M3 Max MBP Not working with 30" ACD (Worked with M2 Max) Screen split into 3 sections

Hey, same exact issue with an old DVI-only 30" from NEC. I tried and tested many different combo of USB-C to DVI adapters / cables but none worked, until yesterday I tried a different route that finally worked:

you have to use the USB-C to Mini DisplayPort adapter and a Apple Mini DisplayPort to DVI adapter (the active one, with USB-A port and cable) in serie. Then connect the Apple adapter and the display with a DVI-D Dual-Link cable.

Note that for the Apple adapter to work the USB-A split-end cable needs to be inserted into a powered USB-A port. It has a passthrough port though, so you regain the lost port anyway.

Hey, same exact issue with an old DVI-only 30" from NEC. I tried and tested many different combo of USB-C to DVI adapters / cables but none worked, until yesterday I tried a different route that finally worked:

you have to use the USB-C to Mini DisplayPort adapter and a Apple Mini DisplayPort to DVI adapter (the active one, with USB-A port and cable) in serie. Then connect the Apple adapter and the display with a DVI-D Dual-Link cable.

Note that for the Apple adapter to work the USB-A split-end cable needs to be inserted into a powered USB-A port. It has a passthrough port though, so you regain the lost port anyway.

I also had this exact issue today when my new M3 Max 14" PB arrived. I installed the Sanoma 14.4 and problem solved. Fortunately. Although I do still have the old powered Display Port to AVI connector as suggested by madsalmard206 below, I dont have USB C to DisplayPort and couldnt find one online so I was worried I would not have a solution. It's got nothing to do with batteries or sleep.

OK, got that. Now, disable Sleep and see if it works? In addition to the link I've provided, for the MacBook under Battery, be sure to check and set the hard disks to "Never Sleep".

I too am having this issue with the M3 Max in a 16 MacBook Pro. This is my only external monitor connected to my MBP. Previously I was using a 2018 intel 15' MBP with this set up and it worked perfectly. Like Rorydaredking I am using the Club CAC-1510 adaptor (Dual DVI to Usb-c).

I've tried all different ports on the MBP M3 max, on ac and on battery, played in the settings and still nothing. I tried a friends MBP 14 M3 and it worked flawlessly.

Hopefully this will be resolved shortly.

"but only one display wakes from sleep." - disabling Sleep might fix.

Sleep is unnecessary and should be disabled. Shut for long absences/idle overnights (i.e. do not manual-sleep), and for regular operation, use the settings exactly as shown here Wake up a remote Mac mini - Apple Community, should fix.

Snapshot please of your Battery settings? Ignoring the rest of the mp3...

That's easy, shut when not in use or during long absences.

Your display is obsolete and the DVI is older than ancient-prehistoric. If that's what you mean by "long-established", it's not a reason for Apple to fix.

Anyway, give it a shot before finding an issue with it. Sleeping gets you nothing, your laptop boots up in under a minute. So shut when not in use.

In that case set the Saver exactly as shown in the link included in my first post.