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*** This bug is a duplicate of bug 1435951 ***
    https://bugs.launchpad.net/bugs/1435951

------- Comment From shigbhat@xxxxxxxxxx 2015-05-07 13:02 EDT-------
(In reply to comment #6)
> So just for clarification, when you mention 14.04.3 you mean the v3.19
> series kernel.
> If this is the case then only two patches are required:
>
> commit 92c83ff5b42b109c94fdeee53cb31f674f776d75
> commit a127d2bcf1fbc8c8e0b5cf0dab54f7d3ff50ce47

Yes. But both of them are back ported to 15.04.

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https://bugs.launchpad.net/bugs/1451825

Title:
  Add cpuidle-powernv upstream bug fixes and upstream patch to fix
  kernel regression due to cpuidle on to 14.04.03 kernel

Status in linux package in Ubuntu:
  New

Bug description:
  This is a feature request to include the following patches in 14.04.03
  kernel.

  [1] 74aa51b5ccd39753 cpuidle: powernv: Populate cpuidle state details by querying the device-tree 
  (3.18 upstream)

  [2] cpuidle/powernv: Read target_residency value of idle states from DT if available
  https://lkml.org/lkml/2015/2/3/23

  [3] tick/broadcast-hrtimer : Fix suspicious RCU usage in idle loop
  http://linuxppc.10917.n7.nabble.com/PATCH-tick-broadcast-hrtimer-Fix-suspicious-RCU-usage-in-idle-loop-td89675.html

  [1] and [2] patches provide fixes to read the latency and
  target_residency values of different idle states from the device tree
  if they are present in the device tree. This fix will avoid cpu from
  aggressively  entering into fastsleep.

  [3] is an important fix against a kernel regression down the cpuidle
  path which was reported in the community.

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