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SubjectRe: annoying frequent overcurrent messages.
On Wed, Jul 12, 2006 at 10:19:39AM -0400, Alan Stern wrote:
> Dave Jones wrote:
>
> > I have a box that's having its dmesg flooded with..
> >
> > hub 1-0:1.0: over-current change on port 1
> > hub 1-0:1.0: over-current change on port 2
> > hub 1-0:1.0: over-current change on port 1
> > hub 1-0:1.0: over-current change on port 2
> ...
>
> > over and over again..
> > The thing is, this box doesn't even have any USB devices connected to it,
> > so there's absolutely nothing I can do to remedy this.
>
> Well, overcurrent is a potentially dangerous situation. That's why it
> gets reported with dev_err priority.
>
> Evidently it's a hardware fault. Perhaps the overcurrent-detect input
> lines are floating and constantly triggering as a result. It's not even
> clear that attaching a USB device would make the problem go away.
>
> Since you're not using the UHCI controller on that computer, you could
> simply rmmod uhci-hcd (or modify /etc/modprobe.conf to prevent it from
> being loaded in the first place). That would stop the constant interrupts
> and the syslog spamming.
>
> But as for fixing the underlying hardware problem, I don't think there's
> anything we can do.

we could at least rate-limit the messages.

Dave

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http://www.codemonkey.org.uk
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