[sane-devel] Accessing scanner through libusb fails with "invalid argument"

[gerard klaver]

On Thu, 2005-03-10 at 23:56 +0100, Sebastian Reichelt wrote:
> Hello!
> 
> I have a Tevion MD9458 scanner which I would like to get to work with
> Linux. Apparently it is supported by SANE, and sane-find-scanner detects
> it correctly. However, when I try to access it with xsane or scanimage,
> I get the message:
> 
> open of device gt68xx:libusb:002:... failed: Invalid argument
> 
> This happens when I am root or a normal user with appropriate
> permissions. The right number increases every time I try this, as
> somehow the file /proc/bus/usb/002/027 disappears and a new file
> /proc/bus/usb/002/028 appears, and so on.
> 
> In syslog, there is also the message:
> usbfs: USBDEVFS_CONTROL failed cmd scanimage rqt 192 rq 1 le n 64 ret
> -84
> And when I do an strace, there are a lot of lines that look like this:
> ioctl(3, USBDEVFS_CONTROL, 0xbfffc790)  = 64
> 
> I'm using a 2.6.10 custom-built kernel and the current SANE and libusb
> drivers from Debian testing (Debian version numbers are 1.0.15-6 for
> libsane and 0.1.10-2 for libusb-0.1-4, whatever that means). USB works,
> and I can also access a digital camera with libusb.
> 
> I hope this is enough information so you can help me with this problem.
> Thanks in advance.
> 
> -- 
> Sebastian Reichelt
> 

To get some debug info type:
export SANE_DEBUG_GT68XX=128
and then type
xsane or xscanimage or scanimage
and check the logs.

See this page for some backend info (maybe done already?)
http://www.meier-geinitz.de/sane/gt68xx-backend/

and check your gt68xx.conf file on the 
override "artec-ultima-2000" option

and check your firmware file?

-- 
--------
m.vr.gr.
Gerard Klaver