My Sandy Bridge notebook needs a Macbook Pro 8,1 smbios.plist for the HD3000 to be recognized (earlier smbios plists don't work) and my webcam (which is fully detected by System Profiler) only works with Photobooth when I use CamTwist with the lower 320x240 resolution (Skype only works from time to time) or else I only get black screen. In contrast to the iSight used in earlier MacBooks the 8,1 uses a Factime HD camera. Could this problem somehow be related to that fact? Is it possible to tell OS X to generally use the low resolution?
if you use Lion on notebook and CamTwist work
can give a link for camTwist