rotorsport Posted December 30, 2020 Share Posted December 30, 2020 (edited) imac 27 inch 2019 just did the update to the big sur and now whenever the computer goes to sleep it will not wake Sleep Wake failure in EFI I have been reading some comments and realize this is a problem, can someone give me a hand fixing this? I reinstalled the operating system I did the SMC and reset the NVRAM with directions from applecare I'm beginning to think they don't know much about their own computers or atleast the guy I got! Charles Edited December 30, 2020 by rotorsport Quote Link to comment Share on other sites More sharing options...
rthpjm Posted December 31, 2020 Share Posted December 31, 2020 What connection type do you use for your mouse and keyboard? Wires (USB), or wireless (Bluetooth)? Quote Link to comment Share on other sites More sharing options...
rotorsport Posted December 31, 2020 Author Share Posted December 31, 2020 (edited) wireless for the mouse and USB for the keyboard The computer ways working fine until I did the upgrade to the Big Sur Edited December 31, 2020 by rotorsport add a file Quote Link to comment Share on other sites More sharing options...
rthpjm Posted December 31, 2020 Share Posted December 31, 2020 Hmm. Since you say that you have spoken to AppleCare, I will assume that you’re using an Apple iMac rather than a hackintosh?... The first line of the problem report says “Sleep wake failure in EFI” which perhaps gives us a area to consider. If you are using a “real” iMac, then the EFI partition should just contain Apple code. Can you confirm that you are not using a third party boot loader (e.g. Clover or OpenCore)? If you are “pure Apple”, then did you encounter any problems during the update process? If Apple ships an EFI update alongside the OS, then the install process typically reboots at least twice (sometimes more). Sleep/wake can be affected by peripherals. Try disconnecting the USB devices (Dymo, printer, etc...). Also check with the makers of your peripherals to see if they have any software updates. The transition from kernel extensions KEXTs to DriverKit extensions DEXTs moves a step forward with Big Sur. It’s worth checking. You can also try “safe mode” it disables non-Apple extensions. This may help prove the issue is related to a peripheral or some other piece of non-Apple software. Quote Link to comment Share on other sites More sharing options...
rotorsport Posted January 1, 2021 Author Share Posted January 1, 2021 yes I'm using a 2019 Imac I'm guessing I'm on the wrong site? no third party no problem with the install I have disconnected all peripherals I do have parallels loaded with windows 10 Charles it is still giving an error Quote Link to comment Share on other sites More sharing options...
rthpjm Posted January 1, 2021 Share Posted January 1, 2021 This Reddit post discusses similar symptoms. Mainly for MacBooks although it may still be relevant to the iMac. Some say that a second SMC reset worked for them. Some say they get the symptoms after swapping to a third party SSD, in these cases using the Terminal command line pmset command to disable hibernate helped. Some say it was a fault and AppleCare exchanged their platform Quote Link to comment Share on other sites More sharing options...
rotorsport Posted January 1, 2021 Author Share Posted January 1, 2021 Thank You, I will go thru the process again and do the ressets and give it a try Thank You for your assistance Charles Quote Link to comment Share on other sites More sharing options...
rotorsport Posted January 2, 2021 Author Share Posted January 2, 2021 so Disconnected all the peripheral devices, and update all the drivers and reset the SMC and NVRAM so far it looks like I might have success. it has run this afternoon and gone to sleep and woke as it should, so here is to fingers crossed. Charles Quote Link to comment Share on other sites More sharing options...
noah977 Posted January 5, 2021 Share Posted January 5, 2021 I would stay away from Big Sure now. Catalina more stable. AND Big Sur has some major privacy/security issues. Quote Link to comment Share on other sites More sharing options...
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