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Re: 4 printer limit to cups printers is a debian limit, why?

On Monday 12 February 2018 17:25:01 Brian wrote:

> On Mon 12 Feb 2018 at 15:52:15 -0500, Gene Heskett wrote:
> > On Monday 12 February 2018 14:09:49 Brian wrote:
> > > On Mon 12 Feb 2018 at 13:50:31 -0500, Gene Heskett wrote:
> > > > Greetings all;
> > > >
> > > > I have 2 physical printers, a bottom of the line B&W laser that
> > > > manages to do utility print jobs at 19 ppm, and a huge ink
> > > > squirter with more bells and whistles than you can shake a stick
> > > > at.
> > > >
> > > > To do all of the job profiles this Brother MFC-J6920DW is
> > > > capable of, because among the various paper sizes it can handle
> > > > is borderless tabloid, aka 11x17. Its scanner can also handle
> > > > that size when the doc feeder is lifted and its laid directly on
> > > > the glass, but that is not germain to this problem.
> > > >
> > > > Do adequately describe the various jobs it can do, by selecting
> > > > the "printer" to send this job to, would need at least 8,
> > > > individual profiles setup in the cups menu's at
> > > > localhost:631/printers.
> > > >
> > > > I have discussed this with Micheal Sweet, whom I've known longer
> > > > than linux has existed, and he assures me there is no such limit
> > > > in cups, never has been. Ever.
> > > >
> > > > So where is this limit, so that I can raise it to a dozen or so,
> > > > and get on with what I want to do?
> > >
> > > I assure you there is no limit of four print queues enforced  on
> > > Debian. Never has been. Ever.
> >
> > There is one someplace. I just read thru everything in /etc/cups*
> > without finding a hint.  Then I read thru all the brother install
> > scripts, again coming up blank. That was a 3 hour slog right there.
> Let's be very clear about this: there is no "someplace". As delivered
> to you, the Debian printing system allows a user to set up as many
> print queues as he wants. There is no deviation from upstream in any
> of the packages in this regard.
> > I wonder if I can change its name, like from MFC-J69220DW to
> > MFC-J6920DX (or Z)but forcibly use the same driver? Got to be some
> > way to get around this. Time for a better mousetrap perhaps?
> Different queues have different names. It is not possible to have more
> than one queue with the same name. Different queues can have a device
> URI and PPD in common, however.

So, the next time I need to setup a photo profile, using the glossy paper 
in the top tray, I should change the name, not just the description, yet 
use the same ppd, and change its defaults to whatever it needs to do 
decent photo reproductions. I had it setup to do a faint, washed out 
photo, but lost that when I tried to add the tabloid format this morning 
because I've been considering doing a rockhopper diagram of all my 
machines as what I did a year ago is now so obsolete as to be worthless 
should I need to run down a configuration bug.  Unfortunately, the 
rockhopper output is in vector gfx, and to magnify it to usable by 
magnifying it to where the individual block of hal logic is big enough 
to read its label, the whole thing is going to be 8 to 12 tabloid sheets 
pasted up into a wall sized image.  Sure, it can be looked at by 
firefox, but firefoxes magnification limit by pressing ctrl+ is about 
100x too small. We can do it in inkscape but it spends 99% of its time 
in swap, so the scanning speed is like watching grass grow.

You would be amazed at how a 700 loc hal file is displayed. Rockhopper 
analyses a running instance, so paths that are gingerbread, skipped, 
don't even show up. So unless you've got a reason for that code, it can 
be hunted down and elided. It can indirectly indicate out of sequence 
stuff that can be doing odd stuff to the latency of active data too. In 
fact there have been times when I have actively made use of that effect 
for a noise averaging filter. Rockhopper doesn't actually put a WTF 
label on such construct but will show it clear enough to surprise the 
reader.  Its an excellent troubleshooting tool.

Whats needed for its output on paper, is a tabloid sized binder that is 
affordable. That does not exist at our local Staples for any price. 
Trying to fold it up with all the scotch tape pasting it together is, 
shall we say "frustrating", and where do you store a 4x8 foot sheet of 
1/8th panel its taped to in a crowded 14x24 garage setting? I'm still 
looking for an answer to that question. Something I did not consider in 
2008 when I built that garage with 4 or 5 hours worth of help from the 
next door neighbor laying shingles. I returned the favor the next year 
when he did one of his own.

Got it, but try it with an existing profile first. Get the "competition" 
out of the picture IOW.

Thanks. When I do it, I'll advise how it worked.
Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>