[PLUG] Scanner dependent on USB port

[Ken Stephens]

Permissions???

On Sun, Feb 2, 2020 at 11:47 AM Alan <alan at clueserver.org> wrote:

> On Sun, 2020-02-02 at 06:18 -0800, Rich Shepard wrote:
> > My desktop host has an Asus Prime X470-Pro motherboard and USB3.x
> > ports on
> > the rear panel plus two on the front panel.
> >
> > I have a 7-port USB3.x hub connected to one of the rear ports. The
> > external
> > backup drive, Palm TX sync/charger, and the Nokia phone charger are
> > connected to that hub. But, when I connect the Canon Canoscan LiDE
> > 400 to
> > the hub neither 'scanimage -L' nor 'sane-find-scanner' sees it.
> >
> > Connecting the scanner to a front port results is different:
> >
> > $ scanimage -L
> > device `pixma:04A91912_4301BD' is a CANON CanoScan LiDE 400 multi-
> > function peripheral
> >
> > $ sane-find-scanner
> > ...
> > found USB scanner (vendor=0x04a9 [Canon], product=0x1912 [LiDE 400])
> > at libusb:001:098
> >
> > This series of Canon scanners is now supported by sane-1.0.28 which I
> > built
> > from the source code in a clone of sane's github repo.
> >
> > I don't now know which flavor of USB3.x powers the hub and front port
> > and
> > wonder why this would make a difference in sane (and I presume xsane)
> > finding the scanner.
>
> Scanners are weird. Most/all drivers cannot be seen if they are on a
> USB hub. This includes Windows. I am not certain why. It wants the
> shortest path to the device for some reason.
>
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