From owner-freebsd-ports@freebsd.org  Fri Mar 18 09:37:28 2016
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Date: Fri, 18 Mar 2016 10:35:57 +0100
From: Tijl Coosemans <tijl@FreeBSD.org>
To: Thomas Gellekum <thomas.gellekum@netaachen.de>
Cc: Jonathan Chen <jonc@chen.org.nz>, freebsd-ports@freebsd.org
Subject: Re: USB devices and the latest update to CUPS
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On Fri, 18 Mar 2016 09:40:01 +0100 Thomas Gellekum <thomas.gellekum@netaachen.de> wrote:
> On 03/18/2016 07:14, Jonathan Chen wrote:
>> Ever since the latest update to CUPS, jobs sent attached to my USB
>> printer are stuck with:
>> 
>> D [18/Mar/2016:17:01:05 +1300] [Job 407] libusb_get_device_list=1
>> I [18/Mar/2016:17:01:05 +1300] [Job 407] Waiting for printer to become
>> available.
>> 
>> This will loop indefinitely, with the printer never coming available.
>> 
>> If I stop CUPS and directly cat(1) a file to /dev/unlpt0, output will
>> appear; so it's nothing to do with the USB connection to the printer.
>> 
>> Anyone else seeing this?  
> 
> Yes. I also noticed that the LIBUSB was dropped (unset in my case).

Please see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207939