I also do get those negative, zero, high value temperatures reported by the EC. More of less random after boot or suspend/wake cycles. Mostly, if temperatures are reported, they are stuck until another suspend/wake cycle or reboot happens.
Consistently, APU reports error.
There’s also this thread.
@Matt_Hartley, I’ve opened up a service ticket and issues in SoftwareFirmwareIssues and EmbeddedController.
I’ve also checked with my work colleagues, which have either another Framework 13 AMD or two Framework 16. Although, my laptop is the oldest one with 1 1/2 year old. Last pre-order batch.
With the same EC versions, they do not have this issue. So, I’m kind of concerned that this might be a hardware issue.
The solution is to manually set fan speeds according to load, which is quite cumbersome.