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[CvB <1338706@xxxxxxxxxxxxxxxxxx>]

There are problems with the 850 Pro as well, see, e.g.:

http://ubuntuforums.org/showthread.php?t=2282808&p=13305283

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https://bugs.launchpad.net/bugs/1338706

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

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

Bug description:
  [Impact]

   * Users with Samsung 8** SSD drives see miscellaneous errors and
  warning messages in the logs depending on the firmware level of the
  drive while booting or after running trim.

  [Test Case]

   * Run this script, and then check logs for errors.
  #!/bin/bash

  git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  for i in {0..10} ; do
   cp -r linux linux$i
  done
  rm -rf linux*
  echo "sudo fstrim requires your password"
  sudo fstrim ./

  [Regression Potential]

   * There is very little regression potential as this change simply
  prevents NCQ trim from being used on Samsung 8** drives.

  [Other Info]

   * Commit is upstream.
   * Greatly increasing the timeout for the drives seems to relieve the timeout errors.  This may be due to trimming large numbers of sectors with single commands.  It may be prudent for future upstream to break up large trims into multiple requests on smaller regions.

  ===============Original Bug description ==================================
  Samsung SSD 840 Series failed to get NCQ Send/Recv Log Emask 0x1.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  user       2131 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jul  7 20:01:28 2014
  HibernationDevice: RESUME=UUID=685afcb7-7aa6-4048-af15-091d3bcd3b35
  InstallationDate: Installed on 2014-06-22 (14 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-30-generic root=UUID=d7c2e1cb-d046-460c-83b8-0cfbb330d095 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/10/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0901
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M3N78-EM
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0901:bd09/10/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM3N78-EM:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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