booting with usb keyboard hangs system

Patrick Georgi patrick at
Thu May 12 11:35:09 PDT 2011

Am 12.05.2011 14:20, schrieb Alexander Polakov:
>> atkbdc0.isa0.isab0.pci0.pcib0.acpi0.nexus0.root0
>> atkbdc0: <Keyboard controller (i8042)> [tentative] at port 0x60, 0x64 on isa0
>> atkbd0.atkbdc0.isa0.isab0.pci0.pcib0.acpi0.nexus0.root0
>> atkbd0: <AT Keyboard> [tentative] flags 0x1 irq 1 on atkbdc0
> Doesn't look very usb'ish, does it? I guess it's your BIOS emulating an
> AT keyboard, try checking your CMOS configuration for related settings.
Good catch. The UHCI driver (which should be used when EHCI is disabled
on an Intel board) only seems to set the LEGSUP (== Legacy Support)
register on resume.
This register is responsible for handling 8042 emulation (together with
some SMM code) from USB keyboard events.


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