[bisected]5.15: halt command shuts down system but leaves power on

Similarly, reboot shuts down system but doesn't boot again.

git bisect says "first bad commit: [2f617f4df8dfef68f175160d533f5820a368023e] drm/amdkfd: map SVM range with correct access permission".

The previous change to drivers/gpu/drm/amd/amdkfd/kfd_svm.c was at commit ff891a2e. I can "fix" the bug at Linux 15.2 bygit diff 2f617f4d ff891a2e | patch -p1: Hunk 2 fails but that's OK.

I have 3 AMD systems but only the laptop has the bug. It is an HP model 15-bw040AU, Product Id 1ZH49PA#ABG.