iichb0: I2C error

[Francis Little]

Hi, I get loud fans on my G5 after a few mins (running 13-CURRENT).

When the fans rev up, If you run something like:

sysctl -a | grep temp:

do they calm down?

On mine it does so I have it in my crontab every 60 secs at the moment!

Regards

On Sun, 4 Aug 2019 at 14:38, Jason Bacon <bacon4000 at gmail.com> wrote:

> On 2019-07-14 20:58, Jason Bacon wrote:
> > On 2019-07-14 19:46, Justin Hibbits wrote:
> >> On Sat, Jul 13, 2019 at 9:32 AM Jason Bacon <bacon4000 at gmail.com>
> wrote:
> >>>
> >>> On my PowerMac G5, I consistently get this error after a cold boot:
> >>>
> >>> iichb0: I2C error
> >>>
> >>> After a minute or so, the fans ramp up to maximum.
> >>>
> >>> The error also consistently goes away after a warm reboot. Nothing more
> >>> in dmesg:
> >>>
> >>> FreeBSD powermacg5.acadix  bacon ~ 211: dmesg|grep iichb0
> >>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on
> >>> unin0
> >>> iicbus0: <OFW I2C bus> on iichb0
> >>> iichb0: I2C error
> >>> iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on
> >>> unin0
> >>> iicbus0: <OFW I2C bus> on iichb0
> >>>
> >>> No more runaway fans.
> >>>
> >>> Does this provide any clues about the cause?
> >> Hi Jason,
> >>
> >> How recently did this start occurring?  Would you be able to bisect
> >> the builds from a known-good starting point?
> >>
> >> Thanks.
> >>
> >> - Justin
> > I've never run a powerpc system until a few months ago, and this has
> > always been an issue on the PowerMac.  I just recently established the
> > pattern that it only happens after a cold boot, though.  I also have
> > an iMac G5 that does not exhibit this issue. Both are running
> > 12.0-RELEASE.  If you think it might help, I can try a 13 snapshot at
> > some point.
> >
> > Cheers,
> >
> >     JB
> >
> Cancel that pattern claim.  I've now seen it occur after a couple of
> warm boots as well.  If I keep rebooting the problem eventually stops.
>
> Always seems to follow I2C error in dmesg, though.
>
> Trying to mount root from ufs:/dev/ada0s3 [rw]...
> SMP: 2 CPUs found; 2 CPUs usable; 1 CPUs woken
> lo0: link state changed to UP
> gem0: link state changed to DOWN
> gem0: link state changed to UP
> Security policy loaded: MAC/ntpd (mac_ntpd)
> iichb0: I2C error
> FreeBSD powermacg5.acadix  bacon ~ 835:
>
> Fans go nuts after a few minutes.
>
> Reboot...
>
> Trying to mount root from ufs:/dev/ada0s3 [rw]...
> SMP: 2 CPUs found; 2 CPUs usable; 1 CPUs woken
> lo0: link state changed to UP
> gem0: link state changed to DOWN
> gem0: link state changed to UP
> Security policy loaded: MAC/ntpd (mac_ntpd)
> FreeBSD powermacg5.acadix  bacon ~ 835:
>
> No fan issues.
>
> --
> Earth is a beta site.
>
>
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