On Wed, Jun 22, 2022 at 8:32 AM Patrick O'Callaghan <pocallaghan@gmail.com> wrote:
(See ... for context)

I have a Brother All-in-one wireless laser printer/scanner which has
worked for years using the manufacturer's driver blob. I now want to
configure it using the printer-driver-brlaser package from the Fedora
repo.

I've uninstalled the original Brother driver and deleted the printer
config using the CUPS interface.

I then added a new printer using the KDE System Settings widget, and
attempted to print a test page. This appears to go through, but then
the queue status shows "Unable to locate printer".

I deleted that configuration and tried again using the CUPS web
interface. This shows up as:

dnssd://Brother%20DCP-7055W._ipp._tcp.local/

I suspect this detection doesn't adequately check the details of the
IPP support.  Given the age of the printer, IPP may not be implemented
"properly" by current standards.


Printing a test page again shows "Unable to locate printer". This
happens both using the generic IPP driver and the specific model driver
from the RPM package.

I looked at the Brother DCP-7055W Advanced User's Guide, which is dated
2012.   I can't see any mention of IPP or AirPrint.  

https://discussions.apple.com/thread/7199902 says this model was not
on Apple's list of supported printers for AirPort in 2015.

 https://wiki.gentoo.org/wiki/Brother_networked_printer says the printer
works, but gives no configuration details

https://www.pwg.org/ipp/ippguide.html tells you to "Consult your Printer documentation
or the Printer's Bonjour (DNS-SD) registration information to determine the proper hostname,
port number, and path to use for your Printer."   It would be interesting to know why
IPP is failing, but I suspect you are stuck with Brother's rpm.


The CUPS systemd service and AVAHI daemon are both running, as is
systemd-resolved, which handles DNS-SD (I reloaded the latter just in
case.)

I'm out of ideas. To repeat: both printing and scanning work correctly
with the manufacturer's driver, so it's not a hardware or connection
problem.

Any thoughts before I give up and revert to the binary blob?

poc
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