Hello, we (i.e. openSUSE) got a special issue report
https://bugzilla.novell.com/show_bug.cgi?id=701368 A particular USB mouse model gets disabled when finding USB devices via libusb e.g. by running sane-find-scanner. There is now the question whether or not it could make sense if there was a config file for SANE where particular USB devices could be blacklisted (by idVendor and/or idProduct and/or DeviceClass and/or whatever else) so that SANE would leave such devices alone? I think in general it could make sense to avoid issues in particular exceptional cases. Details: As far as I understand what goes on (but I am not at all a USB expert) in the SANE sources the sanei_usb_init function in sanei/sanei_usb.c calls the libusb functions usb_init usb_find_busses usb_find_devices before it loops through all of the busess and all of the devices to find USB devices which are of interest for SANE: ----------------------------------------------------------------------- sanei_usb_init ... DBG (4, "sanei_usb_init: Looking for libusb devices\n"); usb_init (); #ifdef DBG_LEVEL if (DBG_LEVEL > 4) usb_set_debug (255); #endif /* DBG_LEVEL */ usb_find_busses (); usb_find_devices (); /* Check for the matching device */ for (bus = usb_get_busses (); bus; bus = bus->next) { for (dev = bus->devices; dev; dev = dev->next) { ----------------------------------------------------------------------- As far as I see SANE works basically as described in http://libusb.sourceforge.net/doc/examples-code.html If in this particular case the USB mouse gets disabled when the libusb functions usb_init usb_find_busses usb_find_devices are called, blacklisting the USB mouse in SANE cannot help because those libusb functions are not device specific. Nevertheless I think in general it could make sense to avoid issues in other exceptional cases if devices could be blacklisted in SANE. Perhaps for USB and also for SCSI in files like /etc/sane.d/sanei-usb.conf and /etc/sane.d/sanei-scsi.conf What do you think? Kind Regards Johannes Meixner -- SUSE LINUX Products GmbH -- Maxfeldstrasse 5 -- 90409 Nuernberg -- Germany HRB 16746 (AG Nuernberg) GF: Jeff Hawn, Jennifer Guild, Felix Imendoerffer