If you are using bleeding-edge DragonFly (4.3) on a machine with Intel video, the i915 module has been renamed. This means you will probably need to rebuild xf86-video-intel from source to have it match. There should be a matching binary package soon.
If you are on DragonFly 4.2, this does not affect you.
Thank you, DragonFly Project! But I am newbe ;-) iDragonFly user and wait binary package. Sorry for my bad English…