Subject: printer-driver-pxljr: Loss of duplex on Dell 2130cn with pxlcolor Sometime since buster, but probably bullseye, my Dell 2130cn stopped printing in duplex. I don't use the printer much and I upgraded from buster to bullseye to bookworm in fairly quick order, so I don't recall if I ever tried printing in bullseye.
I have had the same problem with a FujiXerox Docucentre SC2020. Being a little new, I have been trying to understand the bug reporting system to make a coherent submission, but will add these notes here. Please tell me if this is the wrong way to go about it. I'm also not sure what the relevant package is, if it is this one or some other.
The SC2020 will print duplex from Ubuntu 18.04.6 LTS and from Raspbian GNU/Linux 10 (buster). It is not the PPD file changing, because copying the working pxlcolor.ppd from those machines makes no difference.
I changed to debian bookworm after the previous machine died, so this is a fresh install.
One point I have noticed, that may or may not be relevant, is that the printer seems to receive a duplex command of some sort: on the printer's LCD display, when looking at the details of a duplex job, it shows "two-sided" even though it only prints on one side.
Another possibly irrelevant point is that this is over ethernet, and the problem persists whether it is IPP, socket 9100, or LPD.
I have also tried
'Generic PCL 6/PCL XL Printer Foomatic/pxlcolor (recommended)'
and
'Generic PCL Color Laser - CUPS+Gutenprint v5.3.4'
and some others, in a fit of confusion, as drivers; these also fail to
print duplex.