I have a Zephyrus G14 and have experienced these issues. Audio crackling, lots of stuttering when playing back video on the iGPU. Throttling has been less of an issue for me. I'm on Linux Mint, so the problems are definitely BIOS related and not OS-dependent. Stuttering continued even after I manually expanded the iGPU's available memory pool in the AMD kernel settings.
The laptop was a nice deal on fire sale, but I guess I get what I pay for.
I will just share my struggles with Asus Tuf A15 (FA507UI) bought in March 2024. It was really frustrating, and I spent so many hours debugging. Unfortunately I wasn't as skilled to decompile dsdt/acpi, but all these keywords look familiar from my deep dives into the issue.
In the beginning I had sticky keyboard issue, with a button repeatedly triggered for no reason. This got fixed after one of the bios updates.
Later, for a while I had the stuttering issue when the GPU was in standby (when loaded in hybrid mode) [1]. I then switched from PopOS to Manjaro with a hope that newer kernel might fix it, and it did.
Today I'm struggling with a new issue - GPU sometimes gets disconnected, and requires system reboot to turn it on again. I generally use GPU for compute, not for graphics - so you don't see it until you do. New Nvidia drivers might have fixed this [2].
[1] https://forums.developer.nvidia.com/t/random-freezes-rtx-407...
[2] https://forums.developer.nvidia.com/t/bug-sporadic-hang-on-s...