[Bug 63586] [HSW desktop regression]Resume from s4 causes call trace and system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63586

--- Comment #12 from cancan,feng <cancan.feng at intel.com> ---
Hi, Daniel, I have a new clue that this issue seems to be related to how to
start the machine, i.e. if I reboot the machine with power button(sometimes I
have to do so because of machine hang), then I do S4, the machine will hang
with call trace. But if I reboot the machine by command "reboot" instead of
power button, then do S4, the machine can resume successfully! I did try many
times, every time the same. 
In addition, I tested 3.8 release kernel, and this issue exists there too. I
also tested without loading i915.ko, this issue still happens.
To sum up, so long as the machine is restarted with power button, call trace
and hang! So.. what do you think I should do next?

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