Mini DisplayPort daisy-chaining

multiple-monitors displayport mini-displayport daisychaining

9,186

Solution 1

Mini DP is just a different form factor, the wires are the same. So at the protocol level, there are no reasons whatsoever why this shouldn't work.

At the bare hardware level, the adapter means another contact point, so more opportunities for broken cables and/or bad contacts. Cabling is generally considered critical for DP.

You didn't ask for this but given you're in the planning phase, you probably want to know this:
DP daisy chaining critically depends on each monitor correctly handling Multi-Stream mode. Given that monitors that can do this are just starting to become mass-market ware, this does not always work; for example, early revisions of Dell U2515H are known to be flaky.
The graphics card needs to be powerful enough to shove that many pixels out per second. Moderately powerful GPUs can handle that with ease, but the protocol chips between GPU and connector need to be designed for that load, too.

So: No guarantees at this time, though the situation is going to improve over the next few years as vendors react to complaints. If you order, order from a seller with a full-refunds-no-questions-asked policy.

Solution 2

I have a Macbook Pro 2015 model and 2 K272HUL monitors that are chained. Macbook mini DP to Monitor 1 DP in -> Monitor 1 DP out to Monitor 2 DP in. Doesn't work. When I called Acer support, they said that it works fine on Windows but they haven't tested on Mac. When I called Apple Support (case #1107920040), they tried to reset and it didn't work. Since it's an inconvenience and nice to have, they said to use 1 thunderbolt per monitor and not chain them. I also noticed what was weird is that system information shows 2 monitors BUT they have the same serial number. I'm thinking that there is there is a bug in the software and it's just not fixed yet.

9,186

Matej Voboril

Updated on September 18, 2022

Comments

Matej Voboril almost 2 years
I haven't found any documentation saying it's not possible, but I've been trying to find if daisy-chaining Mini DisplayPort-to-DisplayPort with successive monitors connected using DisplayPort.

So:
```
Source-out -> Mini DisplayPort -> mDP to DP adapter ->
Monitor 1 in -> DisplayPort
Then Monitors 2+ -> DisplayPort, so normal daisy-chaining at that point.
```
Does anyone know if this is possible and/or why it wouldn't be? This is assuming the full standards across the board, with DP 1.2a compliance on the DP's and mDP compliant to the 1.2a standard.

I'm thinking of, for source, something like a tablet or docking station that has just the one display out, necessitating either USB-to-display connection or not using more displays.
- Ƭᴇcʜιᴇ007 almost 10 years
  
  When you tried your suggested solution, what were the results? Where are you getting stuck exactly?
- Matej Voboril almost 10 years
  
  It was a question, not a problem. I'm asking as a concept. I haven't had opportunity to try it. Also, anyone feel like saying why the down without a comment? Or was that you, Techie007?
- Ƭᴇcʜιᴇ007 almost 10 years
  
  It wasn't me, but I'd guess it was due to a perceived lack of research effort. SU's not big fans of theoretical "will this work" type of questions. We like real problems that have had real attempts at fixing before they show up here. Anyway, why do you think it wouldn't work, especially if they're all to the same DP spec (as you've suggested)?
- Matej Voboril almost 10 years
  
  I think it would work because of that. I'm asking for any research or experience where it hasn't worked.
MKN Web Solutions almost 8 years

have you gotten any updates on this?
Albert T. Wong almost 8 years

Mac doesn't support it.
MKN Web Solutions almost 8 years

Yeah I figured after seeing it work via Windows instance.
Toto over 2 years

How is this answering the question?