[coreboot] T430 fan control

[Davíð Steinn Geirsson]

Nevermind the below. It turns out the fan on this test machine was just
faulty. I replaced it with a spare from my other T430 and everything works
fine now!

Sorry for the spam.

Best regards,
Davíð

On Fri, Dec 22, 2017 at 10:57:57AM +0000, Davíð Steinn Geirsson wrote:
> Hi all,
> 
> I'm trying to get coreboot working on a Lenovo T430. Build and flash were
> successful, however it seems the fan control does not work for me.
> 
> The fan spins but at a low speed, and does not increase even if I run
> a stresstest like 'stress --cpu 4'. Watching 'sensors' output I can see
> temperatures increase past the high point, towards the critical point and
> after a couple of minutes the machine shuts down due to a thermal event.
> 
> In the 'sensors' output the fan status is stuck at 65535RPM, but I'm not sure
> if that would have been correct on the manufacturers BIOS since I never
> tested it.
> 
> Anyone have any ideas? Or maybe some insight into how the fan control stuff
> works on these machines (I thought the EC took care of all that stuff without
> OS/BIOS intervention)?
> 
> I am running from git master checked out Dec 21 (latest commit I see in my tree is ceeafa45cae26ab857687082e02eae40d9621291).
> 
> Best regards,
> Davíð
> 
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