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Dell Latitude 7490: building OpenCore EFI for Big Sur


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check out Hervé's guide, he also mentioned that trackpoint and mouse keys are not working. You can use tab to drag or 2 fingers to right click.

There's really no good support to Alps I2C touchpad, only some basic movement.

The USB-C port should work with external display though ... usb-c to DP port, but not much support there for thunderbolt.

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Hmm I was thinking to replace the touchpad+buttons with combo from another model with same/similar size (5470, 7480 etc.). Is that even possible ? This is the only downside.

Although Karabiner is able to make the buttons and trackpad working but the touchpad got messy, may be we can work it out somehow if the trackpad could be excluded from the rules.

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I tried at first but the result was the same, couldn't get the buttons working. I am sure there's a way to fix it even through a couple of additional steps. If Karabiner can make it working easily so is the system. It's not a big deal in the end of the day but sometimes I catch my self pressing the buttons as I am still get use to my Latitude 5450 (this one has better compatibility, hands down).

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On 7/8/2021 at 7:59 PM, quynkk5 said:

Your EFI File here :D

- Dell E7490: https://1drv.ms/u/s!AmHnQsJK7vXsiVlpNkqGhbu5KGVm?e=7Ww8VV
- Dell 3390: https://1drv.ms/u/s!AmHnQsJK7vXsiVruqVVa474xCAdg?e=8L5iUg

All of them contain 7 SSDTs (EC, USBX, HPET, PMC, PLUG, PNLF), important kexts like AppleALC, Lilu, WEG, VoodooPS2/I2C, VirtualSMC... and patched UHD 620.

You can add more kext or SSDTs, modify config.plist to patch for enabling more feature like Sleep, Touchpad, Wifi/BT...

P/S: Reset NVRAM before booting!

 

Files are no longer available at posted kinks.

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Hello people,
thanks again for your great support.
Especially quynkk5 I have to thank. Without the hint about the image at Olarila, I would not have even started the attempt.

With things running so nicely, I hooked up a Dell WD15 USB Type-c docking station.
Except for the USB ports and the NIC, everything works.
Is there a possibility to get this to run as well?

 

Hervé has worked out a great tutorial for this constellation and of course Jake Lo, who has helped me out several times.

 

If so I will get a touchpad from the 7480 as a spare part and install it in the 7490. A DW1830 is also already on the way.

 

Stay healthy

 

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6 hours ago, lamatta17 said:

If so I will get a touchpad from the 7480 as a spare part and install it in the 7490. A DW1830 is also already on the way.

 

 

Not 100% sure but as I remember the touchpad in 7480 is the same alps l2c with no working touchpad buttons.

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Hello people,
Jazzoo motivated me with the statement that the same chips are installed in the touchpad of the 7480 and 7490 to do the following:

I copied the VoodooPS2Controller.kext from the EFI for the 7480 to the EFI 7490, did a nvram-reset and rebooted.
Result:
Nothing changed with the touchpad. Pointer very slow and all buttons without function.
But now the USB ports and the NIC in the WD15 work.

Now only TB is missing and maybe soon there will be a solution for the touchpad and their keys.

Thanks again to all who supported me.

 

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