On Tue, 21 Dec 2010 19:55:15 +0000, Chris Wilson wrote: > The test we do is simply whether the LVDS i2c pins are addressable. That > requires differentiating between an IO error and a NAK, which at present > is only possible using GMBUS. The reference to this method I found in the > BIOS writers' guide, but of course that doesn't actually explain how it > works (especially the significance of address 0xa0). I can't see how that would work without an i2c receiver on the DDC bus... But, then, I've been surprised by DDC in the past, so perhaps it's worth a test on a device that has LVDS but does not have EDID. -- keith.packard@intel.com