G5 Quad Fans full speed after 1 min

[Michael Tuexen]

> On 19. Jan 2020, at 09:38, Francis Little <oggy at farscape.co.uk> wrote:
> 
> Hi,
> 
> My G5 Quad is running current from a few days ago, but this issue has been
> happening for a long time.
> 
> After about 1 min of uptime, the fans go full speed.
> 
> As soon as I query anything like CPU temp or fan rpm with sysctl, the fans
> return to a normal speed.
> 
> 1 min later the fans go full speed again.
> 
> I've been working round this for some time with a cron job that runs sysctl
> with one of the cpu temp sensors to calm the system.
> 
> If I boot to OS X 10.5 and load the system, the fans are stable.
> 
> Does anyone else get this?
Yepp, this happens for a long time now. Disabling SMP works around it.
To disable SMP, put in /boot/loader.conf

kern.smp.disabled=1

Best regards
Michael
> 
> Regards
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