I'm on a Lenovo ThinkPad W510, using Debian Squeeze but with the Kernel and acpi-related packages from testing (this was necessary to make hibernate work in the first place).
When I hibernate my laptop (suspend to disk) and try to wake (resume) it, about half of the time resume fails halfway through and the computer just reboots.
Here's my /var/log/pm-suspend.log after one such failed hibernate/resume cycle: http://dl.dropbox.com/u/5358991/pm-suspend.log
I'm not savvy enough to make much sense of it on my own, maybe somebody can?
/var/log/syslog
after such reboot would be helpful