Hi, On Sun, Aug 03, 2003 at 06:20:20PM +1200, Frank wrote: > Then I went and replaced my second USB2 connected camera with a USB2 hub. I > noticed almost immediately that Linux-Mandrake did not prefer to have the > "Self" power enabled and worked better without that feature running. I did > not change the (First) USB2 connector and left the scanner connected to it > directly.
Which kernel version do you use? What do you mean by Linux prefers non-self power mode? Error messages? So you have no problems if you unplug the hub? That's most probably a problem in the Linux kernel drivers (or the hardware). I don't know the details about your specific scanner, but here are some general tips for USB trouble: Disable apic and acpi in the kernel. Both seem to cause USB trouble in some configurations. I think there are boo-time options, check google for "noapic". > 1. The scanner light stays on all the time, even after a "Halt" and That's probably because SANE hasn't detected it and so can't turn off the lamp or set a timer to turn it off. What you see now, is the standard behaviour of the scanner if no driver is loaded. > > 2. Xsane [and other programs, eg. OOo1.1rc] can no longer access the > scanner..... > > "Failed to open device 'snapscan:/dev/usb/scanner0'. Invalid argument." Any error messages in syslog (/var/log/messages)? The scanner is listed by scanimage -L correctly? Try SANE_DEBUG_SNAPSCAN=255 scanimage >/tmp/image.pnm 2>log and send us the file "log". It should contain debugging messages. Bye, Henning
