Dell Latitude 5290: screen resolution issue with USB-c output

[pulleyluke]

Sure thing, my entire EFI is found here also - https://github.com/lukeshondas/Dell-Latitude-5290-Opencore

config.plist.zip

[WhenMusicAttacks]

try -igfxmpc boot arg

[Jake Lo]

@pulleyluke

the link only has a zipped EFI shell with just the boot file, not the full EFI folder

[pulleyluke]

@Jake Lo Sorry, here is my EFI, had to strip it down a little due to the upload size limit on this website

@WhenMusicAttacks Tried that with no difference sadly.

EFI.zip

[Hervé]

'tempted to say it's a likely EDID issue but you opted to post screenshots of your IOREg rather the IOReg themselves as asked.

[pulleyluke]

Crap sorry @Hervé I was an idiot and didn't know you could export the IOReg 

Here are the files you wanted (Hopefully done correctly this time)

1440p monitor running at 1080p via dock.zip

1440p monitor via dock.zip

1440p via HDMI.zip

[Hervé]

Yes, that's what I was expecting.

 

Your graphics config looks spot on. If you inspect the screen's EDID information, you will notice that the reported data differs between HDMI output and USB-c Dock output:

HDMI:

<00 ff ff ff ff ff ff 00 05 e3 78 27 d7 00 00 00 09 1b 01 03 80 3c 22 78 2a a5 95 a6 56 50 a0 26 0d 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40 81 c0 01 01 01 01 56 5e 00 a0 a0 a0 29 50 30 20 35 00 55 50 21 00 00 1e 00 00 00 fd 00 32 4c 1e 63 1e 00 0a 20 20 20 20 20 20 00 00 00 fc 00 32 37 37 38 58 0a 20 20 20 20 20 20 20 00 00 00 ff 00 47 4a 4c 48 33 48 41 30 30 30 32 31 35 01 fc 02 03 1e f1 4b 10 1f 05 14 04 13 03 12 02 11 01 23 09 07 07 83 01 00 00 65 03 0c 00 10 00 02 3a 80 18 71 38 2d 40 58 2c 45 00 55 50 21 00 00 1e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 55 50 21 00 00 1e 8c 0a d0 8a 20 e0 2d 10 10 3e 96 00 55 50 21 00 00 18 8c 0a d0 90 20 40 31 20 0c 40 55 00 55 50 21 00 00 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6d>

 

Dock (both):

<00 ff ff ff ff ff ff 00 05 e3 90 27 64 1f 00 00 34 1c 01 04 a5 3c 22 78 3a 48 15 a7 56 52 9c 27 0f 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40 81 c0 01 01 01 01 56 5e 00 a0 a0 a0 29 50 30 20 35 00 55 50 21 00 00 1e 00 00 00 fd 00 32 4c 1e 63 1e 01 0a 20 20 20 20 20 20 00 00 00 fc 00 51 32 37 39 30 0a 20 20 20 20 20 20 20 00 00 00 ff 00 47 51 4d 4a 43 48 41 30 30 38 30 33 36 01 9a 02 03 1e f1 4b 01 03 05 14 04 13 1f 12 02 11 90 23 09 07 07 83 01 00 00 65 03 0c 00 10 00 02 3a 80 18 71 38 2d 40 58 2c 45 00 55 50 21 00 00 1e 01 1d 00 72 51 d0 1e 20 6e 28 55 00 55 50 21 00 00 1e 8c 0a d0 8a 20 e0 2d 10 10 3e 96 00 55 50 21 00 00 18 8c 0a d0 90 20 40 31 20 0c 40 55 00 55 50 21 00 00 18 f0 3c 00 d0 51 a0 35 50 60 88 3a 00 55 50 21 00 00 1c 00 00 00 00 00 00 00 77>

 

I would suggest you try and inject the HDMI EDID value as additional property in your graphics configuration. Target AAPL02,override-no-connect since this external screen should be 2nd display out of FB@2 and specify the EDID value as DATA type without any space between the bytes. Refer to the Whatevergreen user manual if need be. Can't remember if the AAPL0x unit digit must match the connector's number. You'll be able to check that out in IOReg after reboot (under FB@2->display->AppleDisplay). Can't be AAPL00 for sure as that would be your built-in screen.

 

You may also try to patch connector con2 to HDMI type as per connector con1 though I'm not convinced this will take effect and change anything.