<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/3.8.1"> </HEAD> <BODY> I want to connect my scanner to laptop and use the sane library to actually scan an image. However, there seems to be a problem, i.e. scanimage and xsane are not able to startup and give this error code : scanimage: open of device gt68xx:libusb:004:012 failed: Invalid argument At the same time, following log message appears : Jan 4 10:36:41 localhost kernel: [4299192.689000] usb 4-2: USB disconnect, address 12 Jan 4 10:36:41 localhost kernel: [4299192.884000] usb 4-2: new full speed USB device using uhci_hcd and address 13 I know that the scanner (MD9459) has no onboard firmware and that a small firware file needs to be downloaded before the scanner actually is able to work. So, my guess, from the traces, is that scanimage (xsane) : -find out the usb bus/device of the scanner (4/12 in the example above) -download the firware file -disconnect the usb to kick start the firware in the scanner -try to connect to the scanner again, on the same bus/device (4/12) However, after disconnecting the scanner (3rd point above), the scanner driver (uhci_hcd?) enumerates all usb devices again, and for some reason, it gives the scanner a new device number (13). This is not known to scanimage, which still tries to access the scanner via the previous device number... and fails <IMG SRC="cid:1136367992.13042.12.camel@localhost.localdomain" ALIGN="middle" ALT=":-(" BORDER="0"> I can imagine that incrementing the device number is something from the usb spec, so the problem lies more on the sane level... Anyway, any suggestions? I'm using the latest sane, xsane, libusb drivers (did an update this morning), but the problem persists... Regards, Manuel </BODY> </HTML>