Open source driver by Oracle:
Relevant code is located in drm and i915 subfolders.
Martin Bochnig, creator of OpenSXCE, has backported the S12 driver to illumos, links to debug binaries in this email:
|ThinkCentre M91p||Intel HD Graphics 2000||Working, tested from 1024x768 to 1920x1080, occasional glitches within the last 16pixels of the screen, crashes under heavy load.|
|ThinkPad X230||Intel HD Graphics 4000||Only basic testing, 1366x768.|