Comment 102 for bug 362582

Yeah, the second i2cdetect dump looks much more reasonable, and it looks like you've indeed found the right bus for your i2c device. So the next step is to use that one with dev_priv->gmbus[GMBUS_PORT_DPB] and see whether it works better.

Btw, the gmbus reserved and disabled don't really exist, 3.5 will kill them. And if you have quick questions I suggest you ask on irc, #intel-gfx on freenode, usually one of us is around.