Hi, > When I power up the scanner, I get pretty much the same behavior I > was getting before, although maybe slightly improved. The scanner > seems to be resetting every second or so... in dmesg I get a series > of messages like this: > > [4352427.799000] usb 5-7: new high speed USB device using ehci_hcd > and address 63 > [4352428.131000] usb 5-7: USB disconnect, address 63 > [4352428.300000] usb 5-7: new high speed USB device using ehci_hcd > and address 64 > [4352428.631000] usb 5-7: USB disconnect, address 64 > > which never stop.
This sounds like a problem with the hotplug management in Ubuntu. It could also indicate a problem with the power supply via the USB bus (AFAIK the 3490 has no power supply of it's own). In any case it seems it's not related to sane. You could try unloading ehci_hcd and see if that changes anything. This will force the bus to USB 1.1 mode. Another possibility to try is to connect the scanner via an USB hub with a dedicated power supply. Regards, Oliver
