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[Mark Rein <gimpsmart@xxxxxxxxxxxx>]

The exact same bug also affects the 850 PRO: http://www.spinics.net/lists/linux-ide/msg50342.html
Originally, they came with EXM01B6Q, which reports "I do NOT support NCQ TRIM!".
Then, samsung released EXM02B6Q, which wrongly reports "I SUPPORT NCQ TRIM!", but of course they don't; the data corrupts if you try.

Samsung then pulled EXM02B6Q from their website for a DIFFERENT issue:
The firmware update bricked many devices. But the problem is that new
850 PROs from the factory come with the new, buggy firmware
preinstalled. And Samsung are not yet aware that their NCQ TRIM is
buggy.

I have contacted Samsung via their regular tech support form and pointed out the NCQ TRIM bug and hopefully they will fix it. I also know that Martin K. Petersen from Oracle has contacts at Samsung and is talking to them to get it resolved in their firmware, see here:
http://permalink.gmane.org/gmane.linux.ide/59802
(Full thread: http://comments.gmane.org/gmane.linux.ide/59791)

I hope Samsung will get on this swiftly, and at least release an
intermediary firmware which disables NCQ TRIM until they're ready to re-
add it.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Confirmed
Status in fstrim source package in Trusty:
  Invalid
Status in linux source package in Trusty:
  Confirmed
Status in fstrim source package in Utopic:
  Invalid
Status in linux source package in Utopic:
  Confirmed
Status in fstrim source package in Vivid:
  Invalid
Status in linux source package in Vivid:
  Confirmed

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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