On Fri, 20 Aug 2010 10:27:53 -0400 (EDT), Alan Stern wrote: > On Thu, 19 Aug 2010, Dennis Nezic wrote: > > > Gah. You're right! The drive works fine (at usb2 speeds / ehci) on > > my other linux laptop (the one that had MSWindows previously)!? > > > > So it works with: > > 00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW > > (ICH6 Family) USB2 EHCI Controller (rev 04) > > > > But not with: > > 00:13.2 USB Controller: ATI Technologies Inc IXP SB400 > > USB2 Host Controller > > > > Why? :S > > How would I know? I already told you my best guess: The hardware is > slightly miscalibrated, and as a result that particular controller > doesn't work well with that particular device. While it might be > caused by a hardware bug in the controller, it's hard to know what > that bug is or how to work around it. > > Do other high-speed devices work okay with the SB400 controller? Yes, i've used a bunch of usb2 devices before without any problems. Any suggestions on how to go about debugging this? Some kind of usb-wire sniffer? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
