According to openprinting.org the recommended driver for the HP DeskJet 540C is the hpijs driver.
So this is not a bug in foomatic-db or system-config-printer but probably a regression of the newer hplip in hardy.
Is your printer able to hold both a color an black cartridge at the same time? The 540 model can hold only one ink cartridge (black or color) and the 540C can hold both at the same time.
According to openprinting.org the recommended driver for the HP DeskJet 540C is the hpijs driver. config- printer but probably a regression of the newer hplip in hardy.
So this is not a bug in foomatic-db or system-
Is your printer able to hold both a color an black cartridge at the same time? The 540 model can hold only one ink cartridge (black or color) and the 540C can hold both at the same time.