Ubuntu :: SANE / HPLIP And F300 Hangs With Large Scan Areas

SANE + HPLIP 3.11.3a-1 + Tomato v1.28.8754 ND USB Std + Hp Deskjet F380 (F300 series) only works with small scan areas. This error is affecting SANE running on my tomato router, this affects all computers that try to use that scanner, regardless of platform, in fact, it affects scans originating from the router itself. I believe that it could also happen on ubuntu if I had the same configuration as the router, it seems to be an error that would happen on any platform with the same SANE/hplip settings and hardware (HP Deskjet F380). The problem is also related to DPIs, but I can't manage to get one full page with 75 DPI, which is the lowest possible. If I get a small area (around 1/4 of the full glass) it will scan at some times.

If I increase the DPI, it won't scan. I will get an Error during device I/O, even if I try to scan directly from scanimage. I would like to have the scanner function of my AiO printer working, at least to scan the full glass in low resolutions (<=150). I can't load previews as well. I thought it could be a memory problem, since it does scan small areas, but it is not, in fact, the memory usage doesn't increase much during the scan, I even created a 128MB swap partition in my flash drive (was afraid of doing so, since it would wear it quickly, will probably remove now), but it didn't change anything, it still doesn't scan with more than 55% of the router's memory (16MB) free and more than 97% of the swap memory free.

Here are my configuration files:
/opt/etc/sane.d/dll.conf

Code:
hpaio
/opt/etc/sane.d/saned.conf

Code:
192.168.0.0/24
/opt/etc/xinetd.d/saned

Code:
service saned
{
port = 6566
socket_type = stream
server = /opt/sbin/saned
protocol = tcp
user = root
group = root
wait = no
disable = no
}
/opt/etc/xinetd.conf

Code:
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Sample configuration file for xinetd
defaults
{
only_from = localhost 192.168.0.0/24
instances = 60
log_type = FILE /opt/var/xinetd.log
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
}
includedir /opt/etc/xinetd.d

Everything is configured properly, I got the dbus and cups installed since both are required for hplip to work properly. Here are some other files, that shows what happens:
sane-find-scanner

Code:
# sane-find-scanner will now attempt to detect your scanner. If the result is different from what you expected, first make sure your scanner is powered up and properly connected to your computer.

# No SCSI scanners found. If you expected something different, make sure that you have loaded a kernel SCSI driver for your SCSI adapter. Also you need support for SCSI Generic (sg) in your operating system. If using Linux, try "modprobe sg".

found USB scanner (vendor=0x03f0 [HP], product=0x5511 [Deskjet F300 series]) at libusb:001:006
# Your USB scanner was (probably) detected. It may or may not be supported by SANE. Try scanimage -L and read the backend's manpage. Not checking for parallel port scanners.

# Most Scanners connected to the parallel port or other proprietary ports can't be detected by this program.
scanimage -L

Code:
device `hpaio:/usb/Deskjet_F300_series?serial=CN6BSGK1M104KH' is a Hewlett-Packard Deskjet_F300_series all-in-one
hp-probe

Code:
root@white:/opt/bin# ./hp-probe -busb
warning: python-dbus not installed.
warning: hp-probe should not be run as root/superuser.

HP Linux Imaging and Printing System (ver. 0.0.0)
Printer Discovery Utility ver. 4.1

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.

Found 1 printer(s) on the 'usb' bus.
Done.
scanimage > test.jpg

Code:
scanimage: sane_start: Error during device I/O
saned -d5
[saned] process_request: waiting for request
saned doesn't report any error, but starts waiting for another request.