Recovery Mode and 5K in High Sierra

10/7/2017

Just fired up the Dell UP2715K and can confirm this is still able to do 5K and Retina HiDPI resolutions.

The Terminal Command is still:

sudo nvram boot-args=nv_spanmodepolicy=1

Problem is, you need to have SIP disabled to enter this.

Good news is our EFI cards all let you get to Recovery Mode to disable this.

Just Hold "Command-R" (we used to call it Apple-R when we thought different) at boot, the Recovery Partition is no longer a Partition, and will not show as a Boot Option

Under Utilities is Terminal, pop the baby open and type

csrutil disable

Reboot into HS and run the above. Still have to power cycle the UP2715K to get the 5K to kick in

4 Comments

Gravino

10/9/2017 07:50:46 am

Before update my Mac Pro to macOS 10.13 (17A405) the mac not start and continuously loop reboot width screen "Your computer restarted because of a problem".

I solved the problem width this solution http://www.macvidcards.com/how-do-i-install-new-drivers-if-i-cant-boot-without-drivers.html, but first doing to disable a csrutil (https://lifehacker.com/how-to-fix-os-x-el-capitans-annoyances-1733836821).

Before update the driver work perfectly but width cuda driver 8.0.90 have a message " Update required ℹ️ ". Screenshots https://imgur.com/a/oSr7a

GTX 970 Macvidcards
Nvidia web driver 378.10.10.10.15.117
Mac Pro 5.1

Javi

10/9/2017 10:10:52 am

Hi!

After I upgraded my Mac Pro 5,1 to High Sierra from Sierra, with a 970gtx and a Dell 2715k, the 5K resolution still worked; since it still had the cursor bug on one of the panels, I unplugged and changed the order of the DP cables... and after that it stopped working in 5K. After a PRAM reset, I had to reinstall High Sierra since it stopped booting... and now with my new clean High Sierra installation ready, I have not been able to get 5K resolution again. The command that you post here doesn't work for me, it doesn't make any difference since it already comes configured with it without modifying it.

What can I do? What am I doing wrong?

Thank you!!

dave link

10/9/2017 12:21:39 pm

you need to clarify where it breaks

"it doesn't work" doesn't help

What response do you get when you enter the code in terminal?

Are you running with SIP disabled?

Javi

10/10/2017 01:24:54 am

I can't access my Mac Pro right now, but the response I get is something like it's already set like that (there's nothing to change, already set to nv_spanmodepolicy=1 ; and if I use the command in your guide to check, it's correctly set).

I've tried both with SIP enabled and disabled.

And have had this setup running for the last year and a half, so I've tried this procedures before.

I've also tried it with a RX580 and it only natively supports 4K; also, Rob from Bare Feats has confirmed it neither works with the Vega card he's testing (at least not natively).

Maybe Apple has stopped support for the 2715K on High Sierra?

Recovery Mode and 5K in High Sierra

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