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[Ioannis Vranos <1449005@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1338706 ***
    https://bugs.launchpad.net/bugs/1338706

@CJ, this bug is duplicate of bug #1338706.

The title of it, is:

"Samsung SSD 840 failed to get NCQ Send/Recv Log Emask 0x1 failed to set
xfermode (err_mask=0x40) on upstream kernels >= 3.12".

So I presume the bug affects kernels since version 3.12, and kernel 3.10
has not the bug.

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https://bugs.launchpad.net/bugs/1449005

Title:
  trim does not work with Samsung 840 EVO after firmware update
  (EXT0DB6Q)

Status in fstrim package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Fix Released
Status in fstrim source package in Trusty:
  Invalid
Status in linux source package in Trusty:
  Fix Committed
Status in fstrim source package in Utopic:
  Invalid
Status in linux source package in Utopic:
  Fix Committed
Status in fstrim source package in Vivid:
  Invalid
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  Hi,
  after updating Samsung SSD 840 EVO to the latest firmware (EXT0DB6Q) the fstream command doesn't work anymore. Besides, there are a lot of file system errors and "bad sectors" reports. The problem is certainly caused by Samsung's firmware but I reported it as a bug because in Windows TRIM works normally after the upgrade. I have attached an image uploaded by a user who is experiencing the same problem. If you execute the command "sudo fstrim /" the  console gets stuck. If you add that command in rc.local the boot is compromised. I really hope this problem could be solved.
  Thanks

  ===
  break-fix: - 6fc4d97a4987c5d247655a157a9377996626221a
  break-fix: - 9a9324d3969678d44b330e1230ad2c8ae67acf81

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