Hello,
I've just booted 3.0.0-rc3 on my machine, and I got that message : Jun 16 15:32:07 tux kernel: [drm] GMBUS timed out, falling back to bit banging on pin 5 [i915 gmbus dpb]
I've checked my logs, and I never got that with my previous 2.6.39.1 kernel, so that looks like something new to 3.x.
Should I report more details (and if so, which ones) or is that harmless (though I doubt kernel messages about a time out are harmless ;)
Paul
PS : Added intel-gfx and dri-devel from previous emails related to i915, but I'm not subscribed to these lists.