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[Jacob Moh <question77831@xxxxxxxxxxxxxxxxxxxxx>]

Question #77831 on synaptic in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/synaptic/+question/77831

Jacob Moh gave more information on the question:


Hi Michael.  Tried your suggestions but the same error appeared
(scanimage: open of device snapscan:libusb:005:002 failed: Invalid
argument).  So, I went to synaptic package manager and marked libusb for
reinstallation.  Then, I uninstalled my sane-backend-1.0.20 ("sudo make
uninstall") and restarted my computer.  

After reboot, I was going to reinstall the sane backend but something
interesting happened:  I decided to try your suggestions once more and,
to my surprise, the scanner began scanning when I typed 'export
SANE_DEBUG_SNAPSCAN=5 && scanimage -vvv > /dev/null' in the terminal.

Without reinstalling the sane backend, I used xsane again (with sane
backend uninstalled) and this time xsane detected the scanner and I was
able to scan.  So, the scanner is working fine now, it seems.  I've
checked my file system: sane and snapscan folders are still intact with
the firmware in place.  

I've unplugged the scanner and rebooted my system twice and replugged
the scanner.  It works.  The, I repeated the procedure.  It works even
now.  But I'm not sure if it will malfunction again once I install or
update a software.  

What do you think the problem was?  Maybe a conflict in the libusb or
the sane software?  Either way, your suggestions has helped me a lot.
Thank you so much.

Jacob


On Mon, 2009-08-03 at 22:15 +0000, Jacob Moh wrote: 

> Your question #77831 on synaptic in ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/synaptic/+question/77831
> 
>     Status: Needs information => Open
> 
> You gave more information on the question:
> Hi Michael.  When the scanner is working, it continues to work even after
> reboot.  Even if I unplug and unplug the usb, it continues to work until I
> install something else.  The scanner has its own power supply.
> 
> I'll try your suggestions when I get into my office this morning (it's
> currently 6am here).  Give me some time and I'll get back to you with the
> results.  Thanks again for everything.
> 
> Jacob
> 
> 
> Jacob Moh Yii Jenq
> St. Peter's College
> Mile 1, Jalan Tun Abang Haji Openg
> P.O. Box 327
> 93704 Kuching, Sarawak
> MALAYSIA
>  
> Tel.:        (O) 244 496   
> (H/P) 019- 867 4848
> Email:      jacobmoh@xxxxxxxxxxxx 
>                 jacobmoh@xxxxxxxxxxxx 
> 
> -----Original Message-----
> From: bounces@xxxxxxxxxxxxx [mailto:bounces@xxxxxxxxxxxxx] On Behalf Of
> Michael Fletcher
> Sent: Monday, August 03, 2009 9:49 PM
> To: jacobmoh@xxxxxxxxxxxx
> Subject: Re: [Question #77831]: Scanner Detection
> 
> Your question #77831 on synaptic in ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/synaptic/+question/77831
> 
>     Status: Open => Needs information
> 
> Michael Fletcher requested for more information:
> I suspect the issue is a bug in the scanner driver.  Its unusual for a
> scanner to stop working when you run an installation.  I though maybe
> the firmware was being deleted or the configuration was being deleted.
> You said it wasn't.
> 
> The scanner failing after every installation is unusual.  I suspect its
> a coincidence that it fails after you do an installation.  Something
> else is probably making it fail.
> 
> Once the scanner is working does it stay working after a reboot?
> 
> Does the scanner stay working if you just unplug and plug the scanner
> back in.
> 
> Does this scanner have its own power supply or is it powered by USB?
> I'm wondering it its not being reset properly.
> 
> Can you run 'sudo lsusb' and 'sudo sane-find-scanner -qv'.  This will
> show in the sane backends can detect the scanner at all.  Try and run
> this both when its working and when it fails.
> 
> Then run 'export SANE_DEBUG_SNAPSCAN=5 && scanimage -vvv > /dev/null'.
> This should perform a scan.  Try and run this both when its working and
> when it fails.
>

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