3 ms·

I hope it can do DisplayPort Multi Stream Transport. Currently I have to connect one screen through TB4, and the other one through HDMI despite the TB4 screen b

I hope it can do DisplayPort Multi Stream Transport. Currently I have to connect one screen through TB4, and the other one through HDMI despite the TB4 screen being able to daisy chain through DisplayPort. One screen is a 32 inch UHD 60Hz monitor and the other one is a 24 inch 2560x1440 90Hz screen which is rotated by 90 degrees.

DiabloD3 3y ago
The hardware supports it fine, if you ran any other OS it'd work. OSX refuses to support it because it eats into their monitor sales that use an alternative TB-based multiplexing protocol (which is only available on Apple devices, which are, well, not the world's best monitors, yet somehow the most expensive per square inch in a lot of cases). All the various incarnations as far back as Ivy Bridge's TB2 should have working support in Windows and Linux. I have physically tested it on my MBPR from that era, and it worked, and I know of other people's newer OS-swapped Macs also working. Lack of MST support in OSX has historically blocked 4k early adopters: 4k screens exported themselves as two logical displays due to 4k monitors coming out ahead of HBR2-capable controllers. As for ARM-era Macs, as far as I know, they licensed a common ASIC block for their DisplayPort transceiver, which is also what AMD, Nvidia, and Intel have done. So, their hardware should still support it fine, but I have no clue if Asahi's work on the GPU driver has gotten MST to work.
- de6u99er 3y ago
  Of course the gardware supports it, otherwise I couldn't connect the second rotated screen through HDMI. But I couldn't figure out why OS-X fails to support DP-MST. If it's because they want to push their own screens then shame on Apple. It's ridiculous that they refuse to support this. Iit's actually backfiring. Peoppe at work laugh when they see me attaching two cables to my Macbook ehile everyone else with different operating systems use their docking stations or daisy chaining. Even old Chromebooks support it.
  - lathiat 3y ago
    It worked on Intel macs because it worked in Windows. May be a different story on Apple Silicon though. Maybe a challenge for the Asahi Linux devs. I have no idea where in the stack MST happens and whether it requires any hardware magic.
bombcar 3y ago
I need to check how I have my four displays attached to my MacBook, because I know one is the HDMI, one is HDMI via the dock, but I swear two are connected via some form of daisy chain.
bombcar 3y ago
It is a device connected at "up to 20 Gb/s x1" that converts to display port and then the displays are chained. My records indicate it is this: https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-u... I drive two 34UM88 with it.

DiabloD3 3y ago

The hardware supports it fine, if you ran any other OS it'd work. OSX refuses to support it because it eats into their monitor sales that use an alternative TB-based multiplexing protocol (which is only available on Apple devices, which are, well, not the world's best monitors, yet somehow the most expensive per square inch in a lot of cases). All the various incarnations as far back as Ivy Bridge's TB2 should have working support in Windows and Linux. I have physically tested it on my MBPR from that era, and it worked, and I know of other people's newer OS-swapped Macs also working. Lack of MST support in OSX has historically blocked 4k early adopters: 4k screens exported themselves as two logical displays due to 4k monitors coming out ahead of HBR2-capable controllers. As for ARM-era Macs, as far as I know, they licensed a common ASIC block for their DisplayPort transceiver, which is also what AMD, Nvidia, and Intel have done. So, their hardware should still support it fine, but I have no clue if Asahi's work on the GPU driver has gotten MST to work.

de6u99er 3y ago
Of course the gardware supports it, otherwise I couldn't connect the second rotated screen through HDMI. But I couldn't figure out why OS-X fails to support DP-MST. If it's because they want to push their own screens then shame on Apple. It's ridiculous that they refuse to support this. Iit's actually backfiring. Peoppe at work laugh when they see me attaching two cables to my Macbook ehile everyone else with different operating systems use their docking stations or daisy chaining. Even old Chromebooks support it.
- lathiat 3y ago
  It worked on Intel macs because it worked in Windows. May be a different story on Apple Silicon though. Maybe a challenge for the Asahi Linux devs. I have no idea where in the stack MST happens and whether it requires any hardware magic.

bombcar 3y ago

I need to check how I have my four displays attached to my MacBook, because I know one is the HDMI, one is HDMI via the dock, but I swear two are connected via some form of daisy chain.

bombcar 3y ago

It is a device connected at "up to 20 Gb/s x1" that converts to display port and then the displays are chained. My records indicate it is this: https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-u... I drive two 34UM88 with it.