Comment 8 for bug 1507255

Under Ubuntu-Mate 15.04 only my wallpaper, scroll-sliders, and right window edges were garbled.
After do-release-upgrade to 15.10 all of the things are hashed garbled tearing whatever, even the text, even inside terminal windows.

Cory Davis (corzneffect) is correct;
Downgrading the video acceleration from "sna" to "uxa" works as a temporary fix:

#Create a config file;
sudo nano /usr/share/X11/xorg.conf.d/20-intel.conf

#Add the following lines
Section "Device"
   Identifier "Intel Graphics"
   Driver "intel"
   Option "AccelMethod" "uxa"
EndSection

#reboot