[sane-devel] Canon_pp problem with ppdev

[Matthew Duggan]

On 06/10/2008, at 1:11 AM, sane.20.bertrandb at spamgourmet.com wrote:

> hi,
>
> I have a PC linux box with gentoo with kernerl 2.6.24 (same problem  
> with
> 2.6.25).
> when the ppdev module is load i can't use scanimage nor as root nor
> other user
> 'SANE_DEBUG_CANON_PP=100 scanimage'  give me
> [canon_pp] detect_mode: Opening port 0x378
> [canon_pp] detect_mode: Claiming port.
> [canon_pp] detect_mode: Unable to claim port
> [canon_pp] sane_init: Error detecting port mode on 0x378!
>
> when i unload the ppdev module scanimage works but only for root. Even
> users in lp group can't use scanner.
>
> what's the right version of canon_pp to use with 2.6 kernel ?

Hi,

I don't think there's particularly a right version to use, the backend  
hasn't been touched in years.  Although, the parport_pc has been  
slightly broken for quite a while:

http://bugzilla.kernel.org/show_bug.cgi?id=7491

That might explain what you're seeing?  Is the I/O port displayed the  
same when you don't have ppdev loaded?  If not, er.. try messing with  
the bios settings so the port matches what parport_pc assumes?  Sorry  
it's not a great solution.. and sorry for the slow reply.

Cheers,

- Matthew Duggan