HDMI 2.1 to USB-C DisplayPort 1.4 Alt Mode

Updated on 12-08-2022 in Adapters and Cables
8 on 09-03-2021

Currently, we have DisplayPort 1.4 to HDMI 2.1 adapters (CAC-1085 and Cable Matters 201388 which probably use the RTD2173 chip) and HDMI 2.0 to DisplayPort 1.2 adapters (CAC-1331 and CAC-1332 which probably use the LT6711 chip).

Now we need HDMI 2.1 to DisplayPort 1.4 adapters. The LT6711GX chip can do that. It is backward compatible with DVI1.0, HDMI 1.4, HDMI 2.0b, DisplayPort 1.1, DisplayPort 1.2, DisplayPort 1.3.
http://www.lontiumsemi.com/product/list_1849.html

The adapter will be useful even for people that only have an HDMI 2.0 port or a DisplayPort 1.2 display because of the following:

  1. The DisplayPort 1.2 adapters don’t support 10 bpc or greater even though HDMI 2.0 and DisplayPort 1.2 can.
  2. The DisplayPort 1.2 adapters don’t support width greater than 4096 (such as 5K) even though HDMI 2.0 and DisplayPort 1.2 can (I’ve run into this problem)

 

For people with DisplayPort 1.4 displays (gaming or otherwise):

  1. DisplayPort 1.2 doesn’t support 4:2:0
  2. DisplayPort 1.2 doesn’t support HDR
  3. DisplayPort 1.2 has less bandwidth than DisplayPort 1.4. Even though HDMI 2.0 has less bandwidth than DisplayPort 1.2, it can use 4:2:0 to support higher pixel clock than DisplayPort 1.2.

 

For people with HDMI 2.1 gaming consoles or other sources:

  1. 4K 120Hz or 8K 30Hz (without DSC or chroma sub sampling)
  2. 8K 60Hz with DSC or 4:2:0
 
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1 on 30-05-2021

Great, when can I buy one for PS5

on 03-01-2022

Yeah i have the same peoblem. Got cac 1085 and it doesnt work : /. Did you find any cable that actually works ?

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0 on 09-07-2021

Currently, we have DisplayPort 1.4 to HDMI 2.1 adapters (CAC-1085 and Cable Matters 201388 which probably use the RTD2173 chip)
From joevt

Synaptics has some chips that can output HDMI 2.1: VMM8210, VMM8100, VMM6210, VMM6100

 

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0 on 14-07-2021

Cable Matters says the 201388 uses the VMM6100.

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0 on 03-02-2022

any update here?

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0 on 24-03-2022

> Now we need HDMI 2.1 to DisplayPort 1.4 adapters. 

Any update here? Has anyone found a solution to this problem?

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0 on 04-04-2022

We need this please. HDMI 2.1 to USB-C Alt mode

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0 on 12-08-2022

Club 3D Just released the CAC-1335 and CAC-1336.
https://insights.club-3d.com/thread/hdmi-2-1-to-display-port-1-4/

 

The product pages say they can do 4K120 and 8K30.
https://www.club-3d.com/en/detail/2610/hdmi_micro_usb_to_usb_type_c_4k120hz_or_8k30hz_m-f_active_adapter/

https://www.club-3d.com/en/detail/2609/hdmi_micro_usb_to_displayportt_4k120hz_or_8k30hz_m-f_active_adapter/

Hopefully they can do 5K60 and 6K60 for Apple’s displays from HDMI 2.1 sources or lower refresh rates for 5K and 6K from HDMI 2.0 sources such as 5K39 for the LG UltraFine 5K display.

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