Comment 7 for bug 1403152

The patch mentioned in comment #5 was added to the mainline kernel as of 3.13-rc1, so it should already be in Trusty.

git describe --contains dcdfdf5
v3.13-rc1~7^2~16

Can you again test the latest mainline, which is now 3.19-rc4:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-rc4-vivid/

Also, is this a regression? Was there a prior kernel version that did not have this bug?