Comment # 52 on bug 59168 from Ilia Mirkin

This bug covered a lot of different issues over its lifetime. The last one of
them is a NVCF issue where the second copy engine does not appear to be there.
We've disabled nouveau attempting to use it on any NVCF's and the patch is in
3.18 (and being backported to stable trees).

If you feel like you still have an issue related to this bug, open a new one,
do not under any circumstances reopen this one, as it has been too polluted by
unrelated issues and comments.