How to log a wake up issue to make a decent bug report?

[deckoff]

I have a problem with my laptop waking up from hibernation - most of the time it will wake up as expected.
Sometimes, the laptop will perform a restart instead of wake up, and will have to be re-started AGAIN, to perform wake-up instead of restart again.
Anyway, to report this bug I (assume) it is much better to append a log file. My question is:
Which is the log file I have to attach? Is it auto created or I have to log it?

[raja.genupula]

actually dmesg gives complete log . may be that gonna help you.