Problem turned out to be faulty memory. Please see: https://bugs.freedesktop.org/show_bug.cgi?id=30637
The others I raised with different issues were possibly also this problem: 599223 590282. Though they are closed should I send a similar email to those? Sorry for raising the bugs but as per xorg bug I had done extensive testing of the memory with no issues in memtest86+. Thanks, M -- To UNSUBSCRIBE, email to debian-x-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/aed086810014548418d6c84e6df9b29e.squir...@luminoussheep.net