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[HELP] HP Probook 450 G1 - Intel HD 4600 - Intermittent and pitched HDMI Audio until enter and exit Sleep once

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Hello everyone. I already tried all the possible guides, but I am not able to have working HDMI Audio on Mojave, it is high pitched and messy, however after entering and exiting Sleep once it starts to work (until a reboot or disconnecting/reconnecting HDMI cable). Is there anyone that could help me? This laptop had HDMI audio working on Mavericks.

IOreg report and Efi folder attached.

MAKK’s MacBook Air.zip


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Edited by gmb

There are several items in your posted EFI that raise questions in relation to a Haswell/HD4600 platform. For instance:

  1. a CPU power management SSDT for an Ivy Bridge i3-31110M in the ACPI/patched folder; that will most definitely cause problems!
  2. a DSDT.dsl, i.e. the uncompiled source code, in the ACPI/patched folder
  3. a set of kexts limited to FakeSMC + VoodooPS2Controller in kexts/Other folder (with lots of other kexts, including AppleALC in kexts/off folder)
  4. many incorrect settings or settings that require substantial cleaning in your Clover config (eg: device properties injection for iGPU).
  5. the number and nature of on-the-fly patches is surprising. Those include active old/obsolete patches for AppleHDA. You would need to disable/delete those in order to rely solely on AppleALC-induced patches. Given that I saw no injector kexts for patched AppleHDA, I'm surprised you obtained working audio at all.

You'll have to fully explain how your Hack is actually setup. For instance, do you cache add-on kexts from /S/L/E and/or /L/E? I'm asking because, clearly, add-on kexts placed in kexts/Off are not used and I saw AppleALC (and many others) in there.

Yes, you are right, I noticed that too, I also know why that happend, long story... However I did reinstall everything and these attachement should be with everything correct. However the issue is still the same, until entering and exiting sleep the HDMI audio is not working.


I tried in 3 different Samsung TVs.

On the 1st: HDMI audio is pitched and intermittent until exiting sleep once

On the 2nd: HDMI audio is not working even if it's shown in the list of available audio devices

On the 3rd: HDMI audio appears briefly when unplugging and replugging the HDMI cable but then disappears from the list of available audio devices.


I also attached Library/Extensions folder screenshot


I had to remove FakePCIID HDMI Audio to have it work with the sleep workaround, if it is in clover/kext/others or Library/extensions, the HDMI Audio device doesn't appear in the list




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Edited by gmb

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