I am following this link: https://osxlatitude.com/index.php?/topic/8506-dell-latitude-inspiron-el-capitan-clover-guide/
to install 10.11.4 on E6430, had same problem, no audio,KP unless CPUs=1. Tried the suggested VoodooPS2Controller.kext, didn't fix the problem. Finally tried ApplePS2Controller.kext, that fixed the problem.
I am still having audio problem. Copied AppleHDA_IDT.kext from the E6430.zip to /Library/Extensions, but it won't build:
bash-3.2# sudo kextcache -Boot -U /
rebuilding //System/Library/PrelinkedKernels/prelinkedkernel
IOKitWaitQuiet() timed out.
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext ApplePS2Mouse.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext ApplePS2Keyboard.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext AppleACPIPS2Nub.kext
kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext ApplePS2Controller.kext
kext-dev-mode allowing invalid signature -67030 0xFFFFFFFFFFFEFA2A for kext AppleHDA_IDT.kext
kxld[com.apple.driver.AppleHDA]: The following symbols are unresolved for this kext:
kxld[com.apple.driver.AppleHDA]: IOPCIDevice::metaClass
kxld[com.apple.driver.AppleHDA]: IOACPIPlatformDevice::metaClass
Link failed (error code 5).
Prelink failed for com.apple.driver.AppleHDA; omitting from prelinked kernel.
/System/Library/PrelinkedKernels/prelinkedkernel not cached.
Successfully updated disk0s4.
kextcache updated critical boot files, requesting launchd reboot
Maybe I had a wrong AppleHDA or AppleHDA_IDT? I got AppleHDA_IDT from e6430.zip, and there is a AppleHDA in /S/L/E:
ls -l /System/Library/Extensions/ | grep HDA
drwxr-xr-x@ 3 root wheel 102 27 Feb 01:42 AppleHDA.kext