[cups.general] Unable to print to USB

[Tim Waugh]

On Wed, 2010-02-24 at 10:48 +0100, Johannes Meixner wrote:
> If I remember correctly, the "hp" backend implements
> the 1284.4/MLC channel which is used both for printing
> and scanning - but I am really no expert here.

In fact it is implemented using libhpmud, used by both the hp backend
(just for printing) and by the SANE backend (for scanning).

> Therefore - as far as I understand it - even if the HPLIP filter
> would use the CUPS back-channel for printer status info, it would
> not work to use the generic CUPS "usb" backend for printing
> while the hpaio SANE driver can still be used for scanning.

You can use the usb backend to print to HP multifunction printers.

You cannot scan while printing even if you are using the hp backend.

Tim.
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