CUPS, USB printers & "Permission Denied"

> I just tried /dev/unltp0 and I have the same issues.
Basically, I
> killed all of the jobs, made your change, submitted a
test page,
> watched as nothing happened (it didn't display any
messages in the web
> interface), did a /usr/local/etc/rc.d/cupsd restart,
killed the test
> page, then resubmitted one, and then it mentioned the
USB busy will
> retry in 30 seconds line. I reattached my error_log for
today's
> activities.
>
> I will be on the road for the better part of a week, so
I will try to
> help out as much as I can given the circumstances.
Thank you everyone
> for your assistance with this.
>

I found that the usb backend stalled here before actually
doing any
work. Before I've done any actual debugging of the backend,
I suspect
that it is being blocked on a status read attempt, though
this is only
my current guess.

Here is a workaround:

In printers.conf () you will probably find a line like this:

DeviceURI usb:/dev/ulpt0

change usb: to file:, so that it looks something like this:

DeviceURI file:/dev/ulpt0

Then restart cups. Cups will not read any status information
from the
printer, but at least it can print. Be warned about unknown
side effects. 

Jan-Espen Pettersen

>
> I found that the usb backend stalled here before
actually doing any
> work. Before I've done any actual debugging of the
backend, I suspect
> that it is being blocked on a status read attempt,
though this is only
> my current guess.
>
> Here is a workaround:
>
> In printers.conf () you will probably find a line like
this:
>
> DeviceURI usb:/dev/ulpt0
>
> change usb: to file:, so that it looks something like
this:
>
> DeviceURI file:/dev/ulpt0
>
> Then restart cups. Cups will not read any status
information from the
> printer, but at least it can print. Be warned about
unknown side effects.
> 
>
> Jan-Espen Pettersen

Thanks, that did fix the problem! I'll be adding your hint
to the PR/99460.

Nicolas.
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