issue on all Baytrail Quad core systems.