[solved] Display port not working in GA Z270 Gaming K5 with i7 7700k

[hotsun]

My Specs:
i7 7700k
GA Z270 Gaming K5
DDR4 2400 16G*2
OCZ Agility 120 SSD (sata), 3TB HDD (sata)
BCM94360CS bluetooth and wifi card (from taobao, it just plugs and works perfectly after a fresh installation)
Philips 1080p monitor (using onboard HDMI)
LG 4k monitor (using onboard DisplayPort)

currently either HDMI or DP works. Can't use dual monitor.

any comment would be appricated!

Sunnys-iMac:~ sunny$ kextstat|grep -y acpiplat
   13    1 0xffffff7f829ee000 0x60000    0x60000    com.apple.driver.AppleACPIPlatform (5.0) 65E05472-6AE7-3308-8CC8-FA6CB0DB2AEE <12 11 7 6 5 4 3 1>
Sunnys-iMac:~ sunny$ kextstat|grep -y appleintelcpu
Sunnys-iMac:~ sunny$ kextstat|grep -y applelpc
Sunnys-iMac:~ sunny$ kextstat|grep -y applehda
   91    1 0xffffff7f82e06000 0x1b000    0x1b000    com.apple.driver.AppleHDAController (279.48) ED51F180-19C8-3DE1-AF81-0E389D98ADDE <90 89 82 12 7 6 5 4 3 1>
   97    0 0xffffff7f82f96000 0xb5000    0xb5000    com.apple.driver.AppleHDA (279.48) 806B8C17-50CA-3C6B-90B3-195F38D8FB89 <96 93 91 90 89 82 6 5 4 3 1>
Sunnys-iMac:~ sunny$ sudo touch /System/Library/Extensions && sudo kextcache -u /
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext FakeSMC.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext XHCI-200-series-injector.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext USBInjectAll.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext Lilu.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext FakePCIID_Intel_HD_Graphics.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext FakePCIID.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext PinConfigs.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext AppleALC.kext
KernelCache ID: FF6F1CEB8240A157CA0BBA8CDA02A3A7

 

[hotsun]

I found there is only either HDMI or display port works, updated post for debug msg

 

[hotsun]

for attached EFI, I can only see 3 frame buffers from IO registry Explorer.
trying to open 4 but always failed.
This patch can show 4 frame buffers but when I boot with DP, and plug in HDMI, no signal in DP...

            <dict>
                <key>Comment</key>
                <string>10.11-SKL530-Port_0-DP2HDMI</string>
                <key>Find</key>
                <data>
                /wAAAAEAAABAAAAA
                </data>
                <key>Name</key>
                <string>AppleIntelSKLGraphicsFramebuffer</string>
                <key>Replace</key>
                <data>
                AAAIAAAIAACCAAAA
                </data>
            </dict>

not sure where I did wrong

 

[hotsun]

just want to mark this as solved. As tested, the following patch works for 1 monitor during boot, and hot plug for the other one. I must turn off one of the monitor to enter OS first, otherwise it will stuck in login screen.

            <dict>
                <key>Comment</key>
                <string>10.11.4+-SKL-1912000-4_displays</string>
                <key>Disabled</key>
                <false/>
                <key>Find</key>
                <data>
                AQMDAw==
                </data>
                <key>Name</key>
                <string>AppleIntelSKLGraphicsFramebuffer</string>
                <key>Replace</key>
                <data>
                AQMEAw==
                </data>
            </dict>
            <dict>
                <key>Comment</key>
                <string>10.11.4-SKL-1912000-Port_0x5-DP2HDM</string>
                <key>Disabled</key>
                <false/>
                <key>Find</key>
                <data>
                AQUJAAAEAACHAQAA
                </data>
                <key>Name</key>
                <string>AppleIntelSKLGraphicsFramebuffer</string>
                <key>Replace</key>
                <data>
                AQUJAAAIAACHAQAA
                </data>
            </dict>
            <dict>
                <key>Comment</key>
                <string>10.11.4-SKL-1912000-Port_0x6-DP2HDM</string>
                <key>Disabled</key>
                <false/>
                <key>Find</key>
                <data>
                AgQKAAAEAACHAQAA
                </data>
                <key>Name</key>
                <string>AppleIntelSKLGraphicsFramebuffer</string>
                <key>Replace</key>
                <data>
                AgQKAAAIAACHAQAA
                </data>
            </dict>
            <dict>
                <key>Comment</key>
                <string>10.11.4-SKL-1912000-Port_0x7-DP2HDM</string>
                <key>Disabled</key>
                <false/>
                <key>Find</key>
                <data>
                AwYKAAAEAACHAQAA
                </data>
                <key>Name</key>
                <string>AppleIntelSKLGraphicsFramebuffer</string>
                <key>Replace</key>
                <data>
                AwYKAAAIAACHAQAA
                </data>
            </dict>