Comment 8 for bug 1351282

Rob van den Berg, as the mainline kernel is not supported in Ubuntu as per https://wiki.ubuntu.com/Kernel/MainlineBuilds#Does_the_kernel_team_support_the_mainline_kernel_builds.3F , the next step is up to you. If you would like to see a fix backported to a Ubuntu kernel, one would need to reverse bisect the kernel in order to identify the fix commit following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F .