It seems to be https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7546abfb8e1f9933b549f05898377e9444ee4cb2 + the fact streams are assigned in reverse order. I'll have a patch for reversing the assignment shortly. Alex, is the limit 4 streams on 7-output cards as well, or is it just these 1-output cards only?