On Wed, 4 Nov 2009, Jesse Barnes wrote: > > It's notable that your log shows there are two EHCI controllers but > > no UHCI or OHCI companion controllers. Is this system based on > > Intel's P55 chipset? There have been numerous reports of hardware > > bugs in the way that chipset handles low-speed or full-speed devices. > > It's a new chipset yeah (an unreleased one), but this behavior also > occurred on an older board with a G45 chipset. Does that older board have companion controllers to go with the EHCI controllers? > And I only noticed it > sometime after 2.6.30; 2.6.28 was fine iirc. > > > If you're sure it's not a hardware issue, and you don't want to go > > through a bisection search just yet, try doing this: Prevent ehci-hcd > > from loaded automatically during bootup. When you then load it > > manually, does the same thing happen? > > Ok, I'll give that a try. If you can reproduce the problem at a time later then initial startup, the next step is to collect a usbmon trace (see Documentation/usb/usbmon.txt). Alan Stern -- 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
