scanner permissions problem on -current

BCarey · 04-29-2008, 11:27 AM

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

Carpo · 04-29-2008, 11:39 AM

chmod 666 /dev/xxx

BCarey · 04-29-2008, 11:52 AM

Quote:

Originally Posted by Carpo

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

dissociative · 04-29-2008, 02:32 PM

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

Stroker · 04-29-2008, 03:03 PM

Quote:

Originally Posted by BCarey

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?

BCarey · 04-29-2008, 03:33 PM

Quote:

Originally Posted by Stroker

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

BCarey · 04-29-2008, 03:36 PM

Quote:

Originally Posted by dissociative

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

dive · 04-29-2008, 03:49 PM

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.

BCarey · 04-29-2008, 03:55 PM

Quote:

Originally Posted by dive

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

psychicist · 04-29-2008, 06:45 PM

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.

allend · 04-29-2008, 07:10 PM

This was discussed in an earlier thread.
http://www.linuxquestions.org/questi...urrent-594071/