The xf86-video-intel 2.21.6 driver has been released, which among other changes, supports kernel mode-setting on OpenBSD.
OpenBSD finally received Intel KMS support
and due to slight differences in the interfaces, there were some small changes needed to the Intel X.Org driver to support the BSD operating system.
The xf86-video-intel 2.21.6 driver also has a workaround for the X Server failing to invalidate DRI buffers, computation of clip extents for stipplinf, clean-up sockets, fix AVX/AVX2 instruction set detection, a Gen4 video playback bug, and some other fixes.
The complete list of changes for xf86-video-intel 2.21.6 can be found from the mailing list release announcement