Comment 35 for bug 1575000

Also affects 14.04 where I kept getting missing letters, or missing icons when using latest 4.4 kernel. It didn't happen earlier so I downgraded to 4.2-lts wily kernel. And yes I checked the memory was not faulty.

There's been quite a bit of talk about the Linux 4.4 version having a bug with Intel driver with graphics corruption or missing letters on the screen:

http://www.spinics.net/lists/intel-gfx/msg82135.html

https://bbs.archlinux.org/viewtopic.php?id=209065