[cups] Cups usb printer discovery problems

[Michael Sweet]

Eugene,

The USB backend is not run as root. You need to make sure the USB device files can be accessed by the lp user or corresponding group for your platform.


Sent from my iPad

On Sep 9, 2014, at 5:03 AM, Eugene Prokopiev <enp at itx.ru> wrote:

>>> Run "cupsctl --debug-logging" and then look at /var/log/cups/error_log when you go to add the printer.
>> 
>> I can't see nothing interesting in error_log, so I attached it.
> 
> Sorry, previous file was wrong, so I attached another one. The
> interesting part looks like:
> 
> D [09/Sep/2014:17:31:33 +0400] [CGI] list_devices
> D [09/Sep/2014:17:31:33 +0400] [CGI] libusb_get_device_list=7
> D [09/Sep/2014:17:31:33 +0400] [CGI] Failed to open device, code: -3
> 
> It looks as permissions problem, but how can it be with root privileges?
> 
> -- 
> WBR,
> Eugene Prokopiev
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