[Bug 66951] [Calpella]Resume from S4 causes system reboot sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66951

cancan,feng <cancan.feng at intel.com> changed:

           What    |Removed                     |Added
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             Status|NEEDINFO                    |NEW

--- Comment #4 from cancan,feng <cancan.feng at intel.com> ---
(In reply to comment #1)
> Wikipedia failed me, so what's a "Calpella" plaform? Also please attach

Calpella and Piketon are both Ironlake platform, Calpella is a mobile platform
and Piketon is a desktop platform. This S4 issue can reproduce on Calpella
easily, about 1 in 3~5 times. I also did S4 syscles on Piketon about 30 times,
but Piketon did it ok. That's why I marked the title "Calpella". ;-)

> dmesg with drm.debug=0xe for this machine (with all the boot messages).

I did try many times to get the boot messages but falied. Generally, we get
messages through three ways: "dmesg", netconsole and serial port. These are my
difficulties here:
1. Because the machine will reboot while this issue happens, so I can't get
messages directly from "dmesg".
2. It's a S4 issue, and netconsole can't work. Because netconsole can't receive
output info after machine resume from S4.
3. This mobile platform has no serial port, so we can't get messages from
serial port..

So I don't know how to get the boot messages while this issue happens,;-( 
Do you have any advice?

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