Hello! It drove me almost insane to try and debug SANE over the Weekend, but today I downgraded from udev / libudev1 221-1 to 215-17+deb8u1 and suddenly my flatbed scanner started to work again. No other changes whatsoever, using current SANE from testing, i.e. 1.0.24-13. The sole SANE backend used is "snapscan", driving the "EPSON Perfection 3490 Photo" which has (vendor=0x04b8 [EPSON], product=0x0122 [EPSON Scanner]) at libusb:008:004 according to sane-find-scanner. With current udev, this tool still finds the device (it merely scans the USB bus and reports everything advertising to be a scanner!), but SANE completely fails to recognize it, i.e. "scanimage -L" yields no results whatsoever for udev from testing, but works just fine with udev from stable.
The scanner needs a firmware file to be uploaded which is handled by the SANE snapscan backend, but merely downgrading udev suggests it may be a permission issue or whatever else on the device end. Downside is that it is pretty hard to tell where down the road exactly it stopped working since I don't use it often enough. The other downside ist that right now I have no way to tell how it fails. I would need to pass debugging options to the saned daemon, but the older rc.d thing does not seem to do the trick any longer and there were no clues from the daemon in any of the log files so far. Question is if saned would treat the absence of any scanner as an error at all, so even passing debug options to saned may not get us any further. Hope this information is still of use to you. At least I would be happy to do further debugging and testing if time permits and provided you can tell me what would be of help to you and what to look for. I can at least switch back and forth between stable and testing without assistance if need be, i.e. in order to check certain permissions or whatever else might go wrong. Kind Regards, Dirk Ritter _______________________________________________ Pkg-systemd-maintainers mailing list Pkg-systemd-maintainers@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-systemd-maintainers