Comment 6 for bug 819709

Forget about the hpaio problem, after uncommenting hpaio in /etc/sane.d/dll.conf scanning with hp-scan --adf gives:

[henny@elite ~]$ hp-scan --adf

HP Linux Imaging and Printing System (ver. 3.11.7)
Scan Utility ver. 2.2

Copyright (c) 2001-9 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Using device: hpaio:/net/Officejet_6500_E710a-f?zc=HP867CC7

warning: No destinations specified. Adding 'file' destination by default.
Using device hpaio:/net/Officejet_6500_E710a-f?zc=HP867CC7
Opening connection to device...

Resolution: 300dpi
Mode: gray
Compression: JPEG
Scan area (mm):
  Top left (x,y): (0.000000mm, 0.000000mm)
  Bottom right (x,y): (215.900009mm, 297.010681mm)
  Width: 215.900009mm
  Height: 297.010681mm
Destination(s): file
Output file:
warning: File destination enabled with no output file specified.
Setting output format to PDF for ADF mode.
warning: Defaulting to '/home/henny/hpscan001.pdf'.

Warming up...

Page 1: Scanning...
error: SANE: Error during device I/O (code=9)
Closing device.