On Wed, 20 Feb 2013 valdis.kletni...@vt.edu wrote: > On Wed, 20 Feb 2013 16:07:49 -0800, Greg Kroah-Hartman said: > > > PS-2 connectors can not normally handle hotplugging, the protocol > > doesn't allow it, and for some unlucky devices, it could actually fry > > the motherboard or the PS-2 device. > > > > So that's probably the issue here, the device just doesn't support it, > > sorry. > > You mis-understood the problem. > > This works: > > PS/2 keyboard plugged into this device: > Bus 006 Device 002: ID 0e8f:0020 GreenAsia Inc. USB to PS/2 Adapter > USB side of device plugged into USB port on the Latitude laptop. > Power up, boot - the keyboard works. > > If you plug the USB side of the GreenAsia adapter into a USB slot on > the dock, the keyboard is dead and not recognized by the system. However, > replugging the USB, or unplug/plug the PS/2 side, and it becomes recognized > and starts working. > > This tells me that the dock is doing something busted with USB that the laptop > does correctly, and not enumerating devices until something happens to whack > it > upside the head. I was hoping to identify it and maybe quirk it.
What happens if you prevent ehci-hcd from being loaded during boot and then load it manually afterward? Does the keyboard/adapter/dock combination work then? If it doesn't, try recording a usbmon trace. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
