[sane-devel] Can't download firmware to my scanner

[Oliver Schwartz]

Hi,

> However, when I attempt to access the scanner in any way, using
> xscan, scanimage -T, etc., it does not work, and the scanner then
> disapears from the
> 'scanimage -L' output, and does not return unless hotplug services
> are restarted & the scanner restarted & reattached.
>
> Based on the error output (see below), it seems like there is a
> problem downloading the firmware to the scanner. I haven't been
> able to figure out why. 

You are right, there is something fishy going on in your system during 
firmware upload. For some reason the backend can only send the first 
1024 bytes of the file. 

My best guess is that there is some problem on the USB layer. Can you 
send me logs with SANE_DEBUG_SANEI_USB=255? Do you see any suspicious 
messages in /var/log/messages?

You could also try if unloading the ehci_hcd driver changes anything 
(rmmod ehci_hcd). This will change USB communication to the (slow) 
USB 1.1 mode, in case you have USB 2.0 ports

Regards,

Oliver