linux-kernel - Re: annoying frequent overcurrent messages.

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Message-ID: <20060714204445.GC8731@ucw.cz>
Date:	Fri, 14 Jul 2006 20:44:46 +0000
From:	Pavel Machek <pavel@....cz>
To:	Al Boldi <a1426z@...ab.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: annoying frequent overcurrent messages.

On Thu 13-07-06 23:50:55, Al Boldi wrote:
> On Thu, 2006-07-13 at 14:08 +0200, Pavel Machek 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.
> > 
> > Well, I see overcurrents all the time while doing suspend/resume...
> > 
> > Why is it dangerous? USB should survive plugging something that
> > connects +5V and ground. It may turn your machine off, but that should
> > be it...?
> 
> I don't want to sound alarming here, but I just had a USBFlashStick fried by 
> a machine, while in suspend-to-ram running 2.6.17.

Well, I have one usb sticdk fried by regular use under linux (like --
5 minutes of regular use!) and another fried by my dad on windows. So
these beasts are crap.

> I am blaming hw, but does anybody know how I can get my data back?

Probably not easily. Specialized shop might desolder flash chip and
read it directly... or you may try swapping flash chip into
'not-yet-fried' stick...

-- 
Thanks for all the (sleeping) penguins.
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