Bug#983349: hplip: while scanning , error 9 : impossible to scan

[Brian Potkin <claremont102@gmail.com>]

On Mon 22 Feb 2021 at 22:17:52 +0100, alain wrote:

> Package: hplip
> Version: 3.21.2+dfsg1-1
> Followup-For: Bug #983349
> X-Debbugs-Cc: compte.perso.de-alain@bbox.fr
> 
> your command :  simple-scan escl:http://127.0.0.1:60000  was nearly ok .
> 
> simple-scan started to connect and , quickly , closed itself : "cannot connect"

That is a possible upstream  bug in SANE for this device.

> i've read your texts .
> 
> the only thing i understood is that usb connections has become now like network
> connections
> 
> alain@sid:~$ lsusb -v | grep -A 3 bInterfaceClass.*7
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
>       bInterfaceClass         7 Printer
>       bInterfaceSubClass      1 Printer
>       bInterfaceProtocol      4
>       iInterface              0
> --
>       bInterfaceClass         7 Printer
>       bInterfaceSubClass      1 Printer
>       bInterfaceProtocol      2 Bidirectional
>       iInterface              0
> --
>       bInterfaceClass         7 Printer
>       bInterfaceSubClass      1 Printer
>       bInterfaceProtocol      4
>       iInterface              0
> can't get debug descriptor: Resource temporarily unavailable
> Couldn't open device, some information will be missing
> --
>       bInterfaceClass         7 Printer
>       bInterfaceSubClass      1 Printer
>       bInterfaceProtocol      4
>       iInterface              0
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> Couldn't open device, some information will be missing
> 
> new ipp-over-usb seems to be not compatible with libsane-hpaio (my driver)

ipp-usb has taken control of the USB endpoints detailed above and
libsane-hpaio is unable to access them. This is a consquence of how 
IPP-over-USB interworks with USB. It is not a bug in either ipp-usb
or libsane-hpaio.

> so i have a big problem .
> 
> don't know the solution .

Please install sane-airscan and give

  scanimage -L

Cheers,

Brian.