Thebes Knossos Posted July 31, 2025 Share Posted July 31, 2025 Opencore 1.05 installed on i3-9100 UHD 630, I need help just a presentation here before posting in relevant section. All is working fine except Dual screen. Multi booting Windows, Linux and Opencore (Monterey, Ventura and Monterey at the moment) Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/ Share on other sites More sharing options...
Thebes Knossos Posted July 31, 2025 Author Share Posted July 31, 2025 (edited) 2 hours ago, verdazil said: ct both monitors to a discrete graphics card. All is working under Windows and Linux. Is here a specific section for this subject ? Edited July 31, 2025 by Thebes Knossos Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838200 Share on other sites More sharing options...
Thebes Knossos Posted August 1, 2025 Author Share Posted August 1, 2025 I can't post in right section: https://www.insanelymac.com/forum/175-intel/ Why? Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838260 Share on other sites More sharing options...
Cyberdevs Posted August 1, 2025 Share Posted August 1, 2025 @Thebes Knossos Read this topic, that's why: Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838265 Share on other sites More sharing options...
Thebes Knossos Posted August 1, 2025 Author Share Posted August 1, 2025 OK tanks for the rules. I have post original here https://github.com/dortania/bugtracker/issues/366 , but there are no active responses actually. I can discuss more here I think. Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838268 Share on other sites More sharing options...
Cyberdevs Posted August 1, 2025 Share Posted August 1, 2025 Yes you can post here until you reach enough valid posts to join the members group Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838269 Share on other sites More sharing options...
Thebes Knossos Posted August 1, 2025 Author Share Posted August 1, 2025 Ok, copy - paste then Problem with dual screens : Opencore 1.0.5 used with latests .kext on H310M Sp2 V2 motherboard. Monitor 1: Samsung S24C350 1920x1080 connected to Hdmi, detected at framebuffer 2, Monitor 2: IISonic 1280*1024 connected to VGA and detected at frambuffer 0. Each monitor connected individually: everything goes well. Hotplugging monitors both works too. The problem: cold start. The phase with the progress bar displays correctly, then displays correctly on the VGA and when the HDMI monitor wants to display the desktop I have flickering with horizontal black bars on both monitors. I don't know how to debug this, I have try to force Port types like written here : https://github.com/dortania/OpenCore-Post-Install/blob/master/gpu-patching/intel-patching/connector.md without succes. With -igfxdump I get only at end : 2025-07-31 10:08:23.758076+0200 0x918 Default 0x0 0 0 kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][PLANE ] [Flip_Transaction] Pipe Gamma Enable 2025-07-31 10:08:24.027975+0200 0x929 Default 0x0 0 0 kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][TRANSACTION] [Flip_Transaction] FB2: Flipping display with wsaa 1 flipped from 1920 x 1080 -> 1920 x 1080 on 45fb9000 with 1 options at stride 7680 2025-07-31 10:29:34.862951+0200 0x918 Default 0x0 0 0 kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][TRANSACTION] [Flip_Transaction] FB0: Flipping display with wsaa 1 flipped from 1280 x 1024 -> 1280 x 1024 on 448d0000 with 1 options at stride 5120 My AAPL,ig-platform-id is detected as <07 00 9b 3e> device-id <91 3e 00 00> . iMac19,1 emulated , Coffe Lake i3-9100 Cpu Uhd630, desktop. Same problem under Monterey, Ventura, Sonoma, but no problem with Linux or Windows on same machine How to debug more ? Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838273 Share on other sites More sharing options...
Thebes Knossos Posted August 3, 2025 Author Share Posted August 3, 2025 This is exactly what I have at cold boot : Quote Link to comment https://www.insanelymac.com/forum/topic/361445-just-registered-today-i-have-problem-with-dual-screen/#findComment-2838335 Share on other sites More sharing options...
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