Arch Linux

MAC!EK

Member

Registered: 2005-09-27

Posts: 267

All usb devices belong to camera group

I wanted to use my scanner, I could see it in sane-find-scanner:

<cut>
found USB scanner (vendor=0x055f, product=0x021a [USB Scanner], chip=GT-6816?) at libusb:001:005
<cut>

but scanimage doesn't :

$ scanimage -L      
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

but it does from root account:

# scanimage -L
device `gt68xx:libusb:001:005' is a Mustek BearPaw 2448 TA Plus flatbed scanner

I started invastigating and discovered that all USB devices belong to camera group:

$ ls -lR /dev/bus/
/dev/bus/:
razem 0
drwxr-xr-x 7 root root 0 paź 29  2007 usb

/dev/bus/usb:
razem 0
drwxr-xr-x 2 root root 0 paź 29 12:16 001
drwxr-xr-x 2 root root 0 paź 29  2007 002
drwxr-xr-x 2 root root 0 paź 29  2007 003
drwxr-xr-x 2 root root 0 paź 29  2007 004
drwxr-xr-x 2 root root 0 paź 29  2007 005

/dev/bus/usb/001:
razem 0
crw-rw-r-- 1 root camera 189, 0 paź 29 12:16 001
crw-rw-r-- 1 root camera 189, 4 paź 29 12:20 005

/dev/bus/usb/002:
razem 0
crw-rw-r-- 1 root camera 189, 128 paź 29 12:16 001
crw-rw-r-- 1 root camera 189, 129 paź 29 12:16 002

/dev/bus/usb/003:
razem 0
crw-rw-r-- 1 root camera 189, 256 paź 29 12:16 001

/dev/bus/usb/004:
razem 0
crw-rw-r-- 1 root camera 189, 384 paź 29 12:16 001

/dev/bus/usb/005:
razem 0
crw-rw-r-- 1 root camera 189, 512 paź 29 12:16 001

I added my user to camera group also (my user was a member of scanner group before) and scanner started to work.

But why all USB devices are owned by camera group?

MAC!EK

Member

Registered: 2005-09-27

Posts: 267

Re: All usb devices belong to camera group

I renamed /etc/udev/rules.d/53-sane.rules to 55-sane.rules so it's starting after 54-gphoto.rules and now one of /dev/bus/usb/ files has root:scanner owning.