Does a USB-C monitor support DisplayPort input over a USB-C to DisplayPort cable?
The best you can get now is what you have: USB-C with DisplayPort Alt Mode + USB 2.0.
Or use a Blackmagic eGPU (but the GPU is not upgradable).
There is no good solution for connecting Thunderbolt display to eGPU (other than Blackmagic eGPU) and get PCIe tunnelling functionality (required for USB 3.x from LG 24 inch UltraFine 4K). The missing piece is software/driver. People have been working on custom firmwares and SSDT patches to get Thunderbolt 3 add-in cards such as the GC-TITAN RIDGE to work in a Mac Pro. I haven't tried them. A Thunderbolt 3 add-in card in a Thunderbolt 3 expansion box connected to a Thunderbolt 2 MacBook Pro may require additional code.
In the future, the code for enabling PCI tunnelling on Thunderbolt 3 add-in cards may be usable. Or USB4 devices may be created to support DisplayPort input and Thunderbolt output (take the place of the Blackmagic eGPU).
I don't think there is any way to convert DisplayPort to USB-C other than a full video conversion box which will introduce other problems. As mentioned above, the BlackMagic Pro supports USB-C but has been discontinued. I had the same problem and the only solution I could find was the Radeon Pro W5700. This has a USB-C output port, but is pricey. My build is here: Node Titan with Radeon Pro
I don't think there is any way to convert DisplayPort to USB-C other than a full video conversion box which will introduce other problems.
There are many ways to get USB-C with DisplayPort Alt Mode:
Cable and adapter options (limited to USB 2.0; probably limited to DisplayPort 1.2 (HBR2))
1) Bidirectional USB-C to DisplayPort cable such as the one sold by Moshi or ALOGIC or whoever (doesn't include USB which some displays require such as portable displays that require USB power or the old 21" LG UltraFine 4K display - not true : three people have reported that the ALOGIC cable works with the 22 inch LG UltraFine 4K display and one person reported the Club 3D cable did not).
16) Delock 63928 (one person says it doesn't work with the latest LG UltraFine 4K display (23.7 inch HMUA2ZM/A) and another person says it doesn't work with the latest LG UltraFine 5K display (27MD5KL); maybe this means it doesn't work with Titan Ridge displays?).
2) Belkin Charge and Sync Cable for Huawei VR Glass (known to work with Navi + Apple Pro Display XDR for 6K 60Hz and brightness/presets).
3) Huawei VR 2 Computer Connection Cable (Belkin has more/better power with additional USB input).
4) Wacom Link Plus (has separate power like Belkin).
15) BizLink VirtualLink Interface Adapter (no compromises - USB 3.x and DP 1.4 two and four lane - but doesn't actually exist?)
PCIe options (USB 3.1 gen 2 requires PCIe connection to computer via PCIe slot, M.2, mPCIe, Express Card, Thunderbolt; DisplayPort conversion does not require PCIe connection):
5) Sunix UPD2018 (supports USB 2.0 and 3.x).
6) Delock 89582 / Dell 1H0Y3 / Dell M0W58 / Dell WYY76 (same as Sunix).
7) GC-ALPINE RIDGE (USB 2.0; USB 3.x; DisplayPort 1.2 over Thunderbolt (HBR2); requires software (EFI and/or driver) and extra wiring to enable USB; PCIe tunnelling for Thunderbolt requires more work/software).
8) GC-TITAN RIDGE (USB 2.0 via external connection; USB 3.x; DisplayPort 1.4 over Thunderbolt (HBR3); requires simple wiring to enable USB; PCIe tunnelling for Thunderbolt requires more work/software).
GPUs and eGPUs (all support full USB-C with DisplayPort 1.4 Alt Mode - must have PCIe connection to computer; DisplayPort can come only from the GPU):
9) Blackmagic eGPU (full TitanRidge Thunderbolt support).
10) Nvidia RTX (not macOS compatible).
11) AMD W5700.
Thunderbolt 3 devices (DisplayPort comes only from the host computer which must have Thunderbolt):
12) Any Thunderbolt 3 device with two Thunderbolt 3 ports can output USB-C with DisplayPort Alt Mode from the second Thunderbolt 3 port.
13) The HP Thunderbolt Dock G2 has a Thunderbolt 3 port and a USB-C port which both support USB-C DisplayPort Alt Mode.
14) USB4???? Maybe there'll be USB4 replacements for the Blackmagic eGPU and Thunderbolt 3 add-in cards which will support DisplayPort 1.4 input and Thunderbolt/USB-C output.
Thanks for your insights and your proposed solution but I still struggle to connect both displays.
My set up is as follows:
- MacBook Pro 13” 2016 4 x thunderbolt 3 ports – Mac os Catalina
- Belkin Thunderbolt 3 Pro
- 2 x 22” LG Ultrafine 22md4k
- Club 3D USB C to Display port Cable 1.4 8K 60Hz, 4K 120Hz and Displayport to USB C bi-Directional
My issues is that monitor connected via display port (from Belkin) to USB-C (on monitor) does not turn on although I can see it’s name appear in settings on my MacBook pro rig + HP Elitebook. Based on previous posts I have read, the 22md4k version needs additional power in order to work.
Do you believe that buying Hauwei VR2 cable to connect my Belkin Thunderbolt 3 Pro to monitor will work? Wanted to double check before splurging 70 USD on a cable.
I slowly start to lose hope using both screens at the same time on my Mac + HP Elite Book.
Really appreciate your support.
P.S: I can plug 2 separate cables on my mac but issues is on my HP elitebook (work computer and I really need 2 screens) which only has 1 x USB-C port and 1 x HDMI. For this reason I bought Belking Thunderbolt 3 Pro to connect via display port which does work so far
@rafalo86, Use any option except #1 for the old 22 inch LG UltraFine 4K display.
@rafalo86, What HP Elitebook do you have?
What do you mean by "For this reason I bought Belkin Thunderbolt 3 Pro to connect via display port which does work so far"? Is the Belkin Thunderbolt 3 Pro connected to the HP Elitebook? How? What is connected via DisplayPort? Which DisplayPort port is what connected to?
Thanks for your feedback @joevt.
Belkin Thunderbolt 3 Dock is connected to Thunderbolt 3 in my MacBook Pro 13" 2016 or HP Elitebook 840 G5. On neither of those laptops it worked with
Club 3d cable is connected to output display port Thunderbolt 3 and input of USB-C LG Ultrafine".
Is your suggestion still to go for Hauwei/Belki cable with USB?
Appreciate your support
@rafalo86, Yes, those cables have the best chance of working. One person said that a bidirectional ALOGIC USB-C to DisplayPort cable can work with the 22" LG UltraFine 4K display.
What GPU does your HP Elitebook 840 G5 have? Is it Intel or AMD? I don't know how many displays the Thunderbolt port of the Elitebook supports. It might support only one display. If that's true, then you'll want to connect the second display to a port on the laptop.
Do you have any idea why alogic cable would work but not Club 3D USB C to Display port Cable?
My HP Elitebook has Intel i5-8350U 1.70 ghz processor (work computer) and only has 1 x HDMI output. Do you know where I can check if thunderbolt can support 2 monitors?'
Now I am a bit puzzled whether I should buy the alogic cable or the hauwei. For the Huawei, will it work if my output on thunderbolt 3 dock is USB 3?
Thanks again for your help and wait for latest insights before making the purchase and testing