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[binjarac <coppensmeister@xxxxxxxxx>]

During a fresh install today  (14.04.1 on Samsung 850 Pro) I also hit this bug.
I noticed the same issue on a 13.04 install on a Samsung 840 Pro (after fw upgrade) that I am running for quite some time now.
Allthough running fstrim manually is still working, I found this litte test which seems to work and confirm TRIM is active and working.
I thought I'd register and share this (hopefully) useful info with you. 
Run test as per description below:

http://techgage.com/article/enabling_and_testing_ssd_trim_support_under_linux/2/

Hope this shed some light on the matter....

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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:
  Incomplete

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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