[sane-devel] Problems with Epson 636U

Henning Meier-Geinitz henning@meier-geinitz.de
Tue, 11 Sep 2001 12:00:02 +0200


On Mon, Sep 10, 2001 at 09:58:15PM -0400, Karl Heinz Kremer wrote:
> It looks like the communication between the scanner and the backend fails
> right in the middle of setting up the scan operation. The backend successfully
> sends a receives quite a bit of data before it stops. I suspect that this is
> a problem with the USB sub-system. 

I have a similar problem with the mustek_usb backend and FreeBSD. I
can read and write some registers but then the USB system (or the
scanner) just hangs. If I kill the backend and start it again, it
blocks right at the first read. If I remove the USB cable, the kernel
prints messages about device problems and disables the USB port.