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 <[email protected]> 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: [email protected] > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/sane-devel > Unsubscribe: Send mail with subject "unsubscribe your_password" > to [email protected] -- Kelly "STrRedWolf" Price http://redwolf.ws -- sane-devel mailing list: [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to [email protected]
