Thanks for your bug report, more information is needed.
The printingbug info script shows:
device for DeskJet-940C: hp:/no_device_found
Are you sure your printer was powered on when running the
printingbuginfo script?
If this was not the case it is enough to power on your printer and provide the
output of the following command:
$ lpstat -v
> The problem was that by using: System -> Administration -> Printing
> menu to go in and change the printer properties, in this case default
> print type from normal to normal grayscale would have no effect in
> the printer's ppd file or anywhere else for that matter.
Printer settings made in gnome-cups-manager are saved in ~/.cups/lpoptions and
NOT to /etc/cups/ppd/printer.ppd
Do changes in gnome-cups-manager reflect in ~/.cups/lpoptions ?
>From which application did you try to print in grayscale?
Please use the unaltered PPD again (*DefaultPrintoutMode: Normal) with
Normal.Gray option set in gnome-cups-manager and try if you have the same
result when printing from openoffice and gedit?
** Changed in: gnome-cups-manager (Ubuntu)
Assignee: (unassigned) => Pascal De Vuyst
Status: Unconfirmed => Needs Info
--
changing settings (like paper size) have no effect in CUPS
https://launchpad.net/bugs/92266
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