unreliable USB connections

Arne Goetje arne.goetje at canonical.com
Mon Jan 25 01:13:33 GMT 2010

Mackenzie Morgan wrote:
> On Sun, Jan 24, 2010 at 2:58 AM, Andy Rabagliati <andyr at wizzy.com> wrote:
>> On Fri, 22 Jan 2010, Stefan Bader wrote:
>>> Jonathan Riddell wrote:
>>>> I'm getting reports of USB devices not reliably being recognised when
>>>> plugged in by the system in Karmic.  Has anyone seen this?
>>>> Jonathan
>>> I think I've seen one or two bug reports (though not got around to get to them
>>> debugged). Never seen something like this on machines I could lay my hands on.
>> I often suspect power issues for USB drives that have no separate power connection.
> The case Jonathan is not specific to USB drives.  It's USB in general.
>  One person reported that they need to unplug/replug their keyboard
> 6-10 times before it is recognized.

I have experienced this recently with my Epson scanner on Karmic with
-updates. The device got detected and showed up in lsusb, but the
computer couldn't talk to it, it always failed with IO Error. After
power cycling the scanner multiple times, it worked again. This has just
happened recently, before I was able to use the same scanner on Karmic
without problems.


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