On Sat, 20 Jan 2007, Prakash Punnoor wrote:

> Am Freitag 19 Januar 2007 17:11 schrieb Alan Stern:
> > [Removed LKML from the CC: list]
> >
> > On Fri, 19 Jan 2007, Prakash Punnoor wrote:
> > > Hi,
> > >
> > > I found quickly booted into a 2.6.19-rc5 kjernel which was lying around
> > > here and here CONFIG_USB_SUSPEND doesn't make any problems with my
> > > scanner...
> >
> > At the moment it would help more to see the dmesg log for your 2.6.19-rc5
> > kernel, showing the boot-up and what happens when you use the scanner.
> 
> Here are both. What is interesting, when I enable the debug output, it is 
> much 
> harder to reproduce it. In the 2.6.20-rc kernel I tried it first with debug 
> enabled, than disabled (and quickly reproduced it) then enabled again and at 
> last one time sane-find-scanner returned nothing. At next try it found the 
> scanner again...

I didn't see anything that would indicate a reason for the change in
behavior.  If you used 2.6.19-rc5 with debug disabled then you might also 
reproduce the problem quickly.  Maybe.

The log shows that the scanner is plugged into a hub.  What happens if you 
plug the scanner directly into the computer instead?  I'm thinking that 
maybe the problem is caused by the hub, not by the scanner.

It could be a timing issue.  Maybe the hub needs just a little more time 
to finish carrying out its resume.  But turning on debugging doesn't add 
all that big a delay...

Alan Stern


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