I find this problem is usually triggered by something I do in LibreOffice.
Using LO 5.0.1
Ubuntu 15.04-64bit
Intel i5 CPU M 520
LO content not affected (picture attached)
Chrome content not affected (but title bar is)
Firefox, Gedit, Files are all affected.
** Attachment added: "text2.png"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1342675/+attachment/4467116/+files/text2.png
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https://bugs.launchpad.net/bugs/1342675
Title:
Random characters in screen text suddenly disappear
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