Mac mini monitor slow to wake up from sleep

Jacobi

macrumors member
Original poster
Aug 8, 2012
47
376
I have my Mac mini connected to a Dell U2415 using a Cable Matters USB C - Displayport cable I got on Amazon. When I press the space bar to wake up my Mac mini from sleep, it takes 10-12 seconds before the display actually turns on. If I connect to the same monitor using HDMI, it wakes up almost instantly. However, I prefer not to use HDMI because my Mac mini thinks the monitor is a TV and doesn't use the correct color mode.

Any thoughts on what might be going on? For what it's worth, I tried a second brand of USBC-DP cable (uni accessories, also from Amazon) and the same problem occurred.
 

Erehy Dobon

macrumors regular
Feb 16, 2018
174
124
While I am neither using the same monitor nor cable, my first thought would be to check the monitor manufacturer's support website to see if there's a firmware update that might help matters.

For what it's worth, my LG 27UL850-W monitor is plugged into my Mac using the USB-C/DisplayPort cable that LG included in the box. The setup appears to be fine.
 

Fishrrman

macrumors P6
Feb 20, 2009
17,152
5,517
"If I connect to the same monitor using HDMI, it wakes up almost instantly. However, I prefer not to use HDMI because my Mac mini thinks the monitor is a TV and doesn't use the correct color mode."

There's "a fix" for that.
Here it is:
================================
Download the file "patch-edid.rb" from here:
http://embdev.net/topic/284710#3027030
(download link at post in above URL)
(I've attempted to attach it below)

Put the "patch-edid.rb" file into the downloads folder.

Launch terminal

Type : cd ~/Downloads

Type : ruby patch-edid.rb

Normally, a new folder appear on the Downloads folder with a name similar to (but may not be exactly the same) "DisplayVendorID-5a63"

Move this folder to
/System/Library/Displays/Contents/Resources/Overrides
(the system will ask for the password)

Reboot
 

Attachments

DezoSLO

macrumors newbie
Apr 24, 2019
2
0
I have the same problems, it takes a long time to wake my Dell U2518D connected via HDMI.

Does anyone have a solution for that?
 

menpan

macrumors newbie
Feb 27, 2019
3
1
I have my Mac mini connected to a Dell U2415 using a Cable Matters USB C - Displayport cable I got on Amazon. When I press the space bar to wake up my Mac mini from sleep, it takes 10-12 seconds before the display actually turns on. If I connect to the same monitor using HDMI, it wakes up almost instantly. However, I prefer not to use HDMI because my Mac mini thinks the monitor is a TV and doesn't use the correct color mode.

Any thoughts on what might be going on? For what it's worth, I tried a second brand of USBC-DP cable (uni accessories, also from Amazon) and the same problem occurred.
I have the same monitor and when my computer goes to sleep, the only way to wake up the monitor is to turn off the mini. I'm very disappointed with Mac mini. I have also tried several different cables but none of them worked. Dell doesn't provide any drivers for Mac OS, at least for U2415.
 

Hessel89

macrumors regular
Sep 27, 2017
226
114
Arnhem
I actually have the same problem on my UF5K. Takes 5-10 to wake up from sleep on my Mac Mini while it wakes up instant when connected to my Macbook Pro