[sane-devel] Sane only available to Super User - Canon FP330P

[Kim L. Mantle]

Matthew

Many thanks for your advice.

I have taken heed of your advice and completed those changes to the
canon_pp.conf file and all works sweetly.

Tell me though Matthew - is option 2 an option, as such, or can the changes
be made in conjunction with Till's suggestion plus your amendment (option
1)?

Kind regards

Kimbo

-----Original Message-----
From: Matthew Duggan [mailto:stauff at guarana.org] 
Sent: Monday, 15 December 2003 10:57 a.m.
To: Kim L. Mantle
Cc: sane-devel at lists.alioth.debian.org
Subject: Re: [sane-devel] Sane only available to Super User - Canon FP330P
Importance: High


On Sat, Dec 13, 2003 at 08:47:48PM +1300, Kim L. Mantle wrote:
> I have MandrakeLinux 9.2.
> 
> For the past month or so I have had great difficulty trying to find 
> out why Xsane would only recognise 'Super User' and not 'Normal User'.
> 
> I have made sure on each occasion I have re-installed 9.2 that there 
> is only one installation of Sane. I have then installed/upgraded (Sane
Backends 1.0.12-5mdk) - also used the version on the Distro's CDs - and then
Xsane and also tried it the other way around. But each time I get the
message 'No Device found' when using 'Normal User' - yet when I use 'Super
User' - bang... in comes Xsane and I am also then able to use Gimp.
...

Hi,

There are two options to fix this:

1. You can set up saned as Till suggested (this may also yield speed 
improvements) however, by default the canon_pp backend saves data in 
the home directory of the user running the program, and saned runs as 
root, so you may wish to consider changing this line from canon_pp.conf:
-
calibrate ~/.sane/canon_pp-calibration-pp0 parport0
-
to something like this:
-
calibrate /var/sane/canon_pp-calibration
-
Leave off the port name too, because there's a bug with the way the canon_pp
backend handles port names from saned.


2. The canon_pp backend uses the correct kernel methods to access the
parallel port, however you still need to give your non-super-user account
access.  To do this, check the permissions on 
/dev/parport0 with "ls -l /dev/parport0".  On a Debian system it 
will be something like:
-
crw-rw----    1 root     lp        99,   0 Jun 15  2002 /dev/parport0
-
The letters at the front means that it's a character device, readable and
writable by the owner user, and readable and writable by the owner group.
In this case the owner user is "root" (aka superuser) and owner 
group is "lp".  I assume Mandrake is similar in this respect..

To give your regular user access to this port, you can add yourself to the
"lp" group by typing this at the root (superuser) prompt:
-
adduser my_normal_username lp
-

Then if you log out and back in, you will be part of the lp group and should
be able to access the parallel port.

Cheers,

- Matthew Duggan