Fixed by
commit ece4a17d237a79f63fbfaf3f724a12b6d500555c
Author: Jiri Kosina <jkos...@suse.cz>
Date:   Thu Aug 7 16:29:53 2014 +0200

    drm/i915: read HEAD register back in init_ring_common() to enforce
ordering

(In reply to comment #102)
> Will Linux 3.16.2 include this fix/workaround?

It will eventually be backported to supported stable kernels, but when
that happens depends on the stable team.

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https://bugs.launchpad.net/bugs/1339939

Title:
  [Lenovo ThinkPad T400] intel graphics fail after suspend with 3.16
  kernel

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