[sane-devel] Epson Perfection 2400 - conks out on desktop machine but works on laptop

[Phil Reynolds]

On Wed, May 07, 2008 at 09:39:25AM +0900, Olaf Meeuwissen wrote:
> Phil Reynolds <phil-sane at tinsleyviaduct.com> writes:
> Looks like that "meta"info never got to the backend, for whatever
> reason.  This is most likely a timing and/or a hardware problem.
> 
> > [epson] scan_finish()
> > [epson] send buf, size = 2
> > [epson] buf[0] 1b .
> > [epson] buf[1] 66 f
> > [epson] w_cmd_count = 45
> > [epson] r_cmd_count = 3804
> > [epson] send buf, size = 2
> > [epson] buf[0] 1b .
> > [epson] buf[1] 66 f
> > [epson] w_cmd_count = 46
> > [epson] r_cmd_count = 3804
> > [epson] w_cmd_count = 46
> > [epson] r_cmd_count = 3804
> > [epson] receive buf, expected = 4, got = 0
> 
> Ditto here.  The expected reply is not making its way to the backend.
> 
> > [snip]
> > The preview stopped about 14 cm down the image area.
> 
> Have you experienced other problems your desktop's USB port when using
> large amounts of data?  Something like not being able to reliably copy
> large files to/from a USB stick for example.

I have had occasional failures with accessing hard disks over the USB,
but I couldn't be sure the disks were supposed to be good. I may now
have to retest the ones I've put for scrapping.

> The fact that things work okay on your laptop (and assuming that you
> use the same version of the same backend there) seem to point the
> finger to your desktop's USB hardware (or the kernel support for it).

I use the same version I was trying to use... I backported a newer one
to my desktop in an attempt to see what was going on.

I added a USB card from my spares, and the scanner works on that -
within limits but then again it always did. It looks very like a
motherboard fault.

-- 
Phil Reynolds
 o  ____ mail: phil-sane at tinsleyviaduct.com
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