test packages for both utopic (x-x-v-i) and trusty (x-x-v-i-lts-utopic)
http://koti.kapsi.fi/~tjaalton/bdw
the hint about external monitor was the key, bisected it down to
commit 0532a3313ad9c76a6e1d28e8a1c2ea495583fead
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Wed Nov 5 20:11:54 2014 +0000
sna/gen8: Clear instancing enabled bit between batches
** Changed in: xserver-xorg-video-intel (Ubuntu Utopic)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1432194
Title:
Graphics unstable on Ubuntu 14.04 and 14.10 using Intel HD Graphics
5500
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