Cable is Unplugged, Lost Training - 3.0 English

DisplayPort 1.4 RX Subsystem Product Guide (PG300)

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3.0 English

When a cable becomes unplugged or training is lost for any other reason, the TRAINING_LOST interrupt occurs. At that point, video data and MSA values should not be relied on.

After the cable becomes plugged in again, no action is required from you; the core properly resets itself and applies HPD. In a scenario, where the cable is plugged-in but the training is lost, the software is expected to assert a HPD upon the occurrence of a TRAINING_LOST interrupt, so that the Source can retrain the link.