I purchased the CAC-1010-A (HDCP off) Dual-Link DVI to DisplayPort converter to connect my 30″ Apple Cinema HD Display to my Windows 11 PC which has an Intel Arc A750 graphics card. The monitor connected and is displaying at 1080 x 800 resolution, but it doesn’t provide any options above this (in particular the 2560 x 1600 that I’m wanting to use). The only options available for me are 800 x 600, 1024 x 768, 1280 x 600, 1280 x 720, 1280 x 768, and 1280 x 800.
I have the USB cable connected and confirmed it’s working because I tried unplugging the USB and the display went black. I’ve made sure that everything is up to date through Windows Updates, and tried the Intel Arc Control to manage the resolution, but it just uses the native Windows display management (which I was already using, with the options listed above).
I’ve tried emailing [email protected] about this, but haven’t had any response after two days, so I thought I’d try here too.
If anyone has any suggestions, it would be greatly appreciated.
Apple 30″ Cinema HD Display CAC-1010-A missing 2560×1600 on Windows
- Liked by
I tried CRU before, but assumed I did something wrong. After watching your linked video, it seems like I did things correctly, but all it does is lock the resolution to 1280×800. I’ve attached screen shots in the order of trying it:
CRU starts with having the 2560×1600 option, in the second slot (and Windows has its options shown behind):
I moved the 2560×1600 option up to the top:
After closing CRU and running restart64 (note that the option in Windows is set to 1280×800 and is disabled):
Going back into CRU, it shows that it’s actively using the customization (but I’m still stuck on 1280×800):
Did I just do something wrong with CRU?
- Liked by
In CRU, you can click the Edit… button next to the display name and change the display name. That will show that the custom EDID is definitely being used. Note that the custom EDID only applies to the port that the display is currently connected to. To apply the custom EDID to other ports, you can use CRU to copy the EDID from one to the other.
Is the CAC-1010-A connected directly to the Intel ARC A750? The CAC-1010-A (and every other DisplayPort to Dual Link DVI adapter) requires 4 lanes of HBR to do 2560×1600. A USB-C hub usually only has 2 lanes of DisplayPort.
Have you tried clicking Advanced Display Settings then clicking on Display adapter properties and List all Modes?
It seems like it is using the custom EDID. I clicked the Edit… button and changed the name to Mac Cinema HD, clicked OK, then ran restart64 and it now shows as Mac Cinema HD in my Windows display settings (and still locked to 1280×800).
The monitor’s dual-link DVI is connected into the CAC-1010-A (and the monitor’s USB is connected to the PC to power its additional USB ports), and the CAC-1010-A is connected to the Arc A750 through one of the DisplayPort terminals, and has its USB cable connected to the PC. There’s no USB-C hub or anything else in between the connections.
I hadn’t tried the List All Modes from the Advanced Display Settings before, but trying it out now, it just lists basically the same options I was seeing before:
1280 by 800, True Color (32 bit), 60 Hertz
640 by 480, True Color (32 bit), 60 Hertz
800 by 600, True Color (32 bit), 60 Hertz
1024 by 768, True Color (32 bit), 60 Hertz
1280 by 600, True Color (32 bit), 60 Hertz
1280 by 720, True Color (32 bit), 60 Hertz
1280 by 768, True Color (32 bit), 60 Hertz
I tried going into that menu again after attempting to use CRU to set the resolution to 2560×1600, and now it only lists one option: 1280 by 800, True Color (32 bit), 60 Hertz
- Liked by
A small update: I was able to get my hands on an old video card that has the native dual-link DVI input support and installed it into an older Windows 10 PC. After connecting the monitor directly to it (without the CAC-1010-A), I was able to simply choose 2560×1600 resolution from the Display settings in Windows. Unfortunately, this isn’t a real solution, since the new PC with the Arc A750 needs to work with the monitor, but it makes me suspect the CAC-1010 -A. Is there anything I can do to troubleshoot the adapter?
- Liked by
Have you tested the adapter with any other GPU or computer? Maybe it’s an issue with Intel ARC.
Did you check the EDID of the display to determine if it supports HDCP or not? There are old 30″ Cinema HD Displays that don’t and newer ones that do. Maybe a firmware update to the HDCP-ON firmware might change things but I don’t know how that could help get 2560×1600 if 1280×800 already works.
- Liked by
Drivers. Of course! 🙂 Glad it’s working for you now.
I usually use Driver Genius to to keep my drivers up to date, though sometimes (rarely) it might find something you don’t want to install. For example, it was using an NVMe driver that Samsung Magician doesn’t support. But there’s a way to switch drivers in a situation like that and to hide the offending NVMe driver from Driver Genius.
- Liked by
