On 11/11/13 14:25, Gary Duzan wrote:
As has been mentioned earlier, the xhci driver causes the boot process to hang on some machines, including mine. However, it turns out that a single keystroke on the PS/2 keyboard (the USB one had not been probed yet) allowed the boot to continue, and I successfully accessed a USB2 flash drive connected to one of my USB3 ports. I'm guessing then that there is an interrupt being lost somewhere, or perhaps a missing timeout. The hang was occurring shortly after attaching uhub0, as indicated in the dmesg.boot below, and you can see the umass0 device attaching to it afterwards.
I guess it's not talking to the legacy USB BIOS stuff properly. A quick glance at the code seems to confirm this. Nick