[sane-devel] Scanner Lide 220

[Johannes Meixner]

Hello Frank Kroschewski,

On Jul 18 18:21 Kelly Price wrote (excerpt):
> a USB 2.0 port on your motherboard won't work if it's using
> a USB 3.0+ chipset to handle it.

for general information about USB you may have a look at
the section "USB" in
https://en.opensuse.org/SDB:Configuring_Scanners

In general you may also have a look at the section
"Trouble-Shooting (Debugging)" in
https://en.opensuse.org/SDB:Configuring_Scanners

For more information about USB 2 versus USB 3 issues
and how to debug them you should have a look at

http://lists.alioth.debian.org/pipermail/sane-devel/2016-November/034901.html

and follow the links therein because nowadays "xhci_hcd"
kernel driver/module issues (a.k.a. "USB 3" issues) are the
most often cause of inexplicable problems with USB scanners
(in particular errors during lower level device I/O).

When you use current SANE-Backends version 1.0.27
see additionally
http://sane-project.org/
that reads (excerpt):
--------------------------------------------------------------------
Latest News

2017-05-22: SANE-Backends-1.0.27 (see Note 1) has been released:

...

Note 3: The Linux USB3 workaround which was added in version 1.0.25
is now disabled by default. If you have difficulty using a scanner
which previously worked, or intermittent scanner availability, try
setting the new environment variable SANE_USB_WORKAROUND=1
before starting your frontend. 
--------------------------------------------------------------------


Kind Regards
Johannes Meixner
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