After some further research,  we would need to backport quite a few
commits to get the fixes from v3.19-rc1 into utopic.  It would probably
be too many changes for a stable release.  At this point, the following
commits would be needed, just to get abd69c5 to apply:

144ecb9 drm: Add atomic driver interface definitions for objects
cc4ceb4 drm: Global atomic state handling
2f324b4 drm/crtc-helper: Transitional functions using atomic plane helpers
623369e drm: Atomic crtc/connector updates using crtc/plane helper interfaces
abd69c5 drm: Handle atomic state properly in kms getfoo ioctl

Vivid will get all of these commits when it is rebased to upstream 3.19.

For Utopic it may be easier to perform a bisect to find the commit that
started causing this issue, that is if it is indeed a regression.  Can
anyone affected by this bug report that they had a prior kernel that did
not exhibit this bug?

** Also affects: linux (Ubuntu Vivid)
   Importance: High
       Status: Confirmed

** Also affects: plymouth (Ubuntu Vivid)
   Importance: High
     Assignee: Mathieu Trudel-Lapierre (mathieu-tl)
       Status: Triaged

** Also affects: linux (Ubuntu Utopic)
   Importance: Undecided
       Status: New

** Also affects: plymouth (Ubuntu Utopic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Utopic)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Utopic)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1359689

Title:
  cryptsetup password prompt not shown

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