Does a USB-C monitor support DisplayPort input over a USB-C to DisplayPort cable...
 
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Does a USB-C monitor support DisplayPort input over a USB-C to DisplayPort cable?  

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Jacob Gaudoin
(@jacob_gaudoin)
New Member
Joined: 2 months ago
 

Hi, found this thread which seems to have more information about this topic than anywhere else I could find. 

I’m trying to connect a PC to a 5k Ultrafine monitor that must be from 2017 or 2018 - it’s not mine so I’m not certain. PC has DisplayPort output either via motherboard or graphics card (GTX 1060).

The two options I thought I had were a PCIe thunderbolt AIC, but this is an ITX pc so I don’t have any slots left after graphics card. The other option I tried was the bidirectional DisplayPort to USB-C/Thunderbolt cable from Moshi mentioned in this thread, but that doesn’t appear to work either. I suspect it is something to do with power as mentioned in this thread...

Do I have any other options? Thanks!

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@jacob_gaudoin, If you have the original LG UltraFine 5K display (original:27MD5KA-B latest:27MD5KL-B) then it will not accept a USB-C only signal (which is limited to 4K). You must use a Thunderbolt 3 add-in card. The card be connected to the ITX via a NVMe adapter, or it can be not connected to the ITX and powered externally (using a PCIe riser, or a PCIe enclosure, or a another PC). Even if you do have a powered Thunderbolt 3 add-in card that works with normal USB-C displays and adapters, it might not work with the LG UltraFine 5K since the LG UltraFine 5K has no onscreen controls or even a power button.

 

 

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Jacob Gaudoin
(@jacob_gaudoin)
New Member
Joined: 2 months ago
 

@joevt, thanks! I bought a Titan Ridge 2.0 AIC and I can confirm it works great at 4K when using the DP output from the motherboard, into the AIC (installed in the PC) and then lightning USB-C to the Ultrafine, without installing any drivers, and even working in BIOS . I don't currently have a way to output 5K resolution to test, but 4K looks very good. I've noticed some ghosting on the screen but I think that is the screen itself - will check with the original owner. USB works as well when plugged in.

However I can't get Windows to recognise the Thunderbolt card or install Thunderbolt drivers, which is needed for there to be a chance of having camera/speakers/brightness control, although I've read these are a bit tricky anyway. My motherboard (Aorus Z390I) doesn't have a Thunderbolt header. I have tried jumping the 3 & 5 pins which I have seen discussed in other places, although I think that was focused on the 1.0 version. I have occasionally seen the Thunderbolt options appear in the BIOS and I managed to set GPIO3 to Enable, but still nothing in Windows. This card also has a 3 pin THB connector, which I think is only used if that's what your motherboard has.

I don't want to derail the thread with this completely different topic, but was wondering if you know more about this or where I can find more info? Thanks!

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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