CSV-1550 – Display connection might be limited

Updated 3 days ago in USB Type C
7 6 days ago

Hello,

I just got this device and I keep getting ‘display connection might be limited’ on Windows 10, and no images on the monitor(s).  I also see a new device in the device manager ‘USB 2.0 BILLBOARD’ – which is surprising since the connector is USB-C.  Following the steps to update the drivers and help from Microsoft does not remediate.  

I am using this device to extend from my laptop ‘Asus ROG GL502VS-DB71’. 

Windows Info:

Edition Windows 10 Home
Version 21H1
Installed on ‎2020-‎06-‎06
OS build 19043.1110
Experience Windows Feature Experience Pack 120.2212.3530.0

I hope I’m not stuck with a dead device, since I can’t return a custom order to the store.  

Please advise.

 
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0 6 days ago

Hi tjdeep,

I can not find anywhere it says your USB-C Supports DisplayPort Alt mode.
https://m.media-amazon.com/images/I/C1IOYBLpRiS.pdf

Page 23.

https://www.digitweek.com/asus-rog-gl502vs-db71-laptop-review/

Paragraph: Connectivity one USB 3.1 Type C (gen 2)—doesn’t support Thunderbolt 3,

Assuming they also mean DisplayPort Alt mode.

Number 2 post.

https://techreport.com/forums/viewtopic.php?t=118950#p1333199

 

 

Proof me wrong but the device is not dead.

Depending on resolutions you want, the below might be an option? As you have a minidisplayport connection. 3 x 1080P @ 60Hz

https://www.club-3d.com/en/detail/2409/multi_stream_transport_(mst)_hub_displayportt_1.2_triple_monitor/

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1 5 days ago

Thanks Baak.  I understand it’s not a dead device, and I’ll look at the alternative products on the site.  

I’ll look more into DisplayPort Alt mode.  It appears that this term does not stand out in the product page, making it easy to glance over – would be nice to have a ‘requirements’ section with key items being called out.  

Other articles I read:
https://www.benq.com/en-us/knowledge-center/knowledge/usb-c-introduction-what-is-dp-alt-mode.html
https://blog.startech.com/post/tech-talk-using-usb-c-and-displayport-over-alt-mode/
https://www.tripplite.com/products/multi-stream-transport-mst-hub-technology

Is it correct to say that a Thunderbolt 3 port will support this device?

Regards.

5 days ago

Hi Tjdeep,

If you would have a Thunderbolt 3 or a USB-C that supports DisplayPort Alt-mode, yes the CSV-1550 would work correct.

But I must say the Apple’s with an M1 processor will not support MST. To make it more complicated 🙁 This is deliberately done by Apple.

Maybe you can also look into docking stations with DisplayLink.

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3 4 days ago

Apple supports mirroring on MST but not multiple displays. I don’t think they changed that with the M1 Macs. Apple also supports MST for old 4K displays that used two streams to get 4K60.

An MST hub can be used to convert narrow/fast DisplayPort to slow/wide DisplayPort or vice versa. For example, the Club 3D DisplayPort to Dual Link DVI adapters use HBRx4 but USB-C docks might only support HBR2x2 or HBR3x2 so you need an MST hub to convert HBR2x2 to HBRx4 to get 2560×1600 from the adapter in that case. This DisplayPort conversion feature of MST hubs also works on Macs.

4 days ago

Thanks joevt.  

Do you have recommendations or links to hubs that provide the functionality you mentioned?  

Regards.

4 days ago

Any MST hub should be able to do the same. DisplayPort 1.4 MST hubs like the CSV-1550 are the most capable because they support the highest DisplayPort bandwidth (HBR3 x4 with DSC). All the DisplayPort MST hubs I know including the CSV-1550 use the Synaptics chips (click all the “Read More” buttons at https://www.synaptics.com/products/video-interface-ics )

Also, if you have a GPU and OS and graphics driver that supports DSC, then it effectively increases the input/output bandwidth of the MST hub even more. For displays that don’t support DSC, the MST hub can take a DSC input and decompress it for output. This is how it is able to support three 4K 60Hz displays.

GPUs that support DSC are Navi (RDNA), RTX, Ice Lake, Tiger Lake, M1 Mac. macOS Big Sur and later might not support DSC. macOS Catalina supports DSC.

As for your problem with a PC laptop, PC laptop specs often skip details about maximum number of connected displays, or what GPU each port is connected to, or if a USB-C port supports DisplayPort Alt Mode or not.

Only PCs with Thunderbolt 4 are guaranteed to support DisplayPort Alt Mode (and also two displays via Thunderbolt) because Intel won’t let them use the Thunderbolt 4 name without those features. Other PC laptops without Thunderbolt 4 might only support one display from a Thunderbolt 3 port.

All Macs have Thunderbolt 3 ports that support two displays (except the M1 Mac where the second DisplayPort connection of the Thunderbolt port can only be used by dual tile displays like the LG UltraFine 5K or the Dell uP2715K display).

The billboard device is a feature of USB-C devices. If you connect a USB-C device that requires a specific USB-C Alt Mode (such as DisplayPort Alt Mode or Thunderbolt Alt Mode) but your USB-C port doesn’t support that feature then the OS can use the info of the billboard device to display a message.

The manual for the Asus ROG GL502VS-DB71 seems to indicate that the USB-C port only support USB 3.0. That’s 5 Gbps. DisplayPort 1.2 (HBR2) is 5.4 Gbps (per lane). DisplayPort 1.4 (HBR3) is 8.1 Gbps (per lane). The ROG GL502VS is from 2016. The Intel GPU can support 3 displays including the internal display. The Mini DisplayPort and HDMI port add up to 3, so it’s unlikely the USB-C port supports a display. But your laptop has an Nvidia GPU as well? But the specs don’t say what ports it’s connected to if any. Connect a display to all the ports and see what GPU the Device Manager says they are connected to. (view by Connection).

3 days ago

Thank you joevt. This is quite helpful.

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