Re: [Xen-devel] Xen4.2 S3 regression?

[Ben Guthro <ben@xxxxxxxxxx>]

I have verified it is running with uart->irq == 0 when running on serial.

However, when I run with console=none, the observed behavior is very different.
The system seems to go to sleep successfully - but when I press the
power button to wake it up - the power comes on - the fans spin up -
but the system is unresponsive.
No video
No network
keyboard LEDs (Caps,Numlock) do not light up.


Alternate debugging strategies welcome.

/btg

On Fri, Sep 7, 2012 at 7:15 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 07.09.12 at 12:37, Ben Guthro <ben@xxxxxxxxxx> wrote:
>> On Fri, Sep 7, 2012 at 4:38 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>
>>> >>> On 06.09.12 at 18:42, Ben Guthro <ben@xxxxxxxxxx> wrote:
>>> > Odd.
>>> > The behavior seems to change, when not running with serial output.
>>>
>>> Odd indeed. Could you (unless you are already) try running the
>>> serial console in polling mode (i.e. without IRQ), to see whether
>>> the IRQs coming from it somehow keep the system alive at a
>>> certain point?
>>>
>>>
>> I tried to do this at the end of yesterday, since you had suggested it
>> previously, in this thread.
>>
>> I did so by adding a ",0" to my com1 line, per the documentation - However,
>> I am running with a PCI serial card, and not an "on-board" one - so my
>> parameter looks like:
>>
>> com1=115200,8n1,pci,0
>>
>> I am not totally convinced that it is actually running in polling mode, and
>> started to investigate ns16550.c to verify it was. I plan on resuming this
>> investigation this morning.
>> If you have any pointers on what I should be looking for - I'd appreciate
>> any suggestions.
>>
>
> The only thing you need to make sure is that at the end of
> ns16550_parse_port_config() uart->irq is zero. But for PCI
> that should be the default right now in -unstable (but I
> think I have a patch pending to alter this in certain cases).
>
> Jan
>

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