[sane-devel] How to set permissions on my scasnner device files?

[Klaus Dittrich]

On Thu, Jan 15, 2004 at 11:44:13PM -0700, Scott Navarre wrote:
> Hi,
> 
>   I am setting up an Epson Perfection 1260/Photo scanner thru USB (uses the Plustek driver).  I have upgraded my Red Hat 8.0's SANE backend drivers to version 1.0.13.
>   And now, I can see the scanner using both 'scanimage -L' and 'sane-find-scanner', as root only (I can also use 'xsane' as root only).  If I am not root, 'scanimage -L' finds nothing, and 'sane-find-scanners' finds a scanner on the USB but doesn't identify it.  The man page said something about not having the permissions of the device file set right if this happens.
>   The thing is that when it is displayed, it only shows 'libusb:001:004' as the device name, not something in '/dev' (such as the '/dev/usbscanner0' or '/dev/sg0' as mentioned in the man page).  So how or where do I go to change the permissions???  Out of frustration, I did a 'chmod -R 777 /dev' but it didn't help...
> 
>   Here are my outputs of the 2 commands by root:
> 
> [root at tepeyac root]# scanimage -L                                               
> device `plustek:libusb:001:004' is a Epson Perfection 1260/Photo USB flatbed sca
> nner                                                                            
> [root at tepeyac root]#  sane-find-scanner                                         
>                                                                                 
>   # No SCSI scanners found. If you expected something different, make sure that 
>   # you have loaded a SCSI driver for your SCSI adapter.                        
>                                                                                 
> found USB scanner (vendor=0x04b8 [EPSON], product=0x011d [EPSON Scanner], chip=L
> M9832/3) at libusb:001:004                                                      
>   # Your USB scanner was (probably) detected. It may or may not be supported by 
>   # SANE. Try scanimage -L and read the backend's manpage.                      
>                                                                                 
>   # Scanners connected to the parallel port or other proprietary ports can't be 
>   # detected by this program.                                                   
> [root at tepeyac root]#
> 
>   And here are my outputs of the same 2 commands by a non-root user:
> 
> [claudia at tepeyac claudia]$ 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).                          
> [claudia at tepeyac claudia]$ sane-find-scanner                                    
>                                                                                 
>   # No SCSI scanners found. If you expected something different, make sure that 
>   # you have loaded a SCSI driver for your SCSI adapter.                        
>                                                                                 
> found USB scanner (vendor=0x04b8, product=0x011d, chip=LM983x?) at libusb:001:00
> 4                                                                               
>   # Your USB scanner was (probably) detected. It may or may not be supported by 
>   # SANE. Try scanimage -L and read the backend's manpage.                      
>                                                                                 
>   # Scanners connected to the parallel port or other proprietary ports can't be 
>   # detected by this program.                                                   
>                                                                                 
>   # You may want to run this program as root to find all devices. Once you      
>   # found the scanner devices, be sure to adjust access permissions as          
>   # necessary.                                                                  
> [claudia at tepeyac claudia]$
> 
> Thanks in advance,
>   Scott Navarre

In /etc/fstab change to 
none /proc/bus/usb usbfs defaults,devmode=0666  0  0

Source of information : Henning Meier-Geinitz + man sane-usb

--
Klaus