[sane-devel] Fwd: CanoScan LiDE 220... on a Raspberry Pi.

[Mark DM]

Do both systems show the same USB ID for the scanner? If not you need to
use a tool that sets the mode of the USB device I believe it is called USB
Modeswitch.

Some devices rely on this to change the "personality" of the device by
changing the USB ID . This is commonly used in 3G USB dongles but I once
saw it used on something else.

On Mon, May 20, 2019 at 7:03 PM Kelly Price <strredwolf at gmail.com> wrote:

> Well, here's the other side.  When I used scanimage on the Pi
> "locally" it works.  But when I (supposedly) set up saned on it and
> then use xsane on my PC... it fails with the "invalid argument" error.
>
>
> On Mon, May 20, 2019 at 3:33 AM Johannes Meixner <jsmeix at suse.de> wrote:
> >
> >
> > Hello
> >
> > On May 18 19:37 Kelly Price wrote (excerpt):
> > > * First connected to a Pi 3B+: failed with same error as USB 3.0 over
> xhci.
> > > * Connected to a Chromebook with USB 2.0 ports over ehci: works 100%
> with xsane
> > > * Connected to a Pi 2B: works 100% with scanimage
> > > * Connected back to the Pi 3B+:  now works 100% with scanimage
> > >
> > > Maybe some initiation has to happen over ehci for it all to work
> > > properly.  Weird.
> >
> > Interesting finding!
> >
> > I guess your USB scanner has its own power supply
> > (some USB scanners get power via USB only)
> > and you kept it connected to its power supply
> > while you exchanged its USB connection to the
> > above listed computers?
> >
> > In this case I also think some specific initiation
> > inside the scanner has to happen to make it work.
> >
> > Or did you also disconnect your USB scanner from its
> > power supply so that it was completely switched off
> > each time when you exchanged its USB connection?
> >
> > I am neither a USB expert nor do I use a Raspberry Pi
> > but I am interested what the root cause could be
> > why sometimes some scanners don't work with xhci_hcd,
> > cf.
> > https://en.opensuse.org/SDB:Configuring_Scanners#USB
> > and
> >
> https://alioth-lists.debian.net/pipermail/sane-devel/2019-January/036525.html
> > and more like that...
> >
> >
> > Kind Regards
> > Johannes Meixner
> > --
> > SUSE LINUX GmbH - HRB 21284 (AG Nuernberg)
> > GF: Felix Imendoerffer, Mary Higgins, Sri Rasiah
> >
> >
> > --
> > sane-devel mailing list: sane-devel at alioth-lists.debian.net
> > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/sane-devel
> > Unsubscribe: Send mail with subject "unsubscribe your_password"
> >              to sane-devel-request at lists.alioth.debian.org
>
>
>
> --
> Kelly "STrRedWolf" Price
> http://redwolf.ws
>
> --
> sane-devel mailing list: sane-devel at alioth-lists.debian.net
> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/sane-devel
> Unsubscribe: Send mail with subject "unsubscribe your_password"
>              to sane-devel-request at lists.alioth.debian.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://alioth-lists.debian.net/pipermail/sane-devel/attachments/20190526/02acd9a7/attachment.html>