[sane-devel] Fast fi-65F slow with SANE

[Felix E. Klee]

The Fujitsu fi-65F can scan an A6 page in just one second.  This works
as advertised with the included “PaperStream Capture”.  It even works
when using SANE, except that before each scan there is a delay of almost
ten (!) seconds:

    $ cat /etc/lsb-release
    LSB_VERSION=1.4
    DISTRIB_ID=Arch
    DISTRIB_RELEASE=rolling
    DISTRIB_DESCRIPTION="Arch Linux"
    $ uname -a
    Linux felix-arch 5.16.4-arch1-1 #1 SMP PREEMPT Sat, 29 Jan 2022
    19:08:13 +0000 x86_64 GNU/Linux
    $ scanimage --version
    scanimage (sane-backends) 1.1.1; backend version 1.1.1
    $ scanimage -L
    device `epjitsu:libusb:003:006' is a FUJITSU fi-65F  0A01 scanner
    $ scanimage -o out.png --resolution 200dpi

*Why the delay?*

I also tried with `SANE_DEBUG_EPJITSU=255 scanimage`, but that didn’t
tell me anything: During the delay there is no output.