[sane-devel] SANE scanimage unable to connect to third party (backend) driver: brscan3

[Ralph Little]

Hi Don,

On Sun, Oct 5, 2025 at 6:22 AM Don Pitcher <donpitcher2000 at proton.me> wrote:

> Hello Ralph,
>
> Thank you again for helping resolve SANE not being able to find my Brother
> scanner. Adding the libusb-0.1-4 driver solved the problem when using
> Linux Mint.
>
> I am now using Fedora 42 and SANE is not able to find my Brother scanner
> (MFC-9320CW). Here is what I have done in an attempt to resolve this
> problem.
>
> Step 1) verify scanimage does not find my scanner by using the following
> command, $ sudo scanimage -L
>
> Step 2) perform $ lsusb command. This shows the computer sees my scanner.
>
> Step 3) install libusb-compat-0.1
>
> Step 4) run this command to determine if scanimage finds the brother3
> driver, $ strace scanimage -L 2>&1 | grep ".so"
>
> Step 5) since scanimage did not find the brother3 driver, I added brother3
> to /etc/sane.d/dll.conf
>
> Step 6) I then created /etc/sane.d/dll.d/brother3 file with the following
> text, usb 0x04f9 0x021c
>
> Step 7) reboot
>
> Step 8) Now the brother3 driver is shown when running the following
> command, $ strace scanimage -L 2>&1 | grep ".so"
>
> Step 9) scanimage again does not find my scanner with the following
> command, $ scanimage -L
>
> Step 10) sane-find-scanner claims a scanner is not found, but finds a
> possible scanner which has the correct vendor and product ID for my scanner.
>
> I have run out of ideas after all of these steps. Do you have any
> recommendations to resolve this problem with Fedora 42?
>
>
This sounds like a permissions issue. At the end did you try scanimage with
sudo also?

Perhaps have a look at the output of:

SANE_DEBUG_DLL=5 scanimage -L

...to see if it suggests anything.

Cheers,
Ralph
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