$ grep -i Nickname /etc/cups/ppd/Brother.ppd
*NickName: "Brother MFC7420 for CUPS"
*ShortNickName: "Brother MFC7420 for CUPS"
$ grep -i cupsfilter /etc/cups/ppd/Brother.ppd 
*cupsFilter: "application/vnd.cups-postscript 0 brlpdwrapperMFC7420"

Best,
Olivier

On Mon, 2017-04-10 at 18:37 +0100, Brian Potkin wrote:
> On Mon 10 Apr 2017 at 19:05:19 +0200, Olivier Aubert wrote:
> 
> > Actually, my wording was wrong: the Brother drivers do not use
> > gutenprint and gutenprint does not support the MFC7420, as far as I
> > can
> > read the source/doc.
> 
> Indeed. There is no declared support for the MFC7420.
> 
> > I just can acknowledge that the printer stopped working after
> > upgrading
> > gutenprint to 5.2.11 (with a gutenprint-related error message), and
> > that downgrading gutenprint solved the issue.
> 
> You will have a PPD in /etc/cups/ppd which gives the capabilities
> of your printer. Please post the outputs of
> 
> grep -i Nickname /etc/cups/ppd/your_ppd
> 
> and
> 
> grep -i cupsfilter /etc/cups/ppd/your_ppd
> 
> Regards,
> 
> Brian.
> 

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