Server 20.04 - sane is not responding

[David Fletcher]

On Sun, 2020-05-24 at 14:13 +0200, Oliver Grawert wrote:
> hi,
> Am Sonntag, den 24.05.2020, 12:31 +0100 schrieb David Fletcher:
> > 
> > 
> > administrator at ServerIV:~$ sudo sane-find-scanner
> >   # sane-find-scanner will now attempt to detect your scanner. If
> > the
> > found USB scanner (vendor=0x04b8 [EPSON], product=0x0112 [EPSON
> > Scanner]) at libusb:001:008
> > found USB scanner (vendor=0x1a86, product=0x7523 [USB2.0-Serial])
> > at
> > libusb:001:010
> >   # Your USB scanner was (probably) detected. It may or may not be
> > supported by
> >   # SANE. Try scanimage -L and read the backend's manpage.
> > administrator at ServerIV:~$ 
> this is good, so your kernel and libusb know the scanner ...
> 
> 
> > 
> > administrator at ServerIV:~$ ls /lib/udev/rules.d
> > No mentions of Epson or scanner
> > 
> rather try:
> 
> $ grep 04b8 /lib/udev/rules.d/*
That produces:-
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0112",
ENV{libsane_matched}="yes"

Exactly the contents you suggested below, so the system should already
know, yes? It's in
/lib/udev/rules.d/60-libsane.rules

# Epson Perfection 2450 | Epson GT-9700F | Epson Perfection 2450 PHOTO
ATTRS{type}=="3", ATTRS{vendor}=="EPSON", ATTRS{model}=="GT-9700",
ENV{libsane_matched}="yes"

Mine is the 2450 PHOTO



> "048d" is the vendor id of epson, if there are any epson related udev
> entries they should show up ...
> 
> to make the device known to libsane you should be able to create your
> own udev rule like (in one line, mind the 80 char email wrap ...):
> 
> 
> ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0112",
> ENV{libsane_matched}="yes"
> 
> name it something like:
> 
> /lib/udev/rules.d/40-libsane-epson.rules
> 
> groups and such should play a less important rule in ubuntu.
> USB devices mostly use udev-acl for permissions anyway. anything
> accessing usb devices via libusb (which libsane should do) should get
> access ...

That's the impression I get from doing some reading....

Doing some poking around I found in /usr/lib/udev/hwdb.d/20-sane.hwdb

# Epson Perfection 2450 | Epson GT-9700F | Epson Perfection 2450 PHOTO
usb:v04B8p0112*
 libsane_matched=yes

which apparently is what 60-libsane.rules is derived from.

So AFAICT everything appears to be in order but it doesn't want to
work.

Thanks Oliver for staying with me on this.