[cups] Documentation about CUPS usb quirks usage?

[Michael Sweet]

Johannes,

The original quirks come directly from the old usblp kernel driver.

Generally speaking, "soft-reset" is used for printers that work once but not for a second job.  "unidir" is used for printers that don't properly support back-channel data (either hung or slow printing).  And "no-reattach" is often needed for MFPs with scanner drivers.

"usb-init" is used by Gutenprint to know whether to send a USB init string.



> On Jul 2, 2015, at 8:37 AM, Johannes Meixner <jsmeix at suse.de> wrote:
> 
> 
> Hello,
> 
> is there explanatory documentation about CUPS usb quirks?
> 
> With explanatory documentation I mean in particular
> which CUPS usb quirk should help to "cure" or at least
> hide what particular USB printer issue.
> 
> Ideally I would like to have some kind of FAQ with a list
> of currently known USB printer symptoms and what CUPS
> usb quirk should usually help then.
> 
> Up to now I only know the comments in org.cups.usb-quirks
> but they do not explain when what CUPS usb quirk might help
> (also the implementation in backend/usb-libusb.c
> does not tell when what CUPS usb quirk should help).
> 
> My problem is that my own USB printers "just work" with
> the libusb-based 'usb' backend but few users report issues
> that their USB printers do not work at all or not reliable.
> 
> Because I cannot reproduce their USB printer issues
> I don't know what I could tell them which CUPS usb quirk
> might help in which case or when it is hopeless to use
> a "USB making-dots-on-paper device" as a USB printer.
> 
> 
> Kind Regards
> Johannes Meixner
> -- 
> SUSE LINUX GmbH - GF: Felix Imendoerffer, Jane Smithard,
> Dilip Upmanyu, Graham Norton - HRB 21284 (AG Nuernberg)
> 
> _______________________________________________
> cups mailing list
> cups at cups.org
> https://www.cups.org/mailman/listinfo/cups

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair