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** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone

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https://bugs.launchpad.net/bugs/1335645

Title:
  pending patch breaks xgene-ahci

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  In Progress

Bug description:
  The following patch queued in trusty master-next introduces a
  regression in the xgene-ahci driver.

  commit 65e4c0de0b260fbd756d14f4df3bed694dcc52c0
  Author: Dan Williams <dan.j.williams@xxxxxxxxx>
  Date:   Thu Apr 17 11:48:21 2014 -0700

      libata/ahci: accommodate tag ordered controllers
      
      BugLink: http://bugs.launchpad.net/bugs/1333837
      
      commit 8a4aeec8d2d6a3edeffbdfae451cdf05cbf0fefd upstream.

  
  This issue is documented here:
    http://marc.info/?l=linux-kernel&m=140195842716315&w=2

  There are patches in flight that resolve this problem - these are what I've been tested with.
    http://kernel.ubuntu.com/git?p=dannf/ubuntu-utopic-hyperscale.git;a=commit;h=bf8081785ddecfab928ced266cfb1092440da9c9
    http://kernel.ubuntu.com/git?p=dannf/ubuntu-utopic-hyperscale.git;a=commit;h=9d182209b4c6be7cde703e235e99177215202366

  These patches also resolve the issue - but they are not yet upstream,
  so I'm assuming that a revert for now is the more maintainable
  solution.

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