Thanks, Allan, I'll try that too. Of course, this computer is isolated from the internet (groan), making upgrades difficult, but not impossible!
On Wed, Nov 11, 2015 at 4:17 PM, m. allan noah <[email protected]> wrote: > You might find that a kernel and/or a sane-backends upgrade will help > that problem. There have been usb improvements in both of those places > in the past year. > > allan > > On Wed, Nov 11, 2015 at 4:49 PM, Jeremy Chacon <[email protected]> wrote: > > Hi Johannes, > > > > Thanks for your very thorough response! > > > > It turned out you were correct, it was a USB issue. The scanners that > always > > worked were connected to USB 2.0 ports, while the scanners that gave > trouble > > were always connected to USB 3.0 ports (xhci_hcd when I did lsusb). > > > > Putting all the scanners on the older port type solved the problem. > > > > Thanks very much! > > > > Best, > > > > Jeremy > > > > On Wed, Nov 11, 2015 at 2:31 AM, Johannes Meixner <[email protected]> > wrote: > >> > >> > >> Hello, > >> > >> On Nov 10 14:09 Jeremy Chacon wrote (excerpt): > >>> > >>> ... sometimes gives an I/O Error ... > >> > >> > >> In general "sometimes I/O Error" indicates that the root > >> cause is somehow hardware related where "hardware" means > >> the actual computer hardware plus the computer's built-in > >> firmware (i.e. BIOS or UEFI) and "hardware related" means > >> computer hardware plus firmware plus Linux kernel driver > >> plus low-level hardware related software (e.g. libusb). > >> You may have a look at "a stack consisting of various > >> layers must be functional in its entirety" in > >> https://en.opensuse.org/SDB:Configuring_Scanners#Basics > >> > >> You did not tell how your scanners are connected to your > >> computer. > >> > >> If your scanners are connected via USB: > >> > >> There are currently issues with USB ports where the kernel > >> module "xhci" is used as kernel driver. > >> When "lsusb -t" shows "Driver=xhci_hcd" for the USB bus > >> and port where the USB scanner is connected (see "lsusb" where > >> the scanner is connected), then there could be issues depending > >> on the computer hardware and firmware. > >> In this case see > >> https://bugzilla.opensuse.org/show_bug.cgi?id=856794 > >> in particular see > >> https://bugzilla.opensuse.org/show_bug.cgi?id=856794#c24 > >> that reads (excerpt): > >> ----------------------------------------------------------------- > >> My machine has 4 USB ports, two labeled with > >> the "super speed" USB logo (a.k.a. USB 3) and > >> two labeled with the normal USB logo (a.k.a. USB 2) > >> but for all 4 ports xhci is used and it fails on all 4 ports. > >> ----------------------------------------------------------------- > >> and see > >> https://bugzilla.opensuse.org/show_bug.cgi?id=856794#c40 > >> > >> When your scanner is not connected at a USB port where the > >> kernel module xhci_hcd is used as kernel driver (e.g. when > >> your scanner is connected at a USB port where the kernel > >> module uhci_hcd or ehci_hcd is used as kernel driver), > >> then have a look at "Trouble-Shooting (Debugging)" in > >> https://en.opensuse.org/SDB:Configuring_Scanners > >> > >> For example in your case to get USB debugging information > >> you could use comands (as root) like > >> ----------------------------------------------------------------- > >> export SANE_DEBUG_SANEI_USB=128 > >> scanimage -L > >> unset SANE_DEBUG_SANEI_USB > >> ----------------------------------------------------------------- > >> > >> > >> Kind Regards > >> Johannes Meixner > >> -- > >> SUSE LINUX GmbH - GF: Felix Imendoerffer, Jane Smithard, > >> Graham Norton - HRB 21284 (AG Nuernberg) > >> > >> > >> -- > >> sane-devel mailing list: [email protected] > >> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel > >> Unsubscribe: Send mail with subject "unsubscribe your_password" > >> to [email protected] > > > > > > > > > > -- > > > ___________________________________________________________________________ > > > > Jeremy M. Chacon, Ph.D. > > > > Post-Doctoral Associate, Harcombe Lab > > University of Minnesota > > Ecology, Evolution and Behavior > > > > > > -- > > sane-devel mailing list: [email protected] > > http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel > > Unsubscribe: Send mail with subject "unsubscribe your_password" > > to [email protected] > > > > -- > "well, I stand up next to a mountain- and I chop it down with the edge > of my hand" > -- *___________________________________________________________________________Jeremy M. Chacon, Ph.D.* *Post-Doctoral Associate, Harcombe Lab* *University of Minnesota* *Ecology, Evolution and Behavior*
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