[ltp] High Speed USB problems

Jeffrey L. Taylor linux-thinkpad@linux-thinkpad.org
Mon, 19 Jul 2010 14:33:46 -0500

Quoting U Kuehn <ukuehn@acm.org>:
> Hi,
> On 19.07.2010 18:36, Jeffrey L. Taylor wrote:
> > My system recently started endlessly spewing the follow error in
> > /var/log/messages:
> > 
> > Jul 17 16:44:01 odysseus kernel: [ 2445.088449] hub 1-0:1.0: unable to enumerate USB device on port 4
> > 
> > Googling, all I find is a kernel bug from several years ago.  "rmmod ehci-hcd"
> > stops the error messages and stops high speed USB devices like an external
> > hard disk from working.  The USB mouse and printer work.  But no hard disk for
> > backups is not a happy, long term solution.
> > 
> > OpenSuSE 11.3, IBM Thinkpad T41.
> > 
> > IIRC, the system was not updated nor any apparently relevant changes made at
> > or immediately before the error messages started.  I think the laptop was
> > sitting at home while I was running errands.
> > 
> Do you observe high speed usb also not working under windows (warning
> like "high speed usb device connected to low speed port" or something
> similar)? If so, it might be hardware-related.
> I had the a similar problem, also only from time to time. I read
> somewhere that it indicates a dying south-bridge :( In the end, I had
> the mainboard replaced because sound device vanished from the system and
> in the end, it could not access the hard disk anymore. By that time,
> luckily, the warranty was still valid...

Thank you for jogging my brain, I'll try booting into Windows when I am home
where all the USB devices are.