sane does not work as saned but as root it does

I have a plug computer that I want to use as scanner server using sane. It already worked with a different plug, so I know for sure that the scanner and sane are workable together. If I issue scanimage -L as root I get this output: device `hpaio:/usb/Deskjet_F300_series?serial=CN73CGJ05504KH' is a Hewlett-Packard Deskjet_F300_series all-in-one which is what I am expecting, but when I call the command as saned I get this output: No scanners were identified. [...] If I call sane-find-scanner as saned it brings up: found USB scanner (vendor=0x03f0, product=0x5511) at libusb:001:015 Now the interesting part is that the vendor and product is not detected here, but when I do the same as root this is the result: found USB scanner (vendor=0x03f0 [HP], product=0x5511 [Deskjet F300 series]) at libusb:001:015 So, somehow the root user has access to the list of vendors (and thus is able to detect the scanner) while saned is not. I don't want to run the saned server as root so I need to figure this out. All settings I did in saned.conf are for the network interaction, but my problem is on the local host, so I skip the config file (but of course can provide it if necessary) saned groups: saned scanner I assume that I need to change the privileges of the file where vendor and product are mapped (/etc/sane.d/hp.conf), but that is already readable by sane. -rw-r--r-- 1 saned scanner 396 Dec 12 2010 hp3900.conf -rw-r--r-- 1 saned scanner 76 Dec 12 2010 hp4200.conf -rw-r--r-- 1 saned scanner 238 Dec 12 2010 hp5400.conf -rw-r--r-- 1 saned scanner 497 Dec 12 2010 hp.conf -rw-r--r-- 1 saned scanner 22 Dec 12 2010 hpsj5s.conf Same for /etc/sane.d/dll.d/ -rw-r--r-- 1 saned scanner 38 Dec 10 2013 hplip Interesting is that neither of these files contain the Deskjet_F300_series information, so maybe there is another file? Also, while the scanner does have a printing option, I'm not interested in this. I did read [this post](https://unix.stackexchange.com/q/184367/54677) , but I would prefer not to do what is described there, because somewhere the information is already present and I would like to access that place, from the saned user.