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

[Kelly Price]

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
>
>
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-- 
Kelly "STrRedWolf" Price
http://redwolf.ws