Printing Orientation Issue

[jbergen]

After months and months of trying everything I could possibly think of, I finally solved this printing issue on my Linux computer.

I actually had three printing issues:

1) This one, where QCAD always prints in portrait when it's supposed to print in Landscape.
2) Double-sided prints from OnlyOffice always print single-sided.
3) Printing a quantity of more than one only printed one copy.

I am using QCAD/CAM 3.31.2.0, a networked HP Color LaserJet PRO MFP M281cdw, a Lenovo ThinkPad E16 (Intel), and LMDE7.

I tried numerous Distros and numerous Printer Settings and here is what I found:

In Print Settings app there is a "Device URI" setting which handles communication with the printer, and a "Make and Model" setting for the printer driver.

Linux auto-detects my printer and defaults to "implicitclass" for the URI and "driverless" for the driver.

With this default setup, I had all 3 of the problems listed above.

Changing the "Device URI" from "implicitclass" to something else eliminates problem 2.
Changing the "Make and Model" from "driverless" to a driver for my specific printer eliminates problem 3.

But those changes do not solve problem 1. QCAD still prints in portrait mode.

After trying countless different Distros with the same results, I finally found a combo that works:

1) Debian 13 Trixie (KDE and Cinnamon both worked). I am currently using LMDE7 which is based on Debian 13 Trixie.
2) A generic driver. Instead of the driver for my HP M281, I used the generic "HP Color Laserjet - Series PCL 6 CUPS" driver.

This is the only combo that has solved all 3 problems for me.

I don't think this is a problem with QCAD. I think it's a problem with CUPS and/or the printer drivers supplied with most Linux distros.