G5 Quad Fans full speed after 1 min

[Jason Bacon]

On 2020-01-19 02:38, Francis Little 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?
>
> Regards
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Yes, the problem is intermittent with respect to boot-up.  If I reboot a 
few times, eventually the problem does not return and the system will be 
stable until the next reboot.

Hoping an upgrade to a 13 snapshot might solve it.

     JB

-- 
Earth is a beta site.