I have Sid with KDE 3.0.4, CUPS, and lp, printing to a Deskjet 1120c
I've noticed a couple of problems, possibly related.
(1) When I go to Preferences | System | Printing Manager, and click on my HP Deskjet printer, then click on "Instances", and then click on one of the instances, and finally "settings" possible setups, I cannot edit the parameters of the settings. It ignores the click. The only time I can edit this is right after I have created it as a new instance. Therefore, to edit I have to go to the instance, delete it, and then create a new one.
(2) My instances seem to regularly corrupt. Essentially, the Deskjet 1120c can handle 600 dpi greyscale, or 300 dpi color. If I try to print at 600 dpi color, then I get a junk page. So far, so good -- I set my instances accordingly. But every so often, almost regularly, my 600 dpi greyscale setting corrupts to 600 dpi color, producing junk. I then have to go and delete the instance, etc., etc., etc.

