Re: scanner works on OHCI, but not UHCI

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Tue, 11 Dec 2007, tj wrote:

> I have a Canon FB630U USB scanner I and I am having trouble getting 
> consistant operation with it on a UHCI system vs an OHCI system both 
> running Ubuntu 7.10 2.6 kernel..
> 
> The system that uses the Via chipset exhibits a strange problem. When 
> you plug in the scanner, or boot witht he scanner already plugged in, 
> and you try your first scan, either with scanimage or xsane it just 
> hangs for an indeterminate amount of time. Sometimes it will start the 
> scan after a minute or two and sometmes it will never start the scan. 
> Sometimes you can here the scanner "recalibrate", but thne nothing more 
> happens.  Here is what scanimage -L reveals
> 
> $ scanimage -L
> device `canon630u:/dev/usb/scanner0' is a CANON Canoscan FB630U flatbed 
> scanner
> 
> Now I try the same scanner on a Compag system, OHCI, and it works first 
> time every time. No hesitation. Works perfectly.
> 
> I also have a Slackware 12 installation on the Via UCHI system and it 
> exibits the exact same problem as the Ubuntu installation.
> 
> So, why is it working on one system and not the other?

There could be hardware issues on the VIA system.

Alan Stern


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