Canon MP480 USB should be used in unidirectional mode

[samueldy]

On an up-do-date Manjaro Linux installation (kernel 5.12.2, manjaro 21.0.5), printing to my Canon MP480 is extremely slow and sometimes fails halfway through a page. I found this issue in the apple/cups repository about certain Canon printers being too "chatty" and needing to have bidirectional communication suppressed. The workaround suggested there:

@phizaz Many printers are "chatty" - depending on the driver in use, it may not be necessary to have back channel data at all. And a lot of Canon MP printers are already flagged as unidirectional.

Try adding a file called "/usr/share/cups/usb/canon" with the following in it:

0x04a9 unidir

If that restores proper performance, run "lsusb -v" to get the vendor and product IDs for this printer and we'll add them to the base USB "quirks" file.

has worked for my MP480 printer:

@michaelrsweet, Just wanted to say that I had this same issue for a Canon MP480, and the associated fix worked for me too. Would recommend adding this info to the quirks file, too:

  idVendor           0x04a9 Canon, Inc.                                                                                                                                                                                                                                                                                       
  idProduct          0x1731 PIXMA MP480                                                                                                                                                                                                                                                                                       
  bcdDevice            1.02                                                                                                                                                                                                                                                                                                   
  iManufacturer           1 Canon                                                                                                                                                                                                                                                                                             
  iProduct                2 MP480 series                                                                                                                                                                                                                                                                                      
  iSerial                 3 11618B                     

Can this be included in the default unidirectional flag list?