5 ms·

If I understand your issue correctly, this is a macOS issue, where macOS only support DP daisy-chain (MST "Multi-Stream Transport") for mirroring content, not m

If I understand your issue correctly, this is a macOS issue, where macOS only support DP daisy-chain (MST "Multi-Stream Transport") for mirroring content, not multiple screens. https://medium.com/@sebvance/everything-you-need-to-know-about-macbook-pros-and-their-lack-of-displayport-mst-multi-stream-98ce33d64af4 https://medium.com/@sebvance/everything-you-need-to-know-abo... (I stumbled upon this limitation myself recently. Supposedly Windows doesn't have this limitation though I haven't tried it myself)

bombcar 6y ago
I don't know what I'm technically using, but it's two monitors daisy-chained via Thunderbolt and they're not mirrored. System Report says "Thunderbolt 2" is how they're connected.
- paco3346 6y ago
  Part of it may also depend on the dock and how it routes the TB lanes. My dock uses 2 lanes for dock features and does passthrough for the rest. Are you able to daisy-chain your monitors off any of those ports without the dock in the path?
  - bombcar 6y ago
    I have no dock at all (though technically the monitors may be a dock). Apple Thunderbolt 3 to Thunderbolt 2 cable -> 34UM88 -> Thunderbolt 2 to Thunderbolt 2 cable -> 34UM88. To make it even more fun, Thunderbolt 3 looks like USB-C and Thunderbolt 2 looks like Mini DisplayPort. https://i.imgur.com/5TJaIqg.png https://i.imgur.com/5TJaIqg.png (Technically I do have a dock but it's on the other side and is unrelated).
    - danieldk 6y ago
      To make it even more fun, Thunderbolt 3 looks like USB-C and Thunderbolt 2 looks like Mini DisplayPort. What do you mean? Thunderbolt 3 uses USB-C connectors. And you can also use a Thunderbolt 3 cable as a USB 3.1 Gen2/DP-Alt/PD cable. The big annoyance is that it doesn't work the other way around. There are even USB-C cables that only carry USB 2.0 and do not have the SuperSpeed lanes. So, they are not only worthless for Thunderbolt 3, but also for getting good tranfer rates using newer USB revisions. Worst of all is that there is no cable marking system.
      - bombcar 6y ago
        Exactly - I have no easy way to tell if something is "USB USB-C" or "TB3 or TB4 USB-C" especially on the adapters. It's frustrating getting everything hooked up.
      - citrusybread 6y ago
        it's hilarious you know. for almost 20 years we had this perfect "it sits it fits" approach to usb, now here we are, four standards three cables one connector. easily avoided by just keeping a different connector for each spec...
        bombcar 6y ago
        We even had USB 3.0 type B (a connector that take two different kinds of USB type B) - but we've moved on from that. It's understandable that if you have a interface that is compatible with another (Thunderbolt 3 can run USB 3.2) that the connector is the same, but it's frustrating. At least usually you'll get something that kinda works.
      - kevin_thibedeau 6y ago
        The USB-C connector isn't for USB3. It's for any version of USB. It's perfectly valid to have a 1.1 12Mbit HID using the USB-C connector.
        danieldk 6y ago
        I didn’t say that. I even mentioned cables that only carry USB < 3.

bombcar 6y ago

I don't know what I'm technically using, but it's two monitors daisy-chained via Thunderbolt and they're not mirrored. System Report says "Thunderbolt 2" is how they're connected.

paco3346 6y ago
Part of it may also depend on the dock and how it routes the TB lanes. My dock uses 2 lanes for dock features and does passthrough for the rest. Are you able to daisy-chain your monitors off any of those ports without the dock in the path?
- bombcar 6y ago
  I have no dock at all (though technically the monitors may be a dock). Apple Thunderbolt 3 to Thunderbolt 2 cable -> 34UM88 -> Thunderbolt 2 to Thunderbolt 2 cable -> 34UM88. To make it even more fun, Thunderbolt 3 looks like USB-C and Thunderbolt 2 looks like Mini DisplayPort. https://i.imgur.com/5TJaIqg.png https://i.imgur.com/5TJaIqg.png (Technically I do have a dock but it's on the other side and is unrelated).
  - danieldk 6y ago
    To make it even more fun, Thunderbolt 3 looks like USB-C and Thunderbolt 2 looks like Mini DisplayPort. What do you mean? Thunderbolt 3 uses USB-C connectors. And you can also use a Thunderbolt 3 cable as a USB 3.1 Gen2/DP-Alt/PD cable. The big annoyance is that it doesn't work the other way around. There are even USB-C cables that only carry USB 2.0 and do not have the SuperSpeed lanes. So, they are not only worthless for Thunderbolt 3, but also for getting good tranfer rates using newer USB revisions. Worst of all is that there is no cable marking system.
    - bombcar 6y ago
      Exactly - I have no easy way to tell if something is "USB USB-C" or "TB3 or TB4 USB-C" especially on the adapters. It's frustrating getting everything hooked up.
    - citrusybread 6y ago
      it's hilarious you know. for almost 20 years we had this perfect "it sits it fits" approach to usb, now here we are, four standards three cables one connector. easily avoided by just keeping a different connector for each spec...
      - bombcar 6y ago
        We even had USB 3.0 type B (a connector that take two different kinds of USB type B) - but we've moved on from that. It's understandable that if you have a interface that is compatible with another (Thunderbolt 3 can run USB 3.2) that the connector is the same, but it's frustrating. At least usually you'll get something that kinda works.
    - kevin_thibedeau 6y ago
      The USB-C connector isn't for USB3. It's for any version of USB. It's perfectly valid to have a 1.1 12Mbit HID using the USB-C connector.
      - danieldk 6y ago
        I didn’t say that. I even mentioned cables that only carry USB < 3.