[sane-devel] HP ScanJet 6300C head moving back/forth during scan >200dpi

[Michael Ole Olsen]

Hello again

It's a USB-2.0 machine (the hub is integrated on the motherboard,
ASUS A7N8X deluxe), and I have had no other issues with the usb hub
running fullspeed; I get fine transfer speed to my camera with gphoto2
and to my usb-sticks.

No problems under Windows and also no problems when using the scanner with
scsi or scanner-server (rj45), so the scanner isn't wrecked.

I cannot use the SCSI feature on this computer though - and I don't have
the scanner server here, that's why I want to use it with USB.



/michael ole olsen


On Mon, 14 Apr 2008, m. allan noah wrote:

> On Mon, Apr 14, 2008 at 10:34 AM, Michael Ole Olsen <gnu at gmx.net> wrote:
> > Hello, I am having problem using my HP ScanJet 6300C with libusb and
> >  xsane+sane backend from debian testing. I have also tried debian etch
> >  version on another computer with same issues, and I even tried
> >  downgrading my sane backend (then it went completely insane and almost
> >  broke the scanner). Right now im testing on a cometely fresh install of
> >  Debian/testing.
> >
> >  There are no scanner modules loaded/in kernel and the kernel is PREEMPT 2.6.23.9
> >
> >  When I do a scan, it waits about 6-8 seconds before scanning (just like
> >  it is calibrating), then it moves the scanner head back and forth while
> >  scanning (only when i get over approx. 200dpi)
> >
> >  I did read somewhere on this mailinglist, that it had to do with USB
> >  bandwidth, so the scanner must wait at above 200dpi for the transfer of
> >  data to complete over USB.
> >
> >  I'm using it with a high-speed USB 2.0 hub, so i dont see how there
> >  could be any kind of transfer-bottleneck.
> 
> it's a usb 1.0 machine? does it do this on windows?
> 
> allan
> -- 
> "The truth is an offense, but not a sin"
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