https://bugzilla.kernel.org/show_bug.cgi?id=210517
--- Comment #5 from Erhard F. (erhard_f@mailbox.org) --- (In reply to Dave Airlie from comment #4)
The fix for this is in Linus' tree already
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ drivers/gpu/drm/nouveau?id=aea656b0d05ec5b8ed5beb2f94c4dd42ea834e9d
This patch solves the problem, thanks!