On Wed, Jun 22, 2022, at 4:32 AM, Patrick O'Callaghan 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/
>
> 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.
>
> 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?

George might have the final answer, maybe your model will only work via a USP 
connection if using the brlaser option.

But, I checked my virtual machine to see how it is connecting to the printer...

Brother_DCP-L2550DW_series
Brother_DCP-L2550DW_series (Idle, Accepting Jobs, Not Shared)
Description:    Brother DCP-L2550DW series
Location:       
Driver: Brother DCP-L2550DW series, using brlaser v6 (grayscale, 2-sided 
printing)
Connection:     
dnssd://Brother%20DCP-L2550DW%20series._pdl-datastream._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4d12445
Defaults:       job-sheets=none, none media=na_letter_8.5x11in 
sides=two-sided-long-edge

So it does seem to be using dnssd. This is a pretty generic F36 XFCE install so 
I did not do much to get that working, mostly just needed to start cups.
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