morpheousman Posted February 1, 2021 Share Posted February 1, 2021 I have Big Sur running well on my Optiplex 9020, with Opencore. It should support 4K, but only with DP to DP cord. I can't test 4K because I don't have a monitor with DP input. I have tested Internal graphics, they do work with a DP to HDMI cable. I am presently using a GeForce GT710 2GB graphics card. I have been using it since Catalina because I need reliable dual-screen and also because it works OOB. Installation: First thing is to flash bios to A25. Then disable CFG Lock, and set DVMT to 64MB for 4K video. The tool "modGRUBShell.efi" in the Opencore Tools folder makes this easy to do. Put Opencore folder on an EFI partition on a thumb drive. Boot off the thumb drive, (F12, then select the EFI of the drive), then at the Opencore menu select modGRUBShell.efi. Now at the grub> prompt you type these commands: Command Function setup_var 0xDA2 0x0 this will Disable CFG >>>> Example, at prompt type setup_var then space, then 0xDA2 space, then 0x0 [enter] don't worry about error warning. setup_var 0x263 0x2 this will set DVMT to 64MB Next ones are not needed, but are recommended. These disable EHCx ports which are only needed with Legacy boot. If you are dual-booting with Windows you should be using UEFI anyways. setup_var 0x2 0x1 Enable EHCI Handoff setup_var 0x144 0x1 XHCI Enabled Mode setup_var 0x15A 0x2 Route EHCx Ports to XHCI setup_var 0x146 0x0 Disable EHCx Ports setup_var 0x147 0x0 Disable EHCx Ports Then just type "reboot" and press [ENTER]. In the Opencore folder, open the Config plist and make edits, fill in.... PlatformInfo -> Generic -> MLB PlatformInfo -> Generic -> ROM PlatformInfo -> Generic -> SystemSerialNumber PlatformInfo -> Generic -> SystemUUID Okay now make your Big Sur installer, and place your Opencore folder on the EFI Partition. Boot off drive and select install Big Sur. Anyone with a 4K monitor that has a display port input, please let us know if 4K is working. Lastly, this was composed from reading 3 or 4 guides that I found online. Happy Testing! Edit: Cleaned up the Config. Sound & Sleep now working. Updated Opencore. 9020_OC_066.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted February 1, 2021 Moderators Share Posted February 1, 2021 Is this a MT or SFF? Link to comment Share on other sites More sharing options...
morpheousman Posted February 2, 2021 Author Share Posted February 2, 2021 @Jake, mine is a SFF. I was using your 9020 SFF USB ports kext for a while. After I also changed the ethernet kext, it hung on boot, probably cause I did something wrong to the config, but I went back to the first config and kexts folder to start over again. Another thing, the OC picker actually works with my dual-boot, so I don't need to use F12 to boot Windows. Link to comment Share on other sites More sharing options...
morpheousman Posted April 22, 2021 Author Share Posted April 22, 2021 Update: I'm now running Big Sur 11.3.1. It has been running flawlessly for weeks. Link to comment Share on other sites More sharing options...
hannibal1969 Posted May 25, 2021 Share Posted May 25, 2021 Morpheousman, Thanks. Lets try it. Do I really need that firmware upgrade? Do those setup_var commands stay active after a future upgrade of the firmware or reset bios to default? @Jake Lo, is there a chance https://osxlatitude.com/forums/topic/6006-optiplex-9020-mavericks-el-capitan-sierra-high-sierra-mojave-catalina/ will be updated with big sur / and open core configs etc? Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted May 25, 2021 Moderators Share Posted May 25, 2021 I haven't touch that desktop for a while since I only use my laptop. I'm confident @morpheousman's file work perfectly. No, upgrading firmware does not reset the settings set by setup_var but resetting BIOS to default will. 1 Link to comment Share on other sites More sharing options...
morpheousman Posted May 27, 2021 Author Share Posted May 27, 2021 Directions I had said update to A25, so not a big deal to do on my dual-boot. I have not tried it on any other firmware myself. I also had recent experience where power was off for a bit, and the bios battery needed replacing, all bios edits needed to be done again, but just a 5 minute fix to do them again. Probably the best desktop hack I have had in 15 years or so of doing these. Just about trouble free. Edit: Now Updated to 11.4, and Opencore 0.6.8. 1 Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted June 20, 2021 Moderators Share Posted June 20, 2021 @morpheousman I finally had a chance to convert to OC and tested your files but updated to 0.7.0. For some reason sleep/shutdown and restart doesn't work. I switch back to your 068 version and still same issue, resetting NVRam...nothing works. Getting frustrated, I switch the Lenovo display to the Dell display which was working previously with Clover. To my amazement, with the Dell all was working perfectly even with the update 0.7.0 files. Both displays are 1440p capable, but why Lenovo is causing such issue? Curious... Link to comment Share on other sites More sharing options...
morpheousman Posted June 22, 2021 Author Share Posted June 22, 2021 I am using an Acer monitor. Tested with a DP to HDMI adapter, works fine on 2 different Acer displays. Now I switched back to the GT710 video card and 2 Acer monitors. Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted June 22, 2021 Moderators Share Posted June 22, 2021 Are your displays 2k and above? I get the large stretched boot screen. Seems only way to fix is disable Legacy Option ROMs, but that break sleep / Wake. With Clover, there's csmVideoDxe.efi, wonder if there's an OC equivalent. Link to comment Share on other sites More sharing options...
Recommended Posts