On Mon, Jan 16, 2006 at 08:17:54PM -0500, Chapman Flack wrote:
> Thomas Klausner wrote:
> >I didn't have much luck on my main work station running 3.99.15/i386
> >-- very quickly after I start copying files to it, there is a umass
> >error and the transfer hangs. Usually, umount -f doesn't work and
> >I can't shutdown cleanly.
> >...
> >Ideas?
> 
> kern/26681?

I've committed code from OpenBSD that will fix this on VIA EHCI
controllers. Does that fix your problems? 

FreeBSD used the same workaround for ATI EHCI controllers too...