Latitude E6500 El Capitan no sound

[Jake Lo]

I don't have this issue on my Latitudes with IDT audio, only ALC (Realtek). 

You'll need to patch your DSDT to layout-id=12 (hex=0C)

[Pupilliam]

Are there any advantages to using patched AppleHDA instead of VoodooHDA? I've gotten Voodoo to work now.

[Hervé]

HDMI audio if you have HDMI.

[Pupilliam]

Ha, I've got a DisplayPort, but I never use it. Thank you for all of the help!

[Pupilliam]

I don't have this issue on my Latitudes with IDT audio, only ALC (Realtek). 

You'll need to patch your DSDT to layout-id=12 (hex=0C)

How exactly do I go about that? I'm trying to get the patched AppleHDA running so I don't have my processor stuck at 1.6 Ghz

[Hervé]

?
 
What relation would there be between patching AppleHDA and a CPU stuck at 1.6GHz?
 
For maximised CPU power management performance, make sure to:
1) enable all cores and SpeedStep in BIOS
2) for C2D and 1st gen Arrandale Core CPU, enable/activate C States & P States generation
3) A fine-tuned FakeSMC (SMC keys) often help for vanilla SpeedStepping + AGPM too
 
To inject a specific audio layout-id, patch your DSDT according to the following examples:

Device (HDEF)
{
    Name (_ADR, 0x001B0000)

    [...]

    Method (_DSM, 4, NotSerialized)
    {
        [...]

        Return (Package (0x--)
        {
            [...]

            "layout-id",
            Buffer (0x04)
            {
                0x0C, 0x00, 0x00, 0x00
            },

            [...]
         })
    }
}

or

Device (HDEF)
{
    Name (_ADR, 0x001B0000)

    [...]

    Method (_DSM, 4, NotSerialized)
    {
        [...]

        Store(Package (0x--)
        {
            [...]

            "layout-id",
            Buffer (0x04)
            {
                0x0C, 0x00, 0x00, 0x00
            },

            [...]
         }, Local0)
         DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
         Return (Local0)
    }
}

`

There are many examples scrounging this forum and the Net, you'll easily find some. Here, for instance.