[sane-devel] USB problems - [was"no devices available"]

earther at eartherdesigns.com earther at eartherdesigns.com
Sat Jun 21 05:20:21 UTC 2008

Yes, you are correct that it is a permissions problem,

I finally got the camera working properly by editing  
/etc/udev/rules.d/40-permissions.rules as per this thread:


I can now run xsane as root but not as user.  I have looked through  
Groups settings several times and everything looks OK so I'm guessing  
I'll need to do more hand-editing.

I'm too tired to do any more with this tonight but tomorrow I will  
revisit your comments and see where I can go with them.

Thanks so much for your thoughts on this.

Quoting kilgota at banach.math.auburn.edu:
> Hi,
> Don't know about the scanner, but I do know a bit about the internals
> of libgphoto2. The problem with the scanner is most probably similar to
> what appears to happen with the camera:
> With approximately 99% probability, I would say that your problem with
> the camera is a permissions problem. Quite likely, what has happened is
> that the camera and perhaps the scanner also, is not listed in any of
> the appropriate files in /etc/udev/rules.d in spite of the fact that
> you have upgraded udev. Either that, or along with the upgraded udev
> the rules are not what you expect. For example, the libgphoto2.rules
> might expect you, as a user, to belong to a group called "camera" or
> some variation on the same theme. One of the things that you might do
> to try to localize the problem is to try running these devices as root.
> If that works, then definitely it is a permissions problem and you need
> to create the right entries in the libgphoto2.rules file and the
> libsane.rules files, which are suitable for yourself, or if you do find
> entries in those files for these devices (look for the USB
> Vendor:Product number combination) and it wants your userid to belong
> to some group and it does not, then either add yourself to the group or
> change the rules file to let you do what you want. By all means, too,
> you can contact Ubuntu and ask them just exactly what they have in mind
> about how they intend for things like this to be done in Hardy Heron. I
> do not know how they are handling such things as upgrades because I am
> not using Ubuntu and instead I usually deal with things like this by
> hand-editing the affected files.
> Sorry that there are these problems with permissions, but the
> alternative is that these problems are not under control and then we
> would have a Linux with all the lack of security that is found in
> Windows. Clearly, none of us want that. But in return for the care
> about security comes some occasional inconvenience, in the form of
> problems like this.
> I hope this helps.
> Theodore Kilgore
> On Fri, 20 Jun 2008, earther at eartherdesigns.com wrote:
>> Good news. I have made some progress after upgrading the Hardy udev
>> package but still not out of the woods.
>> lsusb now prints out correctly:
>> ~$ lsusb
>> Bus 008 Device 001: ID 0000:0000
>> Bus 007 Device 001: ID 0000:0000
>> Bus 006 Device 002: ID 03f0:0205 Hewlett-Packard ScanJet 3300c
>> Bus 006 Device 001: ID 0000:0000
>> Bus 005 Device 001: ID 0000:0000
>> Bus 004 Device 001: ID 0000:0000
>> Bus 003 Device 001: ID 0000:0000
>> Bus 002 Device 006: ID 04a9:30fd Canon, Inc. PowerShot A610 (normal
>> mode)/PowerShot A610 (PTP mode)
>> Bus 002 Device 001: ID 0000:0000
>> Bus 001 Device 001: ID 0000:0000
>> And Sane now finds the scanner:
>> ~# SANE_DEBUG_NIASH=255 scanimage -L
>> [sanei_debug] Setting debug level of niash to 255.
>> [niash] sane_init
>> [niash] Looking for ScanJet 3300C...
>> [niash] _AttachUsb: found libusb:006:003
>> [niash] niash: _ReportDevice 'libusb:006:003'
>> [niash] Looking for ScanJet 3400C...
>> [niash] Looking for ScanJet 4300C...
>> [niash] Looking for HP ScanJet 4300c...
>> [niash] Looking for Snapscan Touch...
>> [niash] Looking for Office Scanner USB 19200...
>> [niash] sane_get_devices
>> device `niash:libusb:006:003' is a Hewlett-Packard ScanJet 3300C
>> flatbed scanner
>> [niash] sane_exit
>> However, when launched, Sane spits out this error:
>> Failed to open device 'niash:libusb:006:002': Device busy.
>> Any ideas?
>> FWIW, the camera is having problems too.  Just in case it might be
>> helpful, here's the error:
>> "An error occurred in the io-library ('Could not claim the USB
>> device'): Could not claim interface 0 (Operation not permitted). Make
>> sure no other program or kernel module (such as sdc2xx, stv680,
>> spca50x) is using the device and you have read/write access to the
>> device."
>> Thanks again for your expertise and patience.
>> Quoting "m. allan noah" <kitno455 at gmail.com>:
>>> xsane is not the problem, but sane probably is. run this at the
>>> command line as root:
>>> SANE_DEBUG_NIASH=255 scanimage -L
>>> and post the output to this list.
>>> allan
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