https://bugzilla.kernel.org/show_bug.cgi?id=112491
--- Comment #18 from Alex Deucher alexdeucher@gmail.com --- (In reply to Dionisus Torimens from comment #17)
I think I've solved it. The kernel parameter
radeon.runpm=0
seems to work around the issue. The performance is degraded, but the temperatures mostly stay below 80°C. Generally the system appears to stay much cooler.
Is this a multi-GPU notebook? That option only affects Hybrid laptops with multiple GPUs.