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Re: [Xen-devel] ehci dbgp reset during boot?

On Mon, Jun 24, 2013 at 9:53 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 24.06.13 at 15:18, Ben Guthro <ben@xxxxxxxxxx> wrote:
>> I'm seeing an issue with the EHCI debug port functionality, that I'm
>> wondering whether it is a known limitation of the hardware, or if this
>> is a bug.
>> On a particular system that I had limited debug capabilities in the
>> past (Dell Inspiron 15 i3) I am seeing the debug messages abruptly
>> stop during boot, followed by garbage that looks like an uninitialized
>> serial port:
>> ...
>> [    3.816669] Freeing SMP alternatives: 20k freed
>> [    3.819784] ACPI: Core revision 20121018
>> x~x~P
>> This always stops with the same ACPI message.
>> I'm wondering if some bus level reset is going on, that might be
>> confusing the debug port, and perhaps it is not recovering from this?
> Possibly - who knows what firmware does... Does the BIOS setup
> have any option to turn off as much of legacy emulation as
> possible (which otherwise may get turned off as ACPI gets enabled)?
> If so, I'd suggest trying this.

Disabling the "USB emulation" setting seemed to do it.
Much appreciated.


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