[joevt]

Unfortunately, this forum does not sort threads by last post date so no-one will see this unless they click on page 47.

[joevt]

Do the displays have a DP 1.2 mode switch? That can do 4K60 10bpc without DSC.

DP 1.3 has the bandwidth of DP 1.4 but without DSC. Does it have a DP 1.3 mode?

The Nvidia limitation with DSC is described in
https://nvidia.custhelp.com/app/answers/detail/a_id/5338/~/using-high-resolution%2Frefresh-rate-displays-with-vesa-display-stream

It seems to indicate that you might get around that by using a lower bandwidth display mode. Try selecting 4K60 for each display. If that works, then maybe you can try higher resolutions. 4K95 is the max CVT-RB timing for 10bpc. 4K118 is the max CVT-RB timing for 8bpc.

Display Stream Compression capability is described in the DCPD info of DisplayPort. You would need a DPCD emulator to override that. Or a driver patch.

I suppose a DisplayPort MST hub would just pass through DSC even if the hub doesn’t support DSC itself?

A DisplayPort to HDMI 2.0 adapter will negate DSC. HDMI 2.0 can do 4K60 8bpc.

[joevt]

Post it somewhere and I can decode it using edid-decode from v4l-utils (it’s a Linux open source project which I can compile for macOS).

Or you can convert it to hex and copy the hex bytes to here. the first 8 bytes should be
00FFFFFFFFFFFF00
then I can decode that.

[joevt]

Sorry. I forgot we were dealing with dual link DVI. Yes, a dual link DVI adapter is required for 1440p60.

However, single link DVI should be sufficient to ensure an EDID that is not modified by the adapter.

Use the Export button to export the EDIDs from CRU for each connection type.

[joevt]

CRU is a utility that can extract EDID. It is mentioned in https://insights.club-3d.com/thread/cac-1088-support-for-2560×2880-resolution/

Maybe you can post the hex of the EDID here and I can use edid-decode to parse the result.

Since the display is DVI, you might try a passive HDMI to DVI adapter or cable to connect the display if your PC has a HDMI output. Get the EDID for that connection type as well so they can be compared.

Do you remember if you got the HDCP-ON or HDCP-OFF version of the CAC-1010? Maybe try e-mail [email protected] again and specify that you want the latest firmware for both versions.

[joevt]

I believe the change made with the override EDID that you created using CRU can be used right away by disconnecting and reconnecting the display. This might be preferable to using the Reset option provided by CRU (it’s another executable in the CRU app folder?) which can enable the EDID override without disconnecting the display.

[joevt]

The snow is translucent so you can sort of see the desktop and windows through the snow?

That’s a complicated effect. I would like to see a photo of that. I suppose the OS has a HDCP requirement that the adapter doesn’t meet so the OS obscures everything with that static/snow.

What display do you have? Did you check the EDID to see if it supports HDCP?

[joevt]

Is the snow only in some open windows or all open windows? Which windows? Is It only inside windows that are supposed to contain videos from streaming apps like netflix?

[joevt]

Can you see this?

[img width='' height='']https://insights.club-3d.com/wp-content/uploads/2025/02/fpBgo.gif[/img]

 

[joevt]

CRU is for Windows. Use SwitchResX for Mac.

[joevt]

The product page says it supports up to 7680×4320. Therefore, 2560×2880 should also work.

Use CRU to extract the EDID for DP, HDMI, and CAC-1088 connections. Compare all three.

Extract the 2560×2880 timing info from one of the first two EDIDs, and add it to the third case if it is missing.

https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU

Post results here if you are successful or need more help.

[joevt]

Your computer has Windows 11 and Linux. Without changing any connection, the CSV-1585 works in Windows but not in Linux? Therefore, the problem is with the drivers of the GPU of your computer.

What computer do you have?

What GPU?

What GPU drivers?

Does the USB-C port that the CSV-1585 is connected to support a display in Linux without the CSV-1585?

CSV-1585 has a DisplayPort MST hub. Does the Linux GPU driver support MST?

[joevt]

Oh, ok. I thought fuzzy meant everything was basically usable except for some fuzziness.

I think the snow described in that thread is more like random noise like a TV tuned between channels where nothing is visible. And the snow is coloured – not just black and white – which means all the RGB values are randomized? Like this? https://i.sstatic.net/fpBgo.gif

 

[joevt]

To be clear, your issue is like that which is pictured at
https://insights.club-3d.com/thread/flickering-problem-with-cac-1510-a-and-apple-cinema-display-30-on-mac-mini-m1/

?

I don’t think that’s an issue that can be corrected with firmware.

Club-3d has not acknowledged the issue because they have no way to fix it.

[joevt]

I think they have a guy that checks the mail once per week 🙂

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