[cups] Please help debugging - Brother MFC2710DW stopped printing

Hi,

I have trouble printing to my Brother MFC 2710 DW. It used to work, then 
it printed multiple empty pages, and since a couple of days it just does 
nothing. Here are the details:

  * cups version 2.2.10-6+deb10u3 on Linux (Debian buster)
  * Scanning via USB connection works, I have installed the proprietary
    brscan stuff. I could not, however, find any proprietary printer
    driver package that could be installed (only an i386 package, but
    this is amd64)
  * this installed stuff in /opt. There is also a ppd file for the
    printer in /opt, but it has not been installed with dpkg (probably
    with the installer script?)
  * I have removed all instances of the printer, and then used the "Find
    new printer" ("Neue Drucker suchen", actually) dialog to re-add it.
    I chose the "Driver"
    Brother MFC-L2710DW series, driverless, cups-filters 1.21.6
  * The "find new printer" dialog found actually three instances, one is
    on USB:

    # grep -B1 DeviceURI /etc/cups/printers.conf
    MakeModel Brother MFC-L2710DW series, driverless, cups-filters 1.21.6
    DeviceURI
    dnssd://Brother%20MFC-L2710DW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af45ce1b4
    --
    MakeModel Brother MFC-L2710DW series, driverless, cups-filters 1.21.6
    DeviceURI ipp://BRW5CEA1DA1299E.local:631/ipp/print
    --
    MakeModel Brother MFC-L2710DW series, driverless, cups-filters 1.21.6
    DeviceURI usb://Brother/MFC-L2710DW%20series?serial=E78295E8N123413
  * When I try to print a test page, it does just "nothing".
  * I set "LogLevel debug" in cupsd.conf, but this gives so much
    information that I need help. There is one thing that looks weird to me:

D [09/Oct/2020:17:54:36 +0200] [CGI] cgiSetArray: 
printer_make_and_model[2]=\"Brother MFC-L2710DW series, driverless\
, cups-filters 1.21.6\"
D [09/Oct/2020:17:54:36 +0200] [CGI] cgiSetVariable: THISURL=\"/printers/\"
D [09/Oct/2020:17:54:36 +0200] [Client 149] CGI data ready to be sent.
D [09/Oct/2020:17:54:36 +0200] [Client 150] HTTP_STATE_WAITING Closing 
for error 32 (Broken pipe)
D [09/Oct/2020:17:54:36 +0200] [Client 150] Closing connection.
D [09/Oct/2020:17:54:36 +0200] cupsdSetBusyState: newbusy="Active 
clients", busy="Active clients"
D [09/Oct/2020:17:54:36 +0200] [Client 149] con->http=0x56332e723a00
D [09/Oct/2020:17:54:36 +0200] [Client 149] cupsdWriteClient error=0, 
used=0, state=HTTP_STATE_GET_SEND, data_encodi\
ng=HTTP_ENCODING_CHUNKED, data_remaining=0, response=(nil)(), 
pipe_pid=30887, file=13
D [09/Oct/2020:17:54:36 +0200] [Client 149] Waiting for CGI data.

A broken pipe looks bad.

Further information:

  * The printer works fine from a MacBook
  * there are similar problems from an Ubuntu PC
  * relevant parts of the cups error log are attached.

Any help is appreciated!

Kind Regards and TIA, Frank

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