Re: "EDID checksum is invalid"

Robert Morell rmorell@nvidia.com writes:

FWIW, I've seen that exact symptom on some monitors when the +5V pin on the DVI or HDMI cable from the GPU isn't enabled (or isn't providing enough current). Some monitors power the i2c/edid/DDC logic from that +5V either exclusively or when in the DPMS off state, and the i2c chip will just stop responding after a few cycles if not provided sufficient power.

Makes sense -- the chip will power itself from the i2c when not transmitting, and can talk until whatever energy is stored in various capacitors on the Vcc rail discharge.