Many thanks for your explanations. Rolf
Am 20.03.20 um 12:38 schrieb Till Kamppeter: > On 20/03/2020 12:29, Thierry HUCAHRD wrote: >> Hi, >> No, this has nothing to do with eSCL. >> ippusbxd allows you to use escl backends on the usb. >> The problem is that sane doesn't detect the scanner on the usb >> anymore, so PIXMA can't be used anymore. >> I don't know if ippusbxd solved the problem? >> in any case if the device has a usb driver, ippusbxd is not necessary! > > On the other side if you have ippusbxd or ipp-usb running you do not > need one of the device-specific USB drivers like pixma, as > IPP-over-USB is designed for driverless operation of multi-function > devices and so every device which supports IPP-over-USB also supports > printing and scanning using manufacturer-independent standards, for > scanning currenly usually eSCL. So with an IPP-over-USB daemon > (ippusbxd or ipp-usb) running you are supposed to scan with an eSCL > backend (escl or airscan). This way multi-function devices which are > not from HP (HPLIP) or from Canon (pixma) scan with free software. > > Till > >