Chris, can you have a look to this one.
It is causing failing certification for some of the enabled systems for
10.10 (Including the T420 and T520).
This seems to be the master bug: bug 728101
** Changed in: xserver-xorg-video-intel (Ubuntu)
Assignee: (unassigned) => Chris Van Hoof (vanhoof)
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https://bugs.launchpad.net/bugs/773508
Title:
[ThinkPad T520] setting dpms off with xset causes X or Unity to freeze
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