Re: annoying frequent overcurrent messages.

[Dave Jones]

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

-- 
http://www.codemonkey.org.uk
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