Comment # 9 on bug 1047765 from J�rgen Gro�

Sorry you see it that way.

The patch in question wasn't added to stable as it was regarded to be more a
kind of cleanup.

As I said: with confirmation the patch is really helping I would have sent
another request to add the patch to 4.12, and I'm sure it would have been
accepted.

There are very clear rules which patches may be applied to upstream stable
kernels. As long as there is no proof a patch really cures some failure it
won't be taken. As the developer of the patch agreed it would be improbable to
help in any situation it wasn't taken initially. That is no blocking forever,
though.

Unfortunately you didn't try what I asked you to: take the failing kernel and
add that single patch to verify it does help.