hdmi port not working

[Mike HW]

Hi,

 

I have a mostly working system - all except I have only one monitor, or more acurately, at the end of boot the HDMI port gets disabled. The DisplayPort works fine. In fact it looks great and I would be happy with it but it kills me that to use two monitors I have to boot into Linux.

 

I have spent a lot of time trying solve this. I followed the documentation, and generaly tried just about everything before coming here so you have my apologies :-)

 

My system is as follows;

 

00:00.0 Host bridge: Intel Corporation 8th Gen Core 8-core Desktop Processor Host Bridge/DRAM Registers [Coffee Lake S] (rev 0d)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop 9 Series) (rev 02)
00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller (rev 10)
00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)
00:16.0 Communication controller: Intel Corporation Cannon Lake PCH HECI Controller (rev 10)
00:17.0 SATA controller: Intel Corporation Cannon Lake PCH SATA AHCI Controller (rev 10)
00:1b.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #17 (rev f0)
00:1c.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #1 (rev f0)
00:1c.6 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #7 (rev f0)
00:1d.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #9 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Z390 Chipset LPC/eSPI Controller (rev 10)
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI Controller (rev 10)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-V (rev 10)
03:00.0 Network controller: Intel Corporation Wireless-AC 9260 (rev 29)
04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983

 

My config.plist as attached - and the config matches file locations.

 

Note In the DeviceProperties section I did add some config as in the guide and tried a lot of variations,  but they didn't work. They tended to give me my maximum resolution and half of that. I found if I didn't add the config the guide told me too I get the monitor on the DisplayPort working perfectly with all available resolutions which are needed because the maximimum is ridiculous.

 

Surely there's somthing obvious that more experienced people would spot instantly :-)

 

Any help would be much appreciated.

 

 

config.plist

Edited October 10, 2020 by Mike HW
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[Allan]

Hello and welcome to InsanelyMac.

 

Give your hardware specs when necessary (asking for support) and any other time where it may be beneficial to have them listed. Watch this video to guide you how to do that: [Video] How to add a signature.