I have explored the Internet. I have done all that is advised. No result. I like to know whether my efforts are baseless due to technical difficulties or not.
Mac Pro, macOS 13.5
what diagonal measurement display?
what model number display, exactly?
How many and what kind of sub-leads are in its lead-in cord? {MagSafe, USB-S, Mini DisplayPort, ThunderBolt-2, Firewire, others}
what cables and adapters are you using to make the connection?
did this setup ever work for you before?
Dual-Link was easy to implement on those huge 2010 graphics cards, but gets pricey if you have to create it later.
The single-link adapter I posted is just an example from a California company that knows what they are selling. If you find a local equivalent DON'T pay that expensive shipping charge.
As long as you're a is not OVER 1920 wide, you don't need Dual Link. Dual Link was a way to deal with the high data rates, when the screens got too wide. Today, we can recognize it was a step in the wrong direction, and has not been incorporated into other interfaces.
when going wider than 1920 wide, the three color signals are split and the center six pins are also used (three pairs) medium blue on this diagram.
.single-link does not need those six, and they are sometimes not even connected.
I apologise for not interacting for a few days - other interests intervened. Meanwhile I made some last effort and bought an adapter sold by AC Works consulting. It combines a DVI, HDMI and a VGA.
Surprise, surprise: this worked.
I have tried to keep everything the same, but there may be other variables but the said adapter. It seems that this is the solution, however: it was the main change.
I thought you might like to know this - given your expertise.
Thank you for your responses. They kept me searching!
Mac Pro 2010 does not have any USB-C ports. How were you making the connection on your older Mac?
Dual-Link DVI is only required for displays WIDER than 1920 wide.
If yours is indeed the A1081: Apple Cinema Display 20-Inch (Aluminum)
it has a maximum resolution of 1680 by 1080, and only requires a Single-link DVI adapter from USB-C.
Only the 30-in model in that line, at 2560 by 1600, Requires a Dual-Link adapter.
I have not seen any users who had problems using a Dual-Link adapter instead, but generally no one is willing to pay the Premium for Dual-Link unless they need it (and you do NOT need it).
an adapter like this one would suffice:
Monoprice Select Series USB-C to DVI and USB-C (F) Dual Port Adapter - 15243 - $8.21
.
Converter HDMI <-> DVI for displays 1920 or lower width are "just wires" -- readily available and cheap.
As we have been discussing, above 1920 wide, DVI splits into Dual Link and brings in three more data conductors in the center.
HDMI took the other path, and just cranked up the speeds. They created improved cables, but there is no clear demarkation of what is expected to work at what speeds. Then to get above 4K size, they re-assigned the pins and completely changed the timing, without changing the connectors. This makes connecting high-end HDMI displays seem like "black magic".
Thank you for responding.
My answers:
I am using the cable of the 22" screen as well as a Startech adapter (part CDP2DVIDP): Dual link DVI from usb c.
I used the screen (Cinema HD) up till last week with a Mac Pro 2010. The screen worked perfectly. The Mac PRO crashed terminally (I can't repair), so now I haveIT replaced by a Mac Pro 2019. I have a 20" Cinema HD. It worked with the adapter (there was a good image), but there were permanent red lines on the screen as well.
Very clear and informative. I never really understood the difference between single and dual. Thank you.
Yes, I understood that you gave an example. At the same time I am clinging to any straw! I found a cheap version: £ 13.
I sent the StartTech adapter back to the seller. I assume that my copy is not working properly - given the fact that it worked on one of my screens (the smaller one), albeit not entirely correctly. I am now free to get the simpler adapter. Would you do that as well?
aluminum surround?
A1081
or Ice and snow lexan polycarbonate surround?
Cinema Display HD M8536
??
Yes, aluminium surround (the first picture).
That sounds like a good way to proceed.
I use the 30-in Apple cinema display that requires dual-link, because it is wider.
I understand now.
Thank you for your advice. I will proceed - but the results will not immediately available. We reach the weekend!
I try to connect a Cinema HD to my Mac Pro 2019. It is recognised, but the screen remains dark
