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E6420 (nVidia): keeping Optimus enabled in BIOS


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Hi Hervé,

I did a fresh install of High Sierra following Jake's guide and using the correct bootpack for Optimus configuration. Now the system boots with video only when I enable Optimus is the BIOS. When I restart or shutdown somehow Optimus is disabled in the BIOS and I have to enable it again in order to boot with video. Also, when in sleep mode, when I press the power button to wake the laptop it directly shuts down. Besides those issues everything else seems to work fine. I know that DSDT is unique for each system, that's why I have extracted my original tables (F4 in Clover). I am attaching my current config.plist, original tables and current DSDT file. I'd greatly appreciate it if you could help me patch my DSDT. Thank you in advance.


Dell Latitude E6420


Intel HD3000 + NVIDIA NVS4200M

Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz


Best regards.


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Try this, replace config and DSDT/SSDT into /EFI/Clover/ACPI/Patched

First try DSDT.aml with the SSDT-xx, then try DSDT-slice.aml (rename it to DSDT.aml when use) with the same SSDT-xx.aml


Note: DSDT uses EmlyDinesh's method for disabling Nvidia

          DSDT-slice uses Slice's method linked by Bronxtech




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