Administrators Hervé Posted November 21, 2020 Administrators Share Posted November 21, 2020 You said you had HDMI output... so use that! No need to wipe out anything or reinstall from scratch. Just experiment with properties injection in your config file. Link to comment Share on other sites More sharing options...
mefflecakes Posted November 21, 2020 Author Share Posted November 21, 2020 Yep, did have HDMI, then added the lines that jake suggested, now I can't even boot into macos. Not sure if I've done it wrong or there's a conflict but I'm not sure the best way to edit the plist now that I can't boot up. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 21, 2020 Administrators Share Posted November 21, 2020 Use your USB installer key to boot into macOS. Sigh... Clover was so useful in that respect with its ability to choose all sorts of options, including config files, at boot time. Link to comment Share on other sites More sharing options...
mefflecakes Posted November 21, 2020 Author Share Posted November 21, 2020 Ah didn't realise opencore worked the same as Clover in that respect. Will give it a try shortly, thanks. Link to comment Share on other sites More sharing options...
mefflecakes Posted November 21, 2020 Author Share Posted November 21, 2020 Ok, that worked, it's back to booting up again. I'll try what you suggested tonight, gotta do the family thing during the day thanks for the help. Link to comment Share on other sites More sharing options...
mefflecakes Posted November 21, 2020 Author Share Posted November 21, 2020 Ok, so: ----------------------------------------------------------------------- IGPU ----------------------------------------------------------------------- GPU Name Intel HD Graphics 530 GPU Device ID 0x19128086 Total VRAM 1536 MB Free VRAM 0 MB Quartz Extreme (QE/CI) Yes Metal Supported Yes Metal Device Name Intel(R) SKL Unknown Metal Default Device Yes Metal Low Power Yes Metal Headless No I've attached the IORegEx output, cheers! Aaron’s iMac.zip Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 21, 2020 Administrators Share Posted November 21, 2020 Your IOReg shows exactly what would be expected: SKL platform 0x19120000 with 3 x display ports (dummy connector at FB@0 and DP connectors at FB@1 + FB@2). Interestingly enough, but as I thought, your HDMI screen registers against FB@1, i.e. connector 0105; it's got the wrong connector type so you'd never get any audio out but it seems to work Ok on the video front. ideally, you'd inject HDMI type (00080000) to that port/connector (con1). Given that, connecting a DP display to a DP physical port gives you no video, it'd be fair to assume that FB@2 (con2) has the wrong characteristics for your needs. We already know that it's got the correct type (00040000) so that leaves 2 x things to play with: it's own id (Index + Bus id) or pipe. Normally, you never have to modify the flags. I'd replace the connector's id from 0204 to 0306 using the index + busid properties. So, try to inject those properties under PciRoot(0x0)/Pci(0x2,0x0): framebuffer-con1-enable 1 NUMBER framebuffer-con1-type 00080000 DATA framebuffer-con2-enable 1 NUMBER framebuffer-con2-index 3 NUMBER framebuffer-con2-busid 6 NUMBER Link to comment Share on other sites More sharing options...
mefflecakes Posted November 21, 2020 Author Share Posted November 21, 2020 Not sure why my reply didnt save, but the good news is that I can now get 1440p out of the HDMI port, whereas before it was only 1080p - the bad news is that DPort still isnt working (tried them both). Do you want me to provided updated files or no need? Thanks for your help! Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 21, 2020 Moderators Share Posted November 21, 2020 This is what I have on my 7040 with HD530. DP ports works perfectly with 1440p, don't have 4k to test. Keep an untouched bootable USB handy if these change won't work for you. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 21, 2020 Administrators Share Posted November 21, 2020 @mefflecakes, beyond the suggestions above, all I can offer is that you experiment with what I suggested in that post at IM and that I linked in my last post on the previous page. Link to comment Share on other sites More sharing options...
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