https://bugs.freedesktop.org/show_bug.cgi?id=93800
--- Comment #6 from poma pomidorabelisima@gmail.com --- (In reply to Michel Dänzer from comment #2)
Can you try if http://cgit.freedesktop.org/xorg/xserver/commit/ ?id=25eca80265654cfbf8768024e027426fedeb0918 helps?
FTR I tested with this commit, and as for the nouveau it's business as usual, no change.
bye