Could not fetch string descriptor pipe error

1. I have Ubu 14.04 on one partition and I just updated from Ubu 15.10 to Ubu 16.04 on another partition. In 14.04, xsane works fine. In 15.10, I could not get xsane to find the scanner. Now I upgraded to 16.04 and xsane still finds no device.

   The scanner works fine in 14.04. Never worked in 15.10, won’t work now in 16.04. The scanner is part of an all in one scanner printer Epson L351. It works fine in 14.04.

   This is the output of sane-find-scanner and scanimage -L

   pedro@pedro-275E4E-275E5E:~$ sudo sane-find-scanner

   # 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.

   could not fetch string descriptor: Pipe error
   could not fetch string descriptor: Pipe error
   found USB scanner (vendor=0x04b8 [EPSON], product=0x08a1 [EPSON L350 Series]) at libusb:004:005
   # 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.
   pedro@pedro-275E4E-275E5E:~$

   Don’t know what a pipe error is. but the scanner is detected.

   pedro@pedro-275E4E-275E5E:~$ sudo scanimage -L
   [sudo] password for pedro:

   No scanners were identified. If you were expecting something different,
   check that the scanner is plugged in, turned on and detected by the
   sane-find-scanner tool (if appropriate). Please read the documentation
   which came with this software (README, FAQ, manpages).
   pedro@pedro-275E4E-275E5E:~$

   I have the correct settings in /etc/sane.d/epson.conf

   # usb 0x4b8 0x110
   #[EPSON L350 Series]) at libusb:004:003

   usb 0x04b8 0x08A1

   # And for the scanner module, use the following configuration:
   usb /dev/usbscanner0

   usb /dev/usb/scanner0

   This has gone on a long time now. Any tips out there please? Permissions??

   I tried running xsane as root, got danger warnings, went ahead, but still no devices found.

   I borrowed a simple canon flatbed usb powered scanner. Xsane finds it and it works. I did not have to set anything at all. Just works, as does my Epson in 14.04.

   What is wrong here? I was hoping the upgrade would solve the problem, then I could move to 16.04 completely.

   ---

2. Re: scanner problem
   

   I went to the Epson webpage, downloaded and installed epkowa, which installs iscan, which is like their spin of xsane I suppose.

   I noticed in /etc/epkowa/epkowa.conf that it said:

   # For any USB scanner not known to the backend (yet), you may, at your
   # own peril(!!), force the backend to recognise and use it via libusb.
   # You can do so by the following configuration command:
   #
   usb 04b8 08a1
   #
   # SEIKO EPSON’s USB vendor ID is ‘0x04b8’ (without quotes). In order
   # to find the USB product ID, use lsusb(1).
   # A sample configuration for the Epson Perfection 1650 (Epson GT-8200),
   # which has a product ID of 0x0110, would look as follows:
   #
   #usb 0x04b8 0x0110

   «at your peril» gave me the idea to mask this line in epson.conf and epson2.conf so I wrote a few ###

   Long story short, now it works!!

   Problem may have been multiple .conf files in /etc/sane.de pointing at the same machine! No idea, but it works! Took me a year!

   ---

3. Re: scanner problem
   

   Thanks for showing how you solved the problem. Please mark this thread as [SOLVED], using Thread Tools at the top right.

   
   I drink my Ubuntu black, no sugar.
   Ubuntu user 28819

   ---

4. Re: scanner problem
   

   Hi There,

   I am facing same issue with my pixma MG3640 while trying to configure with 14.04.

   Usb is detecting as scanner(came to know this through sane-find-scanner)

   But scanimage -L is empty.

   Seemingly canon is not providing any linux drivers for this at the moment. If you have any suggestion please let me know.

   Thanks,

   ---

5. Re: scanner problem
   

   It’s frustrating isn’t it? Drove me crazy for a year!

   Try setting the values of the Vendor ID and Product number from sane-find-scanner in /etc/sane.d/pixma.conf

   You can get the Vendor ID and Product Number by entering lsusb in a termminal too! If it sees your scanner, they should show up!

   You need to be root to do this. In a terminal

   sudo gedit

   You will have to enter your admin password, that will open gedit as root. Open /etc/sane.d/pixma.conf or whatever .conf is for your scanner,then just enter this line anywhere. (All the other lines will be commented out with #). At the bottom is good.

   You need this format: usb YourVendorID YourProductNumber The example below is mine:

   usb 04b8 08a1

   Of course, replace the 2 hexadecimal numbers with your Vendor ID and product number. See if xsane finds your scanner then.

   This worked for me in 14.04, but not in 15.10 or 16.04. In 16.04, I put hash tags in front of everything, and it works! Figure that out!

   Last edited by pedro_rodriguez2; May 1st, 2016 at 01:00 AM.

   ---

6. Re: scanner problem
   

   Wow i’m impressed with how you got it to work.
   I have a hardware scanner too (forget which brand) and it works in v14.04 without issues.
   I’m afraid to try it in v16 after experiencing and reading about some of these types of issues.

   There’s no printer drivers for my hardware except for one crazy old long script written and it edits a lot of system folders so I never ran it.

   I just put stuff on flash drive and print from Windows at my local library.

   May Peace Prevail for Life in all Realms of Creation —Masahisa Goi

   ---

7. Re: scanner problem
   

   I borrowed a friend’s little Canon scanner, it’s a flatbed usb powered scanner. Works in Ubuntu without any problem, no configuration at all. Plug it in, scan. They only cost about 300 RMB now here in China, say $ 50. My Epson multi machine was more sensitive, but it works now! I think these scanner printer machines can confuse the system.

   Printer and scanner are not the same.

   What does

   lsusb

   show on your system?

   I have the old version of Ubu on 1 partition and the newer version on another partition. When I get 16.04 working correctly, I’ll move to it completely.

   ---

8. Re: scanner problem
   

   Hello pedro_rodriguez2,

   Thanks for your detailed explanation and time taken to review this.

   The same steps I tried here, pixma.conf is having same entries as there in lsusb.

   ========
   root@SydLap:~# scanimage -V
   scanimage (sane-backends) 1.0.26git; backend version 1.0.26

   root@SydLap:~# sane-find-scanner

   # 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.

   found USB scanner (vendor=0x04a9 [Canon], product=0x178a [MG3600 series]) at libusb:002:005
   found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at libusb:002:002

   root@SydLap:~# scanimage -L

   No scanners were identified. If you were expecting something different….
   ===============================================

   Dont know where I am doing wrong, this is 14.04 version and I dont see much help specific to my problem in common forums out there.

   If anyone got a clue here on how to proceed, this would be appreciated deeply.

   Thanks,

   ---

9. Re: scanner problem
   

   OK, try this, it can’t do any harm:

   In /etc/sane.d I have a file

   canon_dr.conf

   It lists a lot of canon scanners. I don’t see your one, but you can append it. Use gedit as root.

   at the bottom, just add the data from sane-find-scanner:

   # my crazy Canon scanner
   usb 0x04a9 0x178a

   See if that works!

   ---

10. Re: scanner problem
    

    Hi,

    Seems like I am unlucky, my crazy scanner is not at all detecting.

    Funny part is I can see two lines with sane-find-scanner, the second one stays there evenif the scanner is not connected(as a history: I got sane-find-scanner catch my MG3640 only after a manual sane update using git)
    ======
    found USB scanner (vendor=0x04a9 [Canon], product=0x178a [MG3600 series]) at libusb:002:005
    found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at libusb:002:002

    They say no driver roll out for linux, too bad if it is true. My customer has got a bad impression with linux already lol..
    http://www.canon-europe.com/support/…20%2832-bit%29

    Anyway, thanks for your time, if you got anything further please post here. Meanwhile I will try other tips and will surely update here if I manage to get this working.

    Thanks,

    Last edited by syd2; May 4th, 2016 at 11:55 AM.

    ---

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Hey,

I am trying to get the Ricoh SP 150SU to work. There are drivers/packages for almost all other Linux distributions, just not Arch. I already got it to print, by just copying the files from the provided .deb-package to their destinations, but now I’m stuck with the scanning function of the device. There even is an install.sh inside the SANE-package, which doesn’t work out of the box in Arch. I had a look into it, read some SANE documentation and tried a few steps.

What I did so far is:

• Copy the .so-Files to /usr/lib/sane (script works until here)

• Add «alto» to /etc/sane.d/dll.conf

• Create file /etc/sane.d/alto.conf

• Add lines to /usr/lib/udev/rules.d/49-sane.rules

• Added my user to group «scanner» (also tried running all commands with sudo)

• Reboot

cat /etc/sane.d/alto.conf:

usb # tried without this, too
usb 0x05ca 0x0454
scsi RICOH IS60

cat /usr/lib/udev/rules.d/49-sane.rules:

[...]
# RICOH SP 150SU Scanner
ATTRS{idVendor}=="05ca", ATTRS{idProduct}=="0454", MODE="0664", GROUP="scanner", ENV{libsane_matched}="yes"
# RICOH SP 150SUw Scanner
ATTRS{idVendor}=="05ca", ATTRS{idProduct}=="0456", MODE="0664", GROUP="scanner", ENV{libsane_matched}="yes"
[...]

sane-find-scanner:

# 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".

could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x05ca [RICOH], product=0x0454 [SP 150SU]) at libusb:001:004
could not fetch string descriptor: Pipe error

# 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

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

You can see the full downloads page here.

Can someone please guide me to the right direction? I am not totally new to Arch or Linux in general, but it is my first time trying to install a device without just installing a package (which I would do if there was one, of course)

Thank you in advance, BlkChockr

Last edited by BlkChockr (2019-07-16 18:08:36)

ALT LINUX 8.0
xsane не видит

[root@a151f1 ~]# lsusb | grep ’04a9′
Bus 001 Device 008: ID 04a9:1912 Canon, Inc.
[root@a151f1 ~]# getfacl /dev/bus/usb/001/008
getfacl: Removing leading ‘/’ from absolute path names
# file: dev/bus/usb/001/008
# owner: root
# group: lp
user::rw-
group::rw-
other::r—
================================

root@a151f1 ~]# sane-find-scanner

  # 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=0x0924 [Xerox], product=0x42e2 [WorkCentre 3335]) at libusb:001:004
found USB scanner (vendor=0x04a9 [Canon], product=0x1912 [LiDE 400]) at libusb:001:008
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
  # 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.
================================================

[root@a151f1 ~]# scanimage -L
MIB search path: /usr/share/snmp/mibs:/usr/share/mibs/net-snmp:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/tubs:/usr/share/mibs/cisco:/usr/share/pibs/ietf:/usr/share/pibs/tubs:
Cannot find module (NET-SNMP-AGENT-MIB): At line 0 in (none)
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (IF-MIB): At line 0 in (none)
Cannot find module (IP-MIB): At line 0 in (none)
Cannot find module (TCP-MIB): At line 0 in (none)
Cannot find module (UDP-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none)
Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none)
Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none)
Cannot find module (DISMAN-SCHEDULE-MIB): At line 0 in (none)
Cannot find module (EtherLike-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-TYPES): At line 0 in (none)
Cannot find module (IPV6-ICMP-MIB): At line 0 in (none)
Cannot find module (IPV6-MIB): At line 0 in (none)
Cannot find module (IPV6-TCP-MIB): At line 0 in (none)
Cannot find module (IPV6-UDP-MIB): At line 0 in (none)
Cannot find module (UCD-IPFWACC-MIB): At line 0 in (none)
Cannot find module (SNMP-TARGET-MIB): At line 0 in (none)
Cannot find module (TUNNEL-MIB): At line 0 in (none)
Cannot find module (IPV6-FLOW-LABEL-MIB): At line 0 in (none)
Cannot find module (UCD-DISKIO-MIB): At line 0 in (none)
Cannot find module (LM-SENSORS-MIB): At line 0 in (none)
Cannot find module (UCD-SNMP-MIB): At line 0 in (none)
Cannot find module (UCD-DEMO-MIB): At line 0 in (none)
Cannot find module (NET-SNMP-VACM-MIB): At line 0 in (none)
Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (IP-FORWARD-MIB): At line 0 in (none)
Cannot find module (SNMP-NOTIFICATION-MIB): At line 0 in (none)
Cannot find module (SNMP-MPD-MIB): At line 0 in (none)
Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none)
Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none)
Cannot find module (SNMPv2-TM): At line 0 in (none)
Cannot find module (NET-SNMP-PASS-MIB): At line 0 in (none)
Cannot find module (NET-SNMP-EXTEND-MIB): At line 0 in (none)
Cannot find module (UCD-DLMOD-MIB): At line 0 in (none)

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

В Linux’е полный ноль…