Change default printer setting to duplex

[Kevin Kofler]

Armelius Cameron wrote:
> So here are the obstacles:
> 1. I try to change printer settings from system-settings. After I change
> this in Options for the printer, and hit Apply, I get an error dialog box:
> "there was an error during the cups operation 'client-error-forbidden'"
> 
> So maybe a problem with a permission. I then did what I know: open a
> terminal, su as root, run system-config-printer, and change the settings
> there. So my question, why doesn't KDE prompt me for authentication ?

Because this has not been implemented or not been implemented properly. It's 
a bug in any case.

> 2. After doing that, I checked again under System-settings, printer
> configuration, and it seems that it reflected the changes I made. However,
> under Okular print dialog, Options, it still says: Duplex Printing: None.
> Why is this so ?

Because Qt didn't load your CUPS defaults. This should be fixed by a Qt 
patch included in our big KDE 4.4.0 update.

        Kevin Kofler