Bug#995322: closed by Brian Potkin <claremont102@gmail.com> (Re: Bug#995322: ipp-usb: prevents hp-toolbox and libsane-hpaio from working)
On Wed, 29 Sep 2021, Debian Bug Tracking System wrote:
#995322: ipp-usb: prevents hp-toolbox and libsane-hpaio from working
It has been closed by Brian Potkin <claremont102@gmail.com>.
Much of your time would have been saved by reading the Release
Notes. Please submit another report if you feel the documentation
is inadequate.
Indeed it is. As I said, ipp-usb got automatically installed upon upgrading
to bullseye, together with tons of other packages. The only piece of
information I was shown was the NEWS.Debian file of ipp-usb (together with
dozens of other messages). The only thing it says is
"Existing or newly created queues on a USB connection for IPP-over-USB
capable devices using vendor drivers will not work while the ipp-usb
service is activated and managing the connection."
This is only about printing, no clue about other functions of the same
device. Only _after_ discovering that ipp-usb was preventing xsane to
connect to the scanner I looked at
https://wiki.debian.org/CUPSDriverlessPrinting
and found this warning in there:
"Note that IPP-over-USB reserves the USB interface connection with the
printer/scanner exclusively for itself and communication with a
printer/scanner device by software that does not operate using the
IPP-over-USB protocol becomes impossible while ipp-usb is running. This is
a consequence of the design of USB communication. It is not a bug in
ipp-usb. (omissis) Communicating with a USB connected scanner via classic
SANE backends such as libsane-hpaio, sane-pixma or sane-epson2 also becomes
impossible with the ipp-usb daemon active and running."
Had I seen _this_ warning in the release notes, _then_ this would have got
some alarm ringing and I would not have wasted hours tracking this.
So, please: do include the above warning, in full, in the release notes of
ipp-usb.
Also, it would be helpful to add at least a "Suggests" to install
also the package sane-airscan along with it, since this will restore most
multifunction devices to properly work again as scanners when ipp-usb is
running.
Thanks, and sorry for the inconvenience.
Bye
Giacomo
--
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Giacomo Mulas <giacomo.mulas@inaf.it>
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