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E6540: Can discrete graphics card be disabled?


z1326

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I've got a Latitude E6540 with Intel HD4600 + AMD 8790M graphics and I've been trying to disable the AMD 8790M. I've tried for about 2 weeks and once I disable it, the OS X will get high fan speed and auto shut down. So please take a look at it.

 

origin.zip

 

This is the zip file of original DSDT and SSDTs extracted from clover---F4 key.

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In SSDT-8:

    Scope (\_SB.PCI0.PEG0.PEGP)
    {
       [...]
       [...]
       [...]
       Method (_INI, 0, NotSerialized)
        {
            Store (Zero, \_SB.PCI0.PEG0.PEGP._ADR)
        }

`

In SSDT-9:

   Scope (\_SB.PCI0.PEG0.PEGP)
    {
        Method (_ON, 0, Serialized)
        {
            SGON ()
            Notify (\_SB.PCI0.PEG0, Zero)
        }


        Method (_OFF, 0, Serialized)
        {
            SGOF ()
            Notify (\_SB.PCI0.PEG0, Zero)
        }
`
Patch SSDT-8 to turn off your dGPU:
1) add the following line at the top
External (_OFF, MethodObj)

2) add the _OFF method to the _INI method of the PEGP scope, under the Store command

_OFF()

`

Do this to the .dsl decompiled table (decompiled with MacIASL so that it may correct some of the erroneous code; it's quite typical), then recompile the revised SSDT-8 table and place it in the ACPI/patched folder.

 

Be aware that you'll probably not see much difference in terms of heat (the dGPU is never used) or battery gain.

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Your files all appear corrupt so that may explain the resulting behaviour...

 

I've patched your raw DSDT + SSDT-8 tables. Try the attached patched tables and let us know. Saved them (without the "_patched" string in the file names) to your EFI/ACPI/Patched folder. If you have already patched DSDT and/or SSDT, keep a backup somewhere.

DSDT_patched.aml.zip SSDT-8_patched.zip

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A16 bios. And I think I've trimmed the clover config.plist as simple as I can.
Could you upload your config.plist? I'll try them next week (I am traveling outside now and l didn't bring the laptop with me.)

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