when you started in to the boot loader did you switch to open source drivers or proprietary because alot of sound cards like intel sound cards use proprietary software which manjaro doesnt no include by default in the open source drivers like ubuntu or linux mint i think because i ran into the same problem you did and selecting proprietary software in the boot loader seemed to solve the problem for me on my machine is im runing a HP ENVY x360 Convertible 15-dr1xxx and my laptop like yours has a simlar sound card
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