L1 USB C combiner

Level1 Store Product Inquiries
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I recently upgraded to a powercolor 7900 XTX Hellhound, but it doesn’t have USB C displayport alt mode. I can’t find any documentation online of which displayport has dp alt mode.

Would this work with my existing bidirectional USB C cable (it worked with my USB C switch and RTX 2070)

My monitor is a Dell U4320Q (4K 60 HZ). Here’s how I would connect it
Desktop displayport + USB - > l1 USB C combiner - > 10ft bidirectional USB C cable → USB C switch - > USB C input of Dell U4320Q

I have my keyboard, mouse, and audio interface connected to the monitor’s USB C inputs. I need to send video to the display and inputs to the desktop.

Is there any bidirectional dp - > USB C adapters?
@wendell @Level1_Amber

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It just depends on if the USBC cable you already have is both display & data capable. The USBC combiner does come with a USBC cable though, so you will have something if your existing cable is not compatible.

We usually use Moshi cables at the office because they’re the bomb for USB-C → DP, and I see on their website that the cables we usually use are bi-directional compatible:

“Connect your DisplayPort computer to a USB-C or Thunderbolt 3 (USB-C) monitor. (Bi-directional support*)*For bi-directional support, please check with the monitor manufacturer to ensure the monitor accepts a DisplayPort signal over USB-C (UFP_D pin assignment E).”

3 Likes
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Gotcha will test both

Makes sense. It’s pretty hard to find long 10ft cables (I guess due to length causing integrity issues, so I’m thinking of looking for a bidirectional dp - > usb c adapter so that I can use my existing long usb c cable.

Does the 7900xtx hellhound’s DP 2.1 support alt mode on all ports? How would I find the info? Searching 7900xtx hellhound displayport alt/mode doesn’t yield any relevant results.

Heck even the product page doesn’t say

Standard Display Connectors
1 x HDMI 2.1，3 x DisplayPort 2.1 (only 2x simultaneous DP2.1 connections can be supported)

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The Combiner is for PCs that do not support DP ALT mode. DP ALT mode is just a USBC port that can send out a DP signal. So the moshi cable I linked, for instance, is supposed to be plugged into a USBC port that supports DP ALT mode → into DP port on KVM

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Gotcha
Searching powercolor 7900xtx hellhound dp alt mode found the answer I was looking for.

been testin it, no thunderbolt/ usb4 port just standard Gen 2 / Display alt type C port fellas.

https://old.reddit.com/r/UsbCHardware/comments/zghuck/usb_c_on_video_cards_again_this_time_its_amd_7900/izhgkgu/

Guess I’ll pick up a combiner.

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There isn’t a USBC port on this GPU right? Then it’s not DP ALT by nature?

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Yeah that’s what I was trying to figure out

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Is there still any scratch and dent 2 PC USB C kvms?

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Hm lemme check. Do you want a 2 pc 1 monitor? Also, do you want the latest version (v3)? or a discount v2?

The difference is the v2s come with a 120w power brick and the v3s have a 135w power brick. So v3 has better PD charging capabilities.

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Yes

At full tilt, my laptop will use over the 120W. If it exceeds the KVM’s power, will the kvm pause charging to the battery?

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It will get either really slow charging, or be not enough and it will slowly loose power. Food for thought, you could always add a dock in the mix

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Gotcha do I need to pm for USB C v2 deals?

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Yes :slight_smile: and we’ll get ya settled