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m27315
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PostPosted: Fri Nov 20, 2015 5:50 pm    Post subject: [SOLVED] SANE client can no longer see my networked scanner Reply with quote

Previously, I was able to scan from my HP Photosmart 7520 over my network using SANE (XSANE), GIMP, and hplip. However, a few months ago, something got upgraded or changed, and now I can no longer scan. Whenever I use Gimp (File > Create > XSane: Device Dialog..), it comes back almost immediate after "scanning for devices", complaining:

Code:
no devices available


I have tried to follow this guide: https://wiki.gentoo.org/wiki/HPLIP.

And, everything seems to be fine.

How can I troubleshoot this? Has anybody else had this problem?

Thanks!


Last edited by m27315 on Tue Nov 24, 2015 6:17 pm; edited 2 times in total
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bbgermany
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PostPosted: Sun Nov 22, 2015 3:38 pm    Post subject: Reply with quote

Hi,

are you running saned via xinetd or as standalone service? I had a similiar issue as i was running it via xinetd. As soon as i switched back to standalone service, i was able to use my hp deskjet scanner/printer combination again.

greets, bb
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ian.au
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PostPosted: Sun Nov 22, 2015 5:16 pm    Post subject: Re: SANE can no longer see my networked scanner Reply with quote

m27315 wrote:
Previously, I was able to scan from my HP Photosmart 7520 over my network using SANE (XSANE), GIMP, and hplip. However, a few months ago, something got upgraded or changed, and now I can no longer scan. Whenever I use Gimp (File > Create > XSane: Device Dialog..), it comes back almost immediate after "scanning for devices", complaining:

Code:
no devices available


I have tried to follow this guide: https://wiki.gentoo.org/wiki/HPLIP.

And, everything seems to be fine.

How can I troubleshoot this? Has anybody else had this problem?

Thanks!


I had this problem with a brother mfc, after a sane update - no devices. In that case the backend file got nuked from
Code:
/etc/sane.d/dll.conf

For HP scanners the backend is hpaio so if
Code:
grep hpaio /etc/sane.d/dll.conf
returns nothing, you could try adding it back. That worked for me.
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m27315
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PostPosted: Mon Nov 23, 2015 11:14 pm    Post subject: Re: SANE can no longer see my networked scanner Reply with quote

bbgermany wrote:
are you running saned via xinetd or as standalone service? I had a similiar issue as i was running it via xinetd. As soon as i switched back to standalone service, i was able to use my hp deskjet scanner/printer combination again.

Actually, I did not have either one running. 8O I started saned, but it did not make any difference. I still get the same error message almost immediately - "no devices found". ... Is saned required for networked scanners?

ian.au wrote:
I had this problem with a brother mfc, after a sane update - no devices. In that case the backend file got nuked from
Code:
/etc/sane.d/dll.conf

For HP scanners the backend is hpaio so if
Code:
grep hpaio /etc/sane.d/dll.conf
returns nothing, you could try adding it back. That worked for me.

It is still listed, so I think that's ok.

Code:
$ grep hp /etc/sane.d/dll.conf
31:hp
32:hp3900
33:hpsj5s
34:hp3500
35:hp4200
36:hp5400
37:hp5590
38:hpljm1005
88:# Add support for the HP-specific backend.  Needs net-print/hplip installed.
89:hpaio

Thanks for the suggestions, both of you. I appreciate the help very much.

Any other suggestions?
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bbgermany
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PostPosted: Tue Nov 24, 2015 7:59 am    Post subject: Reply with quote

Hi,

i think i misunderstood you a bit. You should check your /etc/sane.d/net.conf if your device is listed via ip or dns-name there. IIRC this file is used if you want to connect to a network scanner as client ;)

greets bb
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m27315
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PostPosted: Tue Nov 24, 2015 2:11 pm    Post subject: Reply with quote

bbgermany wrote:
i think i misunderstood you a bit. You should check your /etc/sane.d/net.conf if your device is listed via ip or dns-name there. IIRC this file is used if you want to connect to a network scanner as client ;)

Thanks for the tip. I had already found that one via Google, and I added my ip:

Code:
$ cat /etc/sane.d/net.conf
192.168.0.11

Am I missing something? Is there a special format maybe? I haven't been able to find any examples, except of people using either hostnames or IP addresses directly.

Thanks!
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m27315
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PostPosted: Tue Nov 24, 2015 3:57 pm    Post subject: installed packages Reply with quote

What relevant packages do you two have installed with use flags? I have:

Code:
$ emerge -pvt cups xsane sane-backends hplip avahi

These are the packages that would be merged, in reverse order:

Calculating dependencies... done!
[ebuild   R    ] net-print/hplip-3.14.10::gentoo  USE="X fax hpcups kde libnotify (policykit) qt4 scanner snmp static-ppds -doc -hpijs -libusb0 -minimal -parport" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R    ]  media-gfx/xsane-0.999-r1::gentoo  USE="gimp jpeg lcms nls ocr png tiff" 0 KiB
[ebuild   R    ]   media-gfx/sane-backends-1.0.24-r5::gentoo  USE="avahi ipv6 snmp threads usb -doc -gphoto2 -systemd -v4l -xinetd" ABI_X86="32 (64) (-x32)" SANE_BACKENDS="hp net -abaton -agfafocus -apple -artec -artec_eplus48u -as6e -avision -bh -canon -canon630u -canon_dr -canon_pp -cardscan -coolscan -coolscan2 -coolscan3 -dc210 -dc240 -dc25 -dell1600n_net -dmc -epjitsu -epson -epson2 -fujitsu -genesys -gt68xx -hp3500 -hp3900 -hp4200 -hp5400 -hp5590 -hpljm1005 -hpsj5s -hs2p -ibm -kodak -kodakaio -kvs1025 -kvs20xx -kvs40xx -leo -lexmark -ma1509 -magicolor -matsushita -microtek -microtek2 -mustek -mustek_pp -mustek_usb -mustek_usb2 -nec -niash -p5 -pie -pixma -plustek -plustek_pp -pnm -qcam -ricoh -rts8891 -s9036 -sceptre -sharp -sm3600 -sm3840 -snapscan -sp15c -st400 -stv680 -tamarack -teco1 -teco2 -teco3 {-test} -u12 -umax -umax1220u -umax_pp -xerox_mfp" 0 KiB
[ebuild   R    ]    net-dns/avahi-0.6.31-r10::gentoo  USE="dbus gdbm gtk introspection ipv6 nls qt4 -autoipd -bookmarks -doc -gtk3 -howl-compat -mdnsresponder-compat -mono -python (-selinux) {-test} -utils" ABI_X86="32 (64) (-x32)" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R    ]  net-print/cups-2.0.3::gentoo  USE="X acl dbus pam ssl threads usb -debug -java -kerberos -lprng-compat -python (-selinux) -static-libs -systemd -xinetd -zeroconf" ABI_X86="32 (64) (-x32)" LINGUAS="ca cs de es fr it ja pt_BR ru" PYTHON_TARGETS="python2_7" 0 KiB

Total: 5 packages (5 reinstalls), Size of downloads: 0 KiB

Do you have anything different?
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bbgermany
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PostPosted: Tue Nov 24, 2015 4:41 pm    Post subject: Reply with quote

Hi,

i dont have a real network based scanner/printer. I have a HP Deskjet 1050A AIO system which is connected via usb to a cubietruck. I have sane-backends-1.0.25 installed with the useflags for net and hp systems. I share the scanner with Windows machines and linux machines. i havent looked into the linux system fully, but i think the backend for net should be enough.

bb
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m27315
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PostPosted: Tue Nov 24, 2015 4:43 pm    Post subject: Reply with quote

bbgermany wrote:
i dont have a real network based scanner/printer. I have a HP Deskjet 1050A AIO system which is connected via usb to a cubietruck. I have sane-backends-1.0.25 installed with the useflags for net and hp systems. I share the scanner with Windows machines and linux machines. i havent looked into the linux system fully, but i think the backend for net should be enough.

Ok, thanks! ... How do you like the cubietruck? ... I also had to fire up my Windows VM to get some scanning done. :(
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m27315
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PostPosted: Tue Nov 24, 2015 6:16 pm    Post subject: SOLVED - finally!!!! Reply with quote

Thanks to bbgermany and ian.au for all the help! :)

Short Answer:

In addition to other requirements, the CUPS print URI must match a specific format; otherwise, the printer will be unrecognized. My new, working printer.conf looks like:

Code:
$ cat /etc/cups/printers.conf
# Printer configuration file for CUPS v2.0.3
# Written by cupsd on 2015-11-24 11:50
# DO NOT EDIT THIS FILE WHEN CUPSD IS RUNNING
<Printer HP_Photosmart_7520_series>
UUID urn:uuid:112e87a4-b284-33f3-4ea3-4748f44fd861
Info HP Photosmart 7520 series
Location Office
DeviceURI hp:/net/Photosmart_7520_series?ip=192.168.0.11
State Stopped
StateMessage Rendering completed
StateTime 1448380948
Reason paused
Type 4
Accepting Yes
Shared No
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
</Printer>

The DeviceURI is the critical line for this case.

Code:
DeviceURI hp:/net/Photosmart_7520_series?ip=192.168.0.11

Previously, I had:
Code:
DeviceURI hp:/net/HP_Photosmart_7520_series?ip=192.168.0.11

Which was auto-generated and did NOT work.

Troubleshooting:

This pointed me in the right direction:

Code:
$ hp-check -t
...
HP Linux Imaging and Printing System (ver. 3.14.10)
Dependency/Version Check Utility ver. 15.1
...
-----------------------
|  Scan Configuration |
-----------------------

 hpaio                HPLIP-SANE-Backend        REQUIRED        -               3.14.10         OK         'hpaio found in /etc/sane.d/dll.conf'
 scanext              Scan-SANE-Extension       REQUIRED        -               3.14.10         OK         -

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

No Scanner found.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------


Photosmart_7520_series
----------------------
Type: Printer
Device URI: hp:/net/HP_Photosmart_7520_series?ip=192.168.0.11
error: Unsupported model: HP_Photosmart_7520_series
error: Communication status: Failed


Also, this post suggests that the connection method (hp vs socket) is critical:

http://lists.alioth.debian.org/pipermail/sane-devel/2009-February/024117.html

So, I played with variations of the printer name that I had seen in various auto-detection results, restarting cups after each change, and testing with "scanimage -L" until it was found.

Now, the checking tool reports:

Code:
$ hp-check -t
...
-----------------------
|  Scan Configuration |
-----------------------

 hpaio                HPLIP-SANE-Backend        REQUIRED        -               3.14.10         OK         'hpaio found in /etc/sane.d/dll.conf'
 scanext              Scan-SANE-Extension       REQUIRED        -               3.14.10         OK         -

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

device `hpaio:/net/Photosmart_7520_series?ip=192.168.0.11' is a Hewlett-Packard Photosmart_7520_series all-in-one


--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------


HP_Photosmart_7520_series
-------------------------
Type: Printer
Device URI: hp:/net/Photosmart_7520_series?ip=192.168.0.11
PPD: /etc/cups/ppd/HP_Photosmart_7520_series.ppd
PPD Description: HP Photosmart 7520 Series, hpcups 3.14.10
Printer Rendering completedPhotosmart_7520_series disabled since Tue 24 Nov 2015 10:02:28 AM CST -
Communication status: Good
...

And, scanimage reports:

Code:
$ scanimage -L
device `hpaio:/net/Photosmart_7520_series?ip=192.168.0.11' is a Hewlett-Packard Photosmart_7520_series all-in-one


Other Requirements and Facets:

Here are the contents of other configuration files, which may be helpful. (Incidentally, I do not know which are absolutely required, because I did not test all of these exhaustively.)

Code:
$ cat /etc/portage/make.conf
...
SANE_BACKENDS="hp net"
...

You must rebuild sane-backends, if you modify the above setting.

Code:
$ cat /etc/sane.d/dll.conf
# enable the next line if you want to allow access through the network:
net
hp
# Add support for the HP-specific backend.  Needs net-print/hplip installed.
hpaio

I trimmed the above file, so that sane did not try to load every conceivable plug-in under the sun. The above is all that is required for the HP Photosmart 7520.

Code:
 cat /etc/sane.d/net.conf
# This is the net backend config file.

## net backend options
# Timeout for the initial connection to saned. This will prevent the backend
# from blocking for several minutes trying to connect to an unresponsive
# saned host (network outage, host down, ...). Value in seconds.
# connect_timeout = 60

## saned hosts
# Each line names a host to attach to.
# If you list "localhost" then your backends can be accessed either
# directly or through the net backend.  Going through the net backend
# may be necessary to access devices that need special privileges.
# localhost
192.168.0.11

Replace with the IP address of your remote networked scanner.

Code:
$ emerge -pvt xsane sane-backends hplip cups

These are the packages that would be merged, in reverse order:

Calculating dependencies... done!
[ebuild   R    ] net-print/hplip-3.14.10::gentoo  USE="X fax hpcups kde libnotify (policykit) qt4 scanner snmp static-ppds -doc -hpijs -libusb0 -minimal -parport" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R    ]  net-print/cups-2.0.3::gentoo  USE="X acl dbus pam ssl threads usb -debug -java -kerberos -lprng-compat -python (-selinux) -static-libs -systemd -xinetd -zeroconf" ABI_X86="32 (64) (-x32)" LINGUAS="ca cs de es fr it ja pt_BR ru" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R    ]  media-gfx/xsane-0.999-r1::gentoo  USE="gimp jpeg lcms nls ocr png tiff" 0 KiB
[ebuild   R    ]   media-gfx/sane-backends-1.0.24-r5::gentoo  USE="avahi ipv6 snmp threads usb -doc -gphoto2 -systemd -v4l -xinetd" ABI_X86="32 (64) (-x32)" SANE_BACKENDS="hp net -abaton -agfafocus -apple -artec -artec_eplus48u -as6e -avision -bh -canon -canon630u -canon_dr -canon_pp -cardscan -coolscan -coolscan2 -coolscan3 -dc210 -dc240 -dc25 -dell1600n_net -dmc -epjitsu -epson -epson2 -fujitsu -genesys -gt68xx -hp3500 -hp3900 -hp4200 -hp5400 -hp5590 -hpljm1005 -hpsj5s -hs2p -ibm -kodak -kodakaio -kvs1025 -kvs20xx -kvs40xx -leo -lexmark -ma1509 -magicolor -matsushita -microtek -microtek2 -mustek -mustek_pp -mustek_usb -mustek_usb2 -nec -niash -p5 -pie -pixma -plustek -plustek_pp -pnm -qcam -ricoh -rts8891 -s9036 -sceptre -sharp -sm3600 -sm3840 -snapscan -sp15c -st400 -stv680 -tamarack -teco1 -teco2 -teco3 {-test} -u12 -umax -umax1220u -umax_pp -xerox_mfp" 0 KiB

Total: 4 packages (4 reinstalls), Size of downloads: 0 KiB

The versions and use flags for the relevant packages, which works for me. Here are portage configs for me:

Code:
$ cat /etc/portage/package.use/use.use
...
media-gfx/xsane gimp ocr
media-gfx/sane-backends snmp avahi
net-print/hplip fax scanner snmp static-ppds


Conclusion:

Thanks again for all the help! I'm thankful this is fixed. Now that my OCD has been soothed, I can return to my normal life. ;)
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