Benjamin Herrenschmidt wrote:

quoted

It think it's because the (basic) EDID is retrieved with (basic) DDC
(address 0x50).  If I'm not mistaken, E-EDID is retrieved with E-DDC
(address 0xa0). I don't exactly know the protocol (E-DDDC specs are not
freely available), but try probing your i2c busses with:

i2cdump 0,1,2,etc 0xa0 

and see if you get anything.

Are you sure we aren't talking about the same address here ? Address
0xa0 _is_ 0x50 shifted one bit left ... (The low bit of an i2c address
is the RW bit). i2cdump takes shifted addresses, thus you can't pass it
anything above 0x7f, thus passing it 0x50 is what gives you address
0xa0 :)

Yeah, I just realized that :-)

Tony


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