Jake Lo

Replace AppleHDA_alc255 if you're installing El Capitan 10.11.4. Replace the DSDT/SSDT with this one. I messed up on the layout-id. It's correct now. 3148.zip

Upload your DSDT/Config and patched AppleHDA_xxx

Can you remove the "layout-id" and see if it still works? It's left out on my E7x40 and E7450 systems and HDMI audio still works.

Is there a bootpack you're using? or you're creating your own? Which version of El Capitan are you installing? there's a known issue with Voodoops2Controller on 10.11.4 and needs a specific version to work. See my Clover guide for some hints.

Will you be installing El Capitan? Here are files for Yosemite. Replace your config.plist and Other folder with this. Make a backup first. Place the 2 DSDT/SSDT in /EFI/Clover/ACPI/Patched Install kexts in /EFI/Clover/Kexts/Other/SLE to /System/Library/Extensions with kextwizard or just copy them there. Run this to repair permission and recreate cache sudo chmod -Rf 755 /S*/L*/E* sudo chown -Rf 0:0 /S*/L*/E* sudo touch -f /S*/L*/E* sudo kextcache -Boot -U / kingxsmoothy.zip

can you also run this and save the file including dcpimanager PCI List, upload both

Boot to Clover GUI. Hit F4, this will extract the raw files to /EFI/Clover/ACPI/Origin. I'm assuming you don't have any patched DSDT/SSDT at the moment. Compress the Origin folder and upload it here. I'll try to patch them for you. Once you're in the Desktop, download DPCIManager.app. You should be able to get the device info under PCI List. The config you have does have the audio patches, but you'll need the DSDT and the patched dummyHDA to work.

Make sure layout-id in DSDT is set to 1.

What SD card reader does it have? Yes, update to 10.11.4 is fine. Check the Update section for the newer AppleHDA_ALC283 before or after update to fix the sound. By the way, is HDMI audio working?

Go here, download and place both BrcmFirmwareRepo.kext and BrcmPatchRAM2.kext in /L/E and repair permission and rebuild cache

Does it show up under USB or Bluetooth in system info? What's it show as the Vend/Prod ID?

Hmm, FB was patched for HDMI video, has nothing to do with audio. Strange.. Have you restore the FB to see if audio is working again?

do you have SSDT generated for your CPU? have you tried changing hibernatemode to 0? when you close LID to sleep, does the power button blink or solid?

which guide / bootpack did you follow to build your M4800? You might be missing some audio patches on your Config.plist

Sorry, you probably need to update the compiler too. Place this in /usr/bin. Here's the patched DSDT with DW1550 added. Make sure to add the Config patch too for Airport Extreme. DSDT-dw1550.aml.zip

Use this version, set compiler to ACPI 6.1

@Platinum_one Patch your DSDT with this using MacIASL #wifi_DW1550-RP04-PXSX.txt into device label PXSX parent_label RP04 insert begin Method (_DSM, 4, NotSerialized)\n {\n If (LEqual (Arg2, Zero)) { Return (Buffer() { 0x03 } ) }\n Return (Package()\n {\n "device-id", Buffer() { 0xa0, 0x43, 0x00, 0x00 },\n "vendor-id", Buffer() { 0xe4, 0x14, 0x00, 0x00 },\n "name", "pci14e4,43a0",\n "subsystem-vendor-id", Buffer() { 0x28, 0x10, 0x00, 0x00 },\n "subsystem-id", Buffer() { 0x17, 0x00, 0x00, 0x00 },\n "compatible", "pci14e4,43a0",\n "IOName", "pci14e4,43a0"\n })\n }\n end; To change 3rd Party Wireless Device to Airport Extreme, add this to Config.plist under kextToPatch <dict> <key>Comment</key> <string>Airport Extreme (10.11)</string> <key>Find</key> <data> axAAAHUN </data> <key>Name</key> <string>AirPortBrcm4360</string> <key>Replace</key> <data> axAAAJCQ </data> </dict>

do you still have the vanilla AppleHDA in /S/L/E? Was cache successfully build?

No, you need the update kexts for 10.11.4 (ApplHDA_ALC255) found in the Update section in post #4 of the guide you're following Just follow the guide. Place the kext in /L/E and repair permission and rebuild cache No, there's no AppleHDA in Clover, only in /S/L/E and it needs to be there

Check the Update section in post#4 for the new ALC255

download IORegistryExplorer. Launch it, click on file and save. Attach file here with your DSDT.

What do you mean? Cache is completed successfully. Win8.1 should be able to install to UEFI mode, how did you make the boot disk? The build-in wifi is not support as stated by Hervé. Did you switch it to something else? Audio should also work, please send me your Config, DSDT and IOReg (use ioRegistryExplorer)

Either will work, but in /L/E, it's cleaner, keeping /S/L/E vanilla.

Stick with UEFI

audio is not working? did it work before replacing the FB?