[sane-devel] Fwd: CanoScan LiDE 220... on a Raspberry Pi.
markosjal at gmail.com
Sun May 26 19:31:45 BST 2019
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
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
> > > * 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
> > and more like that...
> > Kind Regards
> > Johannes Meixner
> > --
> > SUSE LINUX GmbH - HRB 21284 (AG Nuernberg)
> > GF: Felix Imendoerffer, Mary Higgins, Sri Rasiah
> > --
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> Kelly "STrRedWolf" Price
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