https://bugzilla.kernel.org/show_bug.cgi?id=201539
--- Comment #22 from MasterCATZ (mastercatz@hotmail.com) ---
(In reply to Sean Birkholz from comment #19)
I've done a bit of digging and I've managed to get a proper hysteresis value to appear in a 5.1.14 kernel built from source.
I modified (kernel src)/drivers/gpu/drm/amd/powerplay/inc/pp_thermal.h and changed the values of -273150 to 90000. This corrects the hysteresis value but I'm still searching for where the critical temp value is actually set.
I think you hit the nail on the head
amdgpu-pci-0100 Adapter: PCI adapter vddgfx: +0.90 V fan1: N/A (min = 0 RPM, max = 0 RPM) edge: +50.0°C (crit = +104000.0°C, hyst = -273.1°C) power1: 11.03 W (cap = 208.00 W)