Trusty Tahr mount ext4 with data=writeback fails as bad option

I've read through + tried solutions mentioned in many postings about this problem.

Much of the information conflicts + nothing I've tried allows setting data=writeback in mount options.

1114G1# lsb_release -sd
Ubuntu 14.04 LTS

1114G1# uname -mrs
Linux 3.13.0-24-generic x86_64

This works...

    mount -o remount,defaults,noatime,nodiratime,nobh,barrier=0 /

This fails...

    mount -o remount,defaults,noatime,nodiratime,nobh,barrier=0,data=writeback,commit=500 /

Likely I'm missing something simple + have polluted my brain reading to many posts to think clearly.

Someone let me know how to fix this.

I've also tried turning on the writeback journal, which has no effect... Currently this is turned on...

1114G1# tune2fs -l /dev/sda2 |grep -i journal
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Default mount options: journal_data_writeback user_xattr acl
Journal inode: 8
Journal backup: inode blocks