I had the same problem on Samsung NP300E5V-S02IN. I solved it by upgrading the kernel as mentioned by Padraig and Stephane above (Thanks !!) (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1574125/comments/26 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1574125/comments/24)
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