[sane-devel] plustek backend failing to open device under non-root

[m. allan noah]

Will depend on your linux distro, some use hal instead of udev rules,
or some other thing. It is best to ask on a distro-specific forum just
how your particular distro version manages device permissions.

allan

On Thu, Sep 10, 2015 at 3:40 PM, Yury Tarasievich
<yury.tarasievich at gmail.com> wrote:
> I'm having an issue of plustek backend (sane-backends-git20150807) failing
> to open the device under a non-root account. Can't use scanimage, can't use
> xsane. Scanning under root works fine.
>
>
> The account is added to `scanner` group. Sane udev rules in
> /etc/udev/rules.d mention `scanner` group.
>
> However, strangely, when Canon LIDE 25 is plugged in, the device node is
> created with group owner `lp` and mode 664, however. Can't find the reason.
> The account is in group `lp`, too.
>
> Ultimately, when trying to do scanimage on specific device, like
>
> env SANE_DEBUG_DLL=255 SANE_DEBUG_PLUSTEK=255 scanimage -d
> plustek:/dev/bus/usb/001/006
>
> right now, I'm getting this
>
> ...
> [plustek] usbDev_open(auto,) - 0x157b040
> [plustek] sanei_access_lock failed: 11
> [plustek] open failed: -1
> [dll] init: backend `plustek' is version 1.0.0
> [plustek] sane_open - /dev/bus/usb/001/006
> [plustek] attach (/dev/bus/usb/001/006, 0x7fff95e05960, 0x7fff95e058c8)
> [plustek] Device configuration:
> ...
>
> and subsequently this
>
> ...
> [plustek] usbDev_open(/dev/bus/usb/001/006,) - 0x157b040
> [plustek] No supported device found!
> [plustek] open failed: -1
> scanimage: open of device plustek:/dev/bus/usb/001/006 failed: Error during
> device I/O
> ...
>
> Could anybody advise, please?
>
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