hello, need some help here. i got 2 2015 retina macbook pros from an ewaste bin last week, both with the dual iris pro / radeon r9 gpu and 16gb ram. i installed MacOS Sequoia on it using OCLP, now im having a problem.
Specifically with audio, i have no bass, ZERO AT ALL. in settings and audio midi settings it shows only a 2 channel high output, no subs. thing is i know the subs work because i installed the default supported macos on the other laptop and it has bass, and then when i put sequoia on it i encountered the same issue. i had also ran the last supported macos on this macbook too and it had bass. its pointing at a firmware or driver issue.
problem is, i have tried EVERYTHING, ive tried all known fixes and nothing has worked, ive tried post root patches several times but it doesnt show any audio patches. and ive also tried the following:
NVRAM Reset
killall coreaudiod
VoodooHDA
Direct Driver injection from a supported os.
EFI Config Plist DeviceProperties Change
CorePKG Driver injection
Boot arguements
Layout ID Spoof
ALC Injection
NOTHING has worked, still no bass or 4ch output detected.
im at a loss here, i cant think of any other way to fix this, i had the same problem in ventura aswell so my only option is to downgrade to Big Sur which i really dont want to do. i also like desktop widgets and the new lock screen on Sequoia which is why i would ideally want to keep it on sequoia.
If you have anymore ideas, please feel free to help. i need it. thank you!
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