Upgraded FreeBSD on my laptop to drm-next-4.6 (branch with GPU drivers ported from Linux 4.6). So, *ERROR* timeout waiting for SBI to complete read transaction dmesg spam (that slowed down booting for a couple seconds) is gone. New dmesg spam is hdac0: Unexpected unsolicited response from address 0: 00000000 at the end of the boot process, right before the login prompt, and not taking any time. clinfo doesn’t show self-test failed anymore. VAAPI video decoding acceleration still works. Haven’t tried connecting an external display yet.

The only real problem is that Firefox with full OpenGL compositing (layers.acceleration.force-enabled) is artifacting, but whatever, it’s fine without that.

Current status: reinstalling 1114 packages because o m g the ABI version changed to 12 :D