I have all the cable types.
I’m not sure what a passive USB3 cable is. Aren’t they all passive except for optical cables? Can your passive USB3 cable do 10 Gbps of USB? Or is it a 5 Gbps USB cable? HBR2 is 5.4 Gbps per line. It might work with a USB 5 Gbps cable.
Any USB-C cable that can do 10 Gbps USB can do 32.4 Gbps DisplayPort 1.4.
A USB-C cable has 4 SuperSpeed lines.
– 10 Gbps USB uses two of those lines, one for receive and one for transmit.
– 20 Gbps USB uses four lines, two for receive and two for transmit.
– DisplayPort HBR3 (8.1 Gbps per line) can use 1, 2, or 4 SuperSpeed lines to transmit up to 32.4 Gbps.
– USB4 40 Gbps (20 Gbps per line) uses two lines for transmit and two lines for receive). A cable rated at 40 Gbps is required (a USB4 or Thunderbolt 3 or Thunderbolt 4 cable).
DisplayPort uses 8b/10b encoding, so 32.4 Gbps on the wire can transmit 25.92 Gbps of data. DisplayPort HBR2 is 17.28 Gbps of data.
HDMI 2.0 (18 Gbps) is three lines at 6 Gbps each using 8b/10b encoding = 14.4 Gbps of data.
HDMI 2.1 is four lines at 6, 8, 10, or 12 Gbps using 16b/18b encoding (for 21.3, 28.4, 35.6, 42.7 Gbps of data). What output rates does the CAC-1336 support?
The amount of bandwidth required for a display mode depends on the pixel clock (MHz) and the bits per pixel (bpp). Just multiply them together.
4K120 is between 1075MHz (CVT-RB2) and 1188MHz (HDMI).
8K30 is between 1019MHz (CVT-RB2) and 1188MHz (HDMI).
between 8 and 16 bpp: DSC
12bpp: 8bpc 4:2:0
15bpp: 10bpc 4:2:0
16bpp: 8bpc 4:2:2
18bpp: 6bpc RGB/4:4:4 or 12bpc 4:2:0
20bpp: 10bpc 4:2:2
24bpp: 8bpc RGB/4:4:4 or 12bpc 4:2:2 or 16bpc 4:2:0
30bpp: 10bpc RGB/4:4:4
32bpp: 16bpc 4:2:2
36bpp: 12bpc RGB/4:4:4
48bpp: 16bpc RGB/4:4:4
With 12bpp, even HBR2 or HDMI 2.0 can do 4K120 and 8K30. Of course, people with a HDMI 2.1 output would prefer not to use 4:2:0.
What DSC target bpp does the CAC-1336 support? slices per line? pixels per slice? pixel rate per slice? slice height? DSC bpc? I’ve seen one DisplayPort 1.4 MST Hub which wouldn’t do DSC with 10bpc – it was limited to 8bpc which means it couldn’t do HDR.
Can the adapter compress or decompress DSC? A DisplayPort 1.4 MST hub can decompress.
What pixel types from the above list does the CAC-1336 support for HDMI input and DisplayPort output? What pixel type conversions can the adapter perform if any?
Can you connect a mouse to the USB-C end of the CAC-1336 and get power? mouse movement?
USB-C DisplayPort Alt Mode supports two connection methods:
– 2 lanes of DisplayPort + USB 3.x
– 4 lanes of DisplayPort + USB 2.0
The CAC-1336 has a micro USB connection so it can only support the latter (if it supports USB data at all, which the CAC-1332 did).
The AORUS-FV43U has a USB-C input and USB type A ports. Did you test the USB type A ports? You would have to switch the display to prioritize resolution instead of USB data since the CAC-1336 can’t provide USB 3.x data. The switch sets the USB connection to USB 2.0 only to allow all 4 SuperSpeed lines of the USB-C cable to be used for DisplayPort. Actually, I can’t find mention of a switch in the manual. The manual says USB-C can be used for the USB upstream (part of the KVM feature), but it doesn’t say if it’s limited to USB 2.0 or not…
The MSI optix mag321curv doesn’t support USB data on its USB-C connection. Seems neither display is a good test of USB data functionality of CAC-1336.
There are gaming monitors that have the 4 lanes DisplayPort + USB 2.0 connection type option.
Also, the LG UltraFine 4K, LG UltraFine 5K, Apple Studio Display (5K), and Apple Pro Display XDR (6K) support the 4 lanes DisplayPort + USB 2.0 connection type (for USB 3.x, they need a Thunderbolt connection instead of USB-C DisplayPort Alt Mode).