2 ms·
Normal DP cables in particular are entirely passive, there is no chip or coding in them that would tell source/sink what kind of cable it is. IME the most likel
by formerly_proven 4y ago
Normal DP cables in particular are entirely passive, there is no chip or coding in them that would tell source/sink what kind of cable it is. IME the most likely result of a marginal cable will be that the screen sometimes goes black for 1-2 seconds or shows an artifact here or there. With DVI, which just directly blasted red/green/blue bits on separate wires at the pixel clock (bad for EMI) it was pretty easy to end up with a cable that had issues just on the twisted pair for a particular color.
- tverbeure 4y agoYes, I know they are entirely passive. That’s why the source and sink need to determine the maximum rate literally based on trial and error. The source tries a link speed (and other parameters such as drive strength and pre-emphasis), the sink reports back home many symbol errors it detected. Rinse repeat until a stable configuration is found. For marginal connections that’s often not sufficient. After the introduction of DSC, DP has mandatory support for Reed-Solomon forward error correction, which is a great help in fixing occasional error burst. It can be enabled when DSC is off, but I don’t know that happens in practice.
- formerly_proven 4y agoWasn't trying to correct you, just adding Just remembered where I saw your name before - I've been using your timings calculator for years!