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<< Solved >> New 4K monitor, now have screen flicker

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OK, it works now. Not sure why it didn't before.

Now sleep doesn't work anymore :crazy:
 
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there's a definitely a positive difference in the experience. it's noticeable for sure. It booted faster as well. Thank you so much for helping me. Now just to figure out why sleep stopped :/
 

pastrychef

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OK, it works now. Not sure why it didn't before.

Now sleep doesn't work anymore :crazy:

Is your system having trouble going to sleep or is it having trouble waking from sleep?



there's a definitely a positive difference in the experience. it's noticeable for sure. It booted faster as well. Thank you so much for helping me. Now just to figure out why sleep stopped :/

Cool! Yes, macOS expects iMac18,3 to have IGPU and things will run much better with IGPU enabled.
 
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trouble going to sleep as well as waking. Basically the display turns off, and I can't get it to wake back up from that. The computer doesn't power down or anything.
 

pastrychef

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trouble going to sleep as well as waking. Basically the display turns off, and I can't get it to wake back up from that. The computer doesn't power down or anything.

Please enter the following in to Terminal and post the output:
Code:
pmset -g log | grep -i failure
 
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Code:
2019-03-14 14:08:47 -0700 Failure                 Drivers Failure during wake due to PEG0():          
2019-03-15 13:27:10 -0700 Failure                 Drivers Failure during wake due to PEG0():                                             
2019-03-15 18:12:39 -0700 Failure                 Sleep Failure [code:0xE44E285D00000012]:                                          ...

last message was repeated another 6 times
 

pastrychef

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Code:
2019-03-14 14:08:47 -0700 Failure                 Drivers Failure during wake due to PEG0():         
2019-03-15 13:27:10 -0700 Failure                 Drivers Failure during wake due to PEG0():                                            
2019-03-15 18:12:39 -0700 Failure                 Sleep Failure [code:0xE44E285D00000012]:                                          ...

last message was repeated another 6 times

PEG0 is your video card. I don't know what the last error code eludes to.

The RX 580 should be using Apple's built-in drivers. Which model of RX 580 are you using?

Can you please show me what kexts you have in /Library/Extensions/?
 
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Gigabyte AORUS Radeon™ RX580 8G

drwxr-xr-x 3 root wheel 96 Apr 23 2018 ACS6x.kext
drwxr-xr-x 3 root wheel 96 May 8 2018 ATTOCelerityFC8.kext
drwxr-xr-x 3 root wheel 96 May 7 2018 ATTOExpressSASHBA2.kext
drwxr-xr-x 3 root wheel 96 May 7 2018 ATTOExpressSASRAID2.kext
drwxr-xr-x 3 root wheel 96 Sep 5 2017 ArcMSR.kext
drwxr-xr-x 3 root wheel 96 Aug 31 2013 CalDigitHDProDrv.kext
drwxr-xr-x 3 root wheel 96 May 3 2018 HighPointIOP.kext
drwxr-xr-x 3 root wheel 96 Dec 5 2017 HighPointRR.kext
drwxr-xr-x 3 root wheel 96 Mar 31 2017 PromiseSTEX.kext
drwxr-xr-x 3 root wheel 96 Apr 24 2018 SoftRAID.kext
 

pastrychef

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Gigabyte AORUS Radeon™ RX580 8G

The kexts look fine. Those are installed by macOS by default.

I don't know why you are getting wake failures due to the video card. The only thing I can suggest is to try and use the other DisplayPorts to see if it makes a difference.
 
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OK. I'll play around a bit. I'll see if any of the new kexts is affecting it too. I had committed my EFI to git, so it's easy to see the differences anyway. I'll let you know :)
 
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