How to Fix Cannot have audio output HP Probook 4540s

How to Fix Cannot have audio output HP Probook 4540s

This mini-guide provides a structural approach to troubleshoot and fix the issue.

Prerequisites

• Confirm your hardware specifications (CPU, GPU, Motherboard).
• Ensure you have a bootable recovery USB and backup your EFI.

Fix Steps

1. Boot with -v keepsyms=1 debug=0x100 to identify the exact kernel panic.
2. Validate your config.plist using ocvalidate.
3. Ensure your EFI matches the Dortania guide specifications for your CPU generation.

Verification

• Reboot and verify if the functionality is restored and stable under typical usage.

Original Question:

Hi. I have installed OpenCore 0.6.6 with OSX 10.15.7 follow Dortania's guide. Aida64 shown that my laptop's audio codec is IDT 92HD87B2/4, which has layout-id 12 in AppleALC Supported Codecs. But when I set boot arg to alcid=12 in ProperTree, nothing happened. Mac show no output device. I have retried with different layout-id like 13, 3 but nothing seem to work. Do you know how to fix this? Thank you. ​ Check with IORegistryExplorer submitted by /u/nts0311 [link] [comments]