[joevt]

DisplayPort to HDMI adapters (such as the CAC-1056, CAC-1070, CAC-2070, CAC-1080, CAC-1085) only work in one direction (DisplayPort output of computer to HDMI input of display). To connect HDMI output of computer to DisplayPort input of display, you need a HDMI to DisplayPort adapter (such as the CAC-1330, CAC-2330, CAC-1331,  CAC-1332)

Only DisplayPort output can do MST. HDMI to DisplayPort adapters cannot do MST to multiple displays.

The specs for the HP Pavilion Gaming Notebook with a Nvidia GTX 1660 Ti at
https://store.hp.com/CanadaStore/Merch/Product.aspx?id=10M27UA&opt=ABL&sel=NTB  says it has the following:

1 SuperSpeed USB Type-C® 10Gbps signaling rate (USB Power Delivery, DisplayPort™ 1.4, HP Sleep and Charge)

So what you need is a USB-C to DisplayPort adapter (such as the CAC-1507, CAC-1567). For your laptop which supports DisplayPort 1.4, I would choose the CAC-1567. Then you can connect your MST Hub to that. For higher refresh rates and resolutions, replace the DisplayPort 1.2 MST Hub with a DisplayPort 1.4 MST Hub (such as the CSV-7300 or CSV-1550).

I’m not sure if displays connected to the USB-C or HDMI ports of the laptop are connected to Nvidia or Intel graphics – check the Device Manager.

I don’t think there’s anywhere in Windows that shows the MST Hub. But the graphics drivers will be able to show multiple displays when connected to the MST Hub. If a MST hub is connected to Intel Graphics, then the Intel Graphics Control Panel can show the topology.

Linux has the fwupdtool command that can list MST hubs that use a Synaptics chip. The Linux dev directory can list the DisplayPort Aux channels of each DisplayPort port (for MST hubs, you need a display connected for the device to appear).

[joevt]

If you had an Intel Mac, then you could test various custom resolutions to see if any work.

Does the M1 Mac at least detect the display? If so, then you can use the script at https://gist.github.com/joevt/e862b0088ef58b9144877d01401bcee8 to tell you what timing it’s trying to use.

The DisplayPort to HDMI 2.0b chip that the M1 Mac uses probably doesn’t support 5K width even at 30 Hz. It doesn’t matter anyway without a method to create custom timings.

I have a display that can accept 5K 30Hz over HDMI 2.0 and DisplayPort 1.2 from a RX 580 connected to an Intel Mac mini 2018, but I cannot get RX 580 -> CAC-1331 -> display to work with 5K 30Hz. I assume the CAC-1331 and CAC-1332 use the same HDMI 2.0 to DisplayPort chip.

3840×2160 60Hz, 4096×2160 60Hz, 4096×2304 58Hz all seem to work though.

Is there a firmware update to allow greater width than 4096 with the CAC-1331 or CAC-1332?

[joevt]

NVIDIA GPUs only support a maximum of 4 displays. 

AMD GPUs only support a maximum of 6 displays.

In either case, adding an MST hub does not increase the maximum number of supported displays.

[joevt]

Did you get the CAC-1510 (HDCP ON) or the CAC-1510-A (HDCP OFF) or something else? The Apple 30 Inch Cinema Display may work better with the CAC-1510-A (HDCP OFF) version.

[joevt]

My newest DisplayPort 1.4 MST Hub is the CalDigit SOHO. It supports DSC.

For my oldest DisplayPort 1.4 MST Hub (the HP Thunderbolt Dock G2), I was able to enable DSC using the firmware update from HP. I think the updater requires non-DCH Thunderbolt drivers (not the new DCH Thunderbolt drivers).

My Delock 87737 didn’t come with DSC support either and there’s no firmware updater. I asked Delock for a firmware update but they only gave me a firmware file and not the updater. I tried using the Linux fwupdtool command which was able to apply the firmware but now the Delock doesn’t seem to function properly, so maybe the firmware was not applied correctly or the firmware does not apply to the version of the adapter that I have.

The following command in Linux (such as Ubuntu) is able to list the chip id, board id, and firmware version for each MST Hub.
[code]
sudo fwupdtool get-devices
[/code] 

Before the firmware updates:
HP Thunderbolt Dock G2: version 5.03.01
Delock 87737: version 5.03.08
CalDigit SOHO: GUID:MST-panamera-vmm5210-2 version:5.05.202

After firmware updates:
HP Thunderbolt Dock G2: GUID:MST-panamera-vmm5333-849 version:5.04.05
Delock 87737: GUID:MST-panamera-vmm5330-2 version:5.04.132 (but doesn’t work?)

So if you have any Synaptics DisplayPort 1.4 MST hub (including the Club 3D one), then I guess you should use [code]
sudo fwupdtool get-devices
[/code] to make sure you have the 5.04.xx firmware.

 

[joevt]

When you say “connect the receiver direct (with HDMI) to the graphics card”, do you mean AMD RX-560 HDMI => Onkyo TX-RZ730 ?

Does AMD RX-560 DispayPort => CAC-1080 => Onkyo TX-RZ730 work? If not, then the problem is with the CAC-1080, not the CSV-7300.

But the CAC-1080 product page does say:

– LPCM and compressed Audio encoding formats

– Max audio sample rate of 192 Khz x 8 Channel or 768 KHz x 2 Channel

[joevt]

The first HDMI 2.0 to DisplayPort adapters had dip switches to choose different EDIDs. There was a firmware update created to support 533.25 MHz timing in one of the EDIDs but I didn’t have a display that had a problem with 594 MHz to test. Read about those adapters at
https://insights.club-3d.com/thread/hdmi-2-0-to-displayport-1-2-2/

 

[joevt]

Oh, I think you are trying to get 594 MHz (HDMI 2.0 timing) to a display that only supports 533.25 MHz (CVT-RB timing). Have you tried HDMI 2.0 timing over DisplayPort to the display from PC to see if the display supports 594 MHz?

HDMI 2.0 timing is like this:
3840×[email protected] 135.000kHz 594.00MHz h(176 88 296 +) v(8 10 72 +)
(front porch, sync width, back porch, polarity)

CVT.RB timing is like this:
3840×[email protected] 133.313kHz 533.25MHz h(48 32 80 +) v(3 5 54 -)

I don’t know if there’s a way to fix this if there’s no way to make a custom timing in Xbox. A modern 4K display supporting more than 4K60 may be the best solution.

[joevt]

A02 means you can’t enable HDMI 2.0:
https://www.dell.com/support/kbdoc/en-is/000126493/setting-up-the-p2415q-p2715q-monitors-with-hdmi-2-0-that-support-4k-x-2k-60hz

There’s no way to select 30Hz on the Xbox? Did you try 1080p or 1440p?

[joevt]

The cable is probably fine.

Maybe the TV doesn’t support 8bpc 4:4:4? So you have to do 10bpc 4:2:2 or 4:2:0. Maybe it can do the other modes but you need to change a setting on the TV or override the EDID with an app like CRU?

[joevt]

If the xbox can do 4K 60Hz, then use the CAC-1331 to convert from HDMI 2.0 to DisplayPort 1.2.

Otherwise you can connect a HDMI cable for 4K 30Hz. or 1440p60.

[joevt]

Yes, the MST Hub does DSC decompression. The CSV-7300 product page shows how DSC allows connecting more displays than without DSC but they don’t give bandwidth numbers (they don’t describe the pixel format for the DSC case, and they don’t mention the level of chroma subsampling for either case).

I haven’t tested my MST hubs (not Club 3D) that support DSC with multiple displays yet. I have a Radeon W5700.

[joevt]

CSV-1460 uses DisplayLink. It has no video input. Video is compressed and transmitted by USB to the DisplayLink adapter built-in to the CSV-1460 which decompresses it to DisplayPort or HDMI. A driver is required to do the compression and transmission.

The specs for the CSV-1562 are unclear. It has a USB-C input and says DisplayPort Alt Mode is required for video. But then the downloads page and install guide mentions DisplayLink drivers so maybe one port is connected to the computer’s GPU via DisplayPort Alt Mode, and the other two ports are connected via DisplayLink? The specifications don’t mention which DisplayLink chip is used.

Club 3D doesn’t list their products on the displaylink.com website.

 

[joevt]

I think the product page is saying that a passive adapter/cable is required to use the dual mode feature, but an active adapter can be used to bypass the dual mode.

Usually dual mode (DP++) is limited to HDMI 4K 30Hz (especially for a DisplayPort 1.2 port). Sometimes it can do 4K 60Hz (sometimes for a DisplayPort 1.4 port) – it depends on the DP++ port. Even if it does support 4K 60Hz, you may want to use an active adapter if the DP++ port uses a DisplayPort to HDMI adapter that doesn’t have the features you want.

The CAC-1085 may be usable, but the input is limited to DisplayPort 1.2 with no DSC and no support for 4:2:0.

[joevt]

4K 60Hz over HDMI requires 8bpc RGB or 444. HDMI 2.0 pixel clock for 4K 60Hz is 594 MHz.

You can do 10bpc if 422 or 420 is used. I don’t think Intel 630 can do 420 but it can do 422 and the CAC-1080 says it can convert RGB or 422 to 420.

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