[joevt]

CSV-1584 is USB-C DisplayPort Alt Mode instead of USB4 so it only supports HBR3 x2. That’s half the bandwidth of a normal DisplayPort 1.4 HBR3 x4 port. The CSV-1584 has an MST hub so it can accept DSC and decompress that for displays that don’t have DSC. HBR3 x2 with DSC is enough for two 4K60 displays (CVT-RB timing, not HDMI timing). However, macOS doesn’t support MST for multiple displays, so you’ll be limited to a single display. It can maybe do 4K120 (CVT-RB2 timing, not HDMI timing) and 8K30 (CVT-RB timing, not HDMI timing).

I don’t think I’ve seen an MST hub yet that can decompress 10 bpc (required for HDR). In that case you might be using 4:2:0 instead of the superior DSC.

 

[joevt]

DP++ means DisplayPort Dual Mode which means you can use passive (requires DP++) DisplayPort to HDMI adapters. Passive means the DisplayPort port can output an HDMI signal and all the adapter has to do is change the voltage.

DP++ is usually limited to 4K30 or 1440p60.

Of course, you could also use an active DisplayPort to HDMI adapter. Active means that it converts DisplayPort protocol to HDMI.

The B273HU is only 2048 x 1152 62Hz. I think that resolution only requires HDMI 1.0 so it should be able to work with any DisplayPort to DVI or HDMI adapter.

HDMI 1.0 is limited to 1920 x 1200 60Hz.
HDMI 1.4 is limited to 4K30 or 2560 x 1600 60Hz.
HDMI 2.0 is limited to 4K60.
HDMI 2.1 is limited to 4K120, 8K30, maybe 4K240, 8K60.

Each version can support all the older versions.

You may want a newer adapter if you want to use it with a newer computer and display in the future.

[joevt]

Where does it state DVI-I?

The female DVI connector on the CAC-1010 is able to connect a Dual Link DVI-I cable (which means it can connect any DVI cable) but the signal is only Dual Link DVI-D because the CAC-1010 has no digital to analog conversion for VGA.

https://en.wikipedia.org/wiki/Digital_Visual_Interface

[joevt]

CAC-1336 but I don’t know if it works with the PS5 and Apple Studio Display combination or with the PS5, Elgato HD60X, Apple Studio Display combination.

Since the Elgato HD60X is limited to HDMI 2.0, a CAC-1332 might be sufficient. The CAC-1333 is similar but doesn’t include a USB 2.0 connection which might be useful for the USB features of the display. The CAC-1334 is a cable version of the CAC-1333 adapter.

I think only the CAC-1335 and CAC-1336 can support 5K resolution. I don’t know if PS5 supports 5K. All other older HDMI to DisplayPort or USB-C adapters/cables are limited to 4K.

[joevt]

You are referring to the CSV-3242HD ?

If it’s not a problem with the dock, then it may be a problem with DisplayLink drivers? Are they up to date?
https://www.synaptics.com/products/displaylink-graphics/downloads/windows

The CSV-3242HD uses the DisplayLink™ DL-3900. There are newer chips.
https://www.synaptics.com/products/displaylink-graphics/integrated-chipsets
https://www.synaptics.com/products/displaylink-graphics/displaylink-products-list

A simple adapter would be least expensive:
https://www.club-3d.com/en/detail/2413/usb3.2_gen1_type_a_to_displayportt1.2_dual_monitor_4k60hz_video_splitter/

[joevt]

A USB-C dock with USB 3.x ports will have a DisplayPort 1.4 port that has half the bandwidth of a normal DisplayPort 1.4 port.

1440p@144Hz would probably require DSC in that case. Both your display and GPU would need to support DSC. Without DSC, you would be limited to 8bpc color or you would have to switch to 4:2:2 instead of RGB or 4:4:4. You might have to switch to a slightly lower refresh rate for RGB/4:4:4 8bpc. I think HDR requires 10bpc.

If USB 2.0 is good enough, Cable Matters has a USB-C dock with USB 2.0 ports and full bandwidth DisplayPort 1.4 port.

[joevt]

If the manual doesn’t describe such a method, then it probably doesn’t exist. In that case, I would contact club-3d email support directly.

As for the limited number of ports, I would consider adding a USB 3.1 hub. One nice thing about USB 1.1/2.0 devices is that they are completely separate from USB 3.x devices (different wires).

Before doing that, there’s a couple other ideas to try:

1)
What happens if you switch the mouse and keyboard in the USB 2.0 ports? The installation guide seems to indicate that there’s no difference between the mouse and keyboard port so probably there’s no change in behavior but it’s worth a try.

2)
Most USB keyboards can act as a USB hub (they have one or two downstream USB ports). What happens if you connect the mouse to the keyboard? Maybe the mouse traversal functionality will be eliminated if there’s a hub between the mouse and the USB 2.0 port of the KVM.

[joevt]

Info about that mouse traversal functionality is at:
https://www.club-3d.com/en/detail/2591/hdmi_kvm_switch_for_dual_hdmi_4k_60hz/

The functionality seems to work without installing extra software to the PC. It doesn’t know where the edge of the display is. It works by assuming that if you move the mouse long enough to the right, that you want to switch the KVM to the other PC.

Maybe you can disable this mouse traversal functionality by moving the mouse to one of the USB 3.1 gen 1 ports?

[joevt]

There is a small bandwidth overhead with MST hubs. You may find that using CRU (Custom Resolution Utility) to create a 4K117 mode might help. Just decrease the refresh rate until it works. Or start from 110Hz and increase the refresh rate until it stops working.

[joevt]

Club-3d has MST hubs. They have DisplayPort 1.4 and 1.2 models. I don’t know if their DisplayPort 1.4 MST hubs support DSC or not. I have not tried any of them.

CSV-7200 DisplayPort 1.4 DisplayPort to Dual DisplayPort (no DSC?)
CSV-7220 DisplayPort 1.4 DisplayPort to DisplayPort + HDMI (DSC)

CSV-1550 DisplayPort 1.4 USB-C to Triple DisplayPort (DSC)
CSV-1555 DisplayPort 1.4 USB-C to Dual DisplayPort (no DSC?)
CSV-1552 DisplayPort 1.4 USB-C to DisplayPort + HDMI (DSC)

CSV-6400 DisplayPort 1.2 DisplayPort to Quad DisplayPort (no DSC)
CSV-6200 DisplayPort 1.2 DisplayPort to Dual DisplayPort (no DSC)

I would try the CSV-7200 or the CSV-6400.

The MST hub I did try was the Delock 87737. I had to use a firmware update to get DSC support.

Probably all the MST hubs use a Synaptics chip.
https://www.synaptics.com/products/video-interface-ics

All the MST hubs I tried do not seem to be able to decompress 10bpc. So if you get an MST hub that supports DSC, then maybe you can make it not output DSC by switching output to 10bpc in the Nvidia control panel. 10bpc is usually required for HDR.

Not being able to use DSC for 10bpc reduces greatly the number of displays you can connect to the MST hub. But you’re not using the MST hub to connect more displays and you don’t want DSC. You’re using the MST hub to force DSC to not be used.

An MST hub isn’t really useful for connecting more displays to an Nvidia GPU because the Nvidia GPU can only connect 4 displays and usually already has enough ports for that. An MST hub is more useful for laptops that don’t have enough ports.

An MST hub can convert fast&narrow DisplayPort to slow&wide DisplayPort. For example, a DisplayPort to Dual Link DVI adapter is HBR x4 but a USB-C dock is usually HBR3 x2. The MST hub can convert HBR3 x2 to HBR x4 so that the adapter can achieve 2560×1600 60Hz, otherwise the adapter would be limited to 1920×1200 when connected to the dock.

[joevt]

A DisplayPort to HDMI 2.0 adapter is way to exclude DSC. You tried that with the CAC-1080 but got the Failsafe issue.

You could use a DisplayPort 1.2 MST hub to disable DSC. DisplayPort 1.2 has slightly more bandwidth than HDMI 2.0 and you don’t have to worry about HDMI conversion issues.

There are also DisplayPort 1.4 MST hubs which may have older firmware that does not support DSC. I had a couple of those but have since updated their firmware to support DSC. If you get one that supports DSC, you might be able to get a firmware that removes DSC support.

You should ask Nvidia to add an option to disable DSC to eliminate the issue described in
https://nvidia.custhelp.com/app/answers/detail/a_id/5338/kw/dsc

DSC is required for 4K144. DisplayPort 1.4 without DSC can do 4K120 but only at 8bpc. I think 10bpc is required for HDR.

[joevt]

The CSV-7210 is probably a dumb switch. It will pass whatever HBR2 signal it gets. That means it can’t block 1440p144 unless that mode requires HBR3 which it does not. The only thing that could cause it to fail is bad signal from low quality cables – but that problem is exactly the same for 4K60.

[joevt]

The CSV-1568 is a USB-C dock which uses a USB to Ethernet adapter.

Is the HP dock also USB-C?

What USB Ethernet adapter do each of the docks use? Check the vendor and product ID in Device Manager.

Maybe you can get a firmware or driver update from the USB Ethernet adapter vendor?

There’s a description of MAC Passthrough at:
https://www.dell.com/support/kbdoc/en-us/000143263/what-is-mac-address-pass-through

You want to somehow replace the MAC of the USB Ethernet Adapter with the MAC of the HP laptop. If you can’t find a driver or firmware that will do the job, and you can’t allow the MAC of the USB Ethernet Adapter of the dock to have access (computers can have more than one MAC), then you need to use a USB Ethernet Adapter that supports passthrough – either by replacing the dock (the HP dock works) or connecting a separate USB Ethernet adapter (possibly one that is the same as the one used in the HP dock).

[joevt]

Driver Genius from https://www.driver-soft.com/ can help find drivers and keep them up to date. I use it on all my Macs and PCs running Windows 10. I don’t know if it will help with your Radeon R9 270 issue though.

[joevt]

Is the display detected at least? Maybe you need to check the display mode. Choose a 4K or 1440p mode, RGB. Check the EDID with Custom Resolution Utility.

Maybe search elsewhere for help. Google the following:
“apple studio display” “windows”

On MacRumors.com, one of the results is:
https://forums.macrumors.com/threads/apple-studio-display-windows-compatibility.2338993/

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