I confirm for Kubuntu 15.03 with 3.19.0-15-generic. With the hint #11 and #12 I 
could implement a workaround with discard enabled in fstab. Instead of 
deactivating the controller, I only disabled NCQ in  /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash libata.force=noncq"
After update-grub and reboot everything seems to work.

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

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

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