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Old 04-29-2008, 11:27 AM   #1
BCarey
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scanner permissions problem on -current


Well, that's it. Regular user has been added to the scanner group but is unable to open scanner (using xsane). The printer is a brother mfc-7420, and I'm using brother's scanner drivers. I see the rule in /etc/udev/rules.d. Root user is able to open the scanner.

Thanks,

Brian
 
Old 04-29-2008, 11:39 AM   #2
Carpo
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chmod 666 /dev/xxx
 
Old 04-29-2008, 11:52 AM   #3
BCarey
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Quote:
Originally Posted by Carpo View Post
chmod 666 /dev/xxx
Didn't work. And in any case the permissions are okay (664, group scanner, of which I am a member).

Brian
 
Old 04-29-2008, 02:32 PM   #4
dissociative
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first be sure to read all the sane documentation first, the udev permissions must be modified for the respective device, I think that the device isn't in the /dev/ directory anymore, but I cannot remember well why It should be in something like /proc/usb/00x/00x

Last edited by dissociative; 04-29-2008 at 02:33 PM. Reason: typo
 
Old 04-29-2008, 03:03 PM   #5
Stroker
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Quote:
Originally Posted by BCarey View Post
Didn't work. And in any case the permissions are okay (664, group scanner, of which I am a member).

Brian
What does:

SANE_DEBUG_[BACKENDNAME]=255 scanimage -L

as user give you?
 
Old 04-29-2008, 03:33 PM   #6
BCarey
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Quote:
Originally Posted by Stroker View Post
What does:

SANE_DEBUG_[BACKENDNAME]=255 scanimage -L

as user give you?
Code:
device `brother2:bus1;dev1' is a Brother MFC-7420 USB scanner
Brian
 
Old 04-29-2008, 03:36 PM   #7
BCarey
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Quote:
Originally Posted by dissociative View Post
first be sure to read all the sane documentation first, the udev permissions must be modified for the respective device, I think that the device isn't in the /dev/ directory anymore, but I cannot remember well why It should be in something like /proc/usb/00x/00x
Well, when I plug in the scanner, the following gets created in my /dev directory:

Code:
crw-rw-r-- 1 root scanner 189, 259 2008-04-29 14:32 /dev/usbdev3.4
Brian
 
Old 04-29-2008, 03:49 PM   #8
dive
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Check /proc/bus/usb/devices for the device. I had to do:

chmod a+rw /proc/bus/usb/001/002

To get mine to work for users.

*Edit: I guess chowning to root:scanner would also work.

Last edited by dive; 04-29-2008 at 03:50 PM.
 
Old 04-29-2008, 03:55 PM   #9
BCarey
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Quote:
Originally Posted by dive View Post
Check /proc/bus/usb/devices for the device. I had to do:

chmod a+rw /proc/bus/usb/001/002

To get mine to work for users.

*Edit: I guess chowning to root:scanner would also work.
That works, but that means that I have to do this every time I unplug or plug in the scanner. Shouldn't this be automatic?

Brian
 
Old 04-29-2008, 06:45 PM   #10
psychicist
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You should add an entry to /etc/udev/rules.d/80-libsane.rules and submit it to the udev maintainer(s) as well so it will be included in a future udev release by default. I've had to do this with several devices over the last few years, unfortunately not all available devices are included in the udev rules by default.
 
Old 04-29-2008, 07:10 PM   #11
allend
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This was discussed in an earlier thread.
http://www.linuxquestions.org/questi...urrent-594071/
 
  


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