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

[Ben Guthro <ben@xxxxxxxxxx>]

I'll work on getting a JTAG, ICE, or something else - it is on an
Intel SDP - so it should have the ports for it.

My current suspicion on this is that the hardware registers are not
being programmed the same way as they were in 4.0.x
(Since the "pulsing power button LED" on the laptops, and the behavior
of the Desktop SDP are now similar)

Once again - I don't have a lot of evidence to back this up - however,
if I ifdef out the register writes that actually start the low level
suspend - in
xen/arch/x86/acpi/power.c  acpi_enter_sleep_state() - the rest of the
suspend process completes as though the machine suspended, and then
immediately resumed.

In this case - the system seems to be functioning properly.





Hack to prevent low level S3 attached.



On Fri, Sep 7, 2012 at 8:18 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 07.09.12 at 13:51, Ben Guthro <ben@xxxxxxxxxx> wrote:
>> 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.
>
> I'm afraid other than being lucky to spot something via code
> inspection, the only alternative is an ITP/ICE. Maybe Intel folks
> could help out debugging this if it's reproducible for them.
>
> Jan
>

Attachment: prevent-s3-lowlevel.patch
Description: Binary data

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