CPU fan spinning at full speed on MSI Z690-A boards

[miczyg1]

Dasharo version
v1.1.1 and earlier

Dasharo variant
Dasharo compatible with MSI PRO Z690-A boards

Affected component(s) or functionality
coreboot

Brief summary
CPU fan is spinning at full speed.

How reproducible
Always

How to reproduce

Steps to reproduce the behavior:

1. Flash Dasharo v1.1.1 o earlier
2. Boot Ubuntu 22.04
3. Use https://github.com/Fred78290/nct6687d to check the CPU fan RPM

Expected behavior
CPU fan RPM should be much less than 1000RPM with Noctua cooling

Actual behavior
FAn RPM is constantly over 1000RPM on with Noctua cooling. On MSI firmware it sometimes shows 0 RPM, then one has to apply some load on CPU e.g. with stress-ng, then it starts showing ~500 RPM when temperature is lows and close to CPU idling.

Screenshots
None

Additional context
None

Solutions you've tried
None

[miczyg1]

@c67871f2 thanks, I will compare that to what I have found out so far

[miczyg1]

@c67871f2 by the way, how did you figure it out?

[c67871f2]

@miczyg1 First change the fan speed and then diff ec register content

[miczyg1]

Dasharo/coreboot#404

[BeataZdunczyk]

Closing this issue as the changes have been merged. We are currently completing testing for the release, and further updates will be provided on testing issues #612 and #613.