Can't print in monochrome, only in colour

[Will Cooke]

Printer is a Samsung C430W connected over wifi and using driverless printing. Everything is discovered and I can print in colour just fine.

In Bionic I was able to toggle in to monochrome, but in Disco I am not. I now have to print everything in colour.

$ lpoptions -l
PageSize/Media Size: 4x6 8.5x13.5 *A4 A5 A6 B5 Executive FanFoldGermanLegal ISOB5 Legal Letter Custom.WIDTHxHEIGHT
MediaType/Media Type: *Stationery StationeryHeavyweight StationeryLightweight StationeryBond StationeryColored Cardstock Labels Recycled Preprinted Cotton Archive
ColorModel/Print Color Mode: *RGB
cupsPrintQuality/Print Quality: *4
print-scaling/Print Scaling: *auto auto-fit fill fit none

I have also attached the output of ipptool.

[Will Cooke (willcooke)]

To add a bit of clarity, I can't *choose* to print in monochrome from and of the UI. The system print dialog shows no options to select monochrome.

[Till Kamppeter (till-kamppeter)]

Can you attach the PPD file (from /etc/cups/ppd/) of your printer of the Disco machine and if possble also the one from your Bionic machine?

[Will Cooke (willcooke)]

I tested E and that seems to work as expected.

[Till Kamppeter (till-kamppeter)]

Could you post the PPD file of Eoan then, so tat I can compare?

[Till Kamppeter (till-kamppeter)]

Could you also attach the ipptool output of Eoan, to see whether this is different?

[Till Kamppeter (till-kamppeter)]

The PPD you have now is completely different, it is not auto-generated based on a get-printer-attributes IPP request but it is a generic PPD which is part of the cups-filters package.

How did you set up your printer under Disco? How did you set it up under Eoan? Does your printer actually print under Eoan?