Thank you for your response. I made the setting default to duplex print through cups printer management. Unfortunately it still prints as two single sheets even with the default and the 'print' interface window specifying duplex.

But I should not have to go to cups management or to the printer web management to set duplex on or off. This surely is done by the system through the 'print' interface. It certainly used to do that. I could print a document from LibreOffice single sided and then another duplex without having to go through any printer management. It seems to me that the appropriate settings are not being sent by the 'print' interface as appropriate to the 'print' interface completed by the user saying duplex.

It is frustrating.

ps. I use my tribal, Native American name. In English it translates to 'Go Slowly! Turtle'.

On Sun, Jul 31, 2022 at 5:32 AM Axel Braun <docb@opensuse.org> wrote:

Hello Turtle,

(BTW, Realname would be appreciated....)

Am Samstag, 30. Juli 2022, 19:53:28 CEST schrieb Go Slowly Turtle:

<snip>

> The printer is a Brother HL-2270DW. I have upgraded to the latest Brother
> drivers, created a 'new' printer to use, yet the problem persists. I tried
> printing under Windows 10, which works perfectly, so it does not look like
> a H/W problem. I have reconfigured cups and the printer using YAST. It
> still does not work correctly. I have looked in CUPS configuration files
> but found nothing I could see to be a problem.
>
> To get it to print duplex I have to go to the printer (via IP address and
> browser) to specifically set duplex mode. Then I have to unset it back
> afterwards.

I'm using basically the same setup, slightly different Brother printer.
Please go to the CUPS management page (localhost:631) select the printer ->
Management -> default settings (may be called different, I have german
installation :-)
Two-sided -> long-edge binding
-> Save

You may change this in the KDE print dialog as well, but this will not change
the default setting.

HTH
Axel