I'm now using my nMP with dual Dell P2715Q UHD (4k-ish) displays. They are working pretty great, but there are a couple of issues.
One is that when the system is booting, nothing displays on the screens. That's not a huge deal, but I do use FileVault, so I have to "guess" when to enter my password.
I'm wondering if this can be fixed with a SW update? I believe it happens with other 4K displays as well?
Have you seen this thread?
Or, MacRumors - Mac Pro:
http://forums.macrumors.com/showthread.php?t=1816805&page=22
LOL, yes. I have posts in both of them.
This display bootup issue isn't specific to the Dell monitor from what I gather. It's a general issue with 4K displays on the Mac.
Have yo tried unplugging one monitor and plugging it in? I sometimes have to do that
This happens because the EFI rom firmware in the Mac Pro doesn't know how to drive a 4K SST monitor. A future firmware update will very likely fix this problem. However, Apple typically only does one firmware release a year. One workaround is to hookup to the HDMI port to the monitor in addition to the displayport cable. When you want to start up Filevault, switch the monitor's input menu to select HDMI. Otherwise, switch it back to select displayport.
Ahh ok, that does make sense.
I couldn't figure out why the EFI couldn't just sync at a lower resolution (which the monitor supports), but if it doesn't support SST, that makes sense.
there just weren't any 60hz 4K SST monitors when the EFI was released. It seems like an obvious thing to plan for, but for whatever reason they didn't code for it. As I said, I'd be very surprised if they don't support it in the next EFI update
4K and bootup screens, can it be fixed?
