You need to disable the nouveau driver:
(...)
[ 13.494581] [drm] nouveau 0000:02:00.0: Allocating FIFO number 2
[ 13.498059] [drm] nouveau 0000:02:00.0: nouveau_channel_alloc: initialised FIFO 2
(...)
[80081.353605] [drm] nouveau 0000:02:00.0: nouveau_channel_free: freeing fifo 2
(...)