Screen tearing on 4k display when using DisplayPort

Originator:drew.cassidy
Number:rdar://24714124 Date Originated:Feb 17, 2016
Status:open Resolved:
Product:Mac Product Version:13" Macbook pro (retina, late 2013)
Classification: Reproducible:always
 
Summary:
When my computer (config below) wakes from deep sleep with my 4k display (Dell P2415Q) connected via either mini-DP port, it suffers from screen tearing. unplugging the monitor from the computer and plugging it back in fixes the problem. I do not see it when using the HDMI out

Steps to Reproduce:
1. connect to Dell P2415Q via the mini-displayport on the mac + the full size DP on the monitor
2. put the computer to sleep (I do not know how long it takes to enter deep-sleep, but this only happened when several hours passed while the computer was asleep) do not close the lid
3. wake the computer. the monitor will show screen tearing (especially visible while switching spaces quickly)

Expected Results:
no screen tearing on the display

Actual Results:
screen tearing on the display

Version:
Mac OS X El Capitan (10.11.3)
Macbook pro (retina 13-inch, late 2013)
2.4ghz Intel core i5, 8GB ram, Intel Iris pro GPU

Notes:
both displays set to default scaling

Configuration:
Only happens with the Mini-display port on the mac, not HDMI. did not test with the mini-DP on the monitor because I do not have a cable of that type, only full size to mini. 

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