USB-scanner permissions

[Loïc Martin]

Johann Spies a écrit :
> I have an Epson Perfection 3170 PHOTO scanner which worked
> perfectly under Breezy.  After upgrading to Dapper, I can use it
> as root, but not as normal user.
>
> I use Iscan (from Avasys) with the scanner, but if I run Gimp or
> Xsane as root, I can operate the scanner too.
>
> Most of the documentation tells me to find where the scanner is
> using "$ sudo scanimage -L"  which tells me:
> device `epkowa:libusb:004:004' is a Epson Perfection 3170 flatbed scanner
>
> According the the documentation (i.a. "man sane-usb" ) the
> following should allow the normal user to use the scanner in
> this case:
>
> $ sudo chmod 660 /proc/bus/usb/004/004
>
> But that is not working for me. 
>
> As I understand it the hotplug plays a role here, but hotplug is
> no longer an Ubuntu package and I suspect that something has to
> be done to udev to get this working.  But I know too little
> about udev ...
>
> Any idea on how to fix this?
>
> Johann
>   
I had the reverse pb in Breezy, now in Dapper it forks for an user on a 
fresh install. Since I had to tinker a bit in Breezy to enable it for an 
user, I guess upgrading to Dapper would have caused the same pb. I 
suspect it might be some remains of Breezy's (or most probably your own) 
configuration.

I hate the method of "reinstalling from scratch", but since upgrading 
from Hoary to Breezy, I haven't trusted upgrading too much (mostly 
because I wouldn't know how to reverse my changes nor remember exactly 
what I did).

Loïc