Comment 6 for bug 787210

@Sam: Here's something else to try. Induce the lockup from virtual terminal 1 and then press Alt-Sysrq-9 then Alt-Sysrq-P. If that produces some output, please take a photograph or something to capture the output. After that you can also try pressing Alt-Sysrq-L and Alt-Sysrq-T, then wait a few seconds and press Alt-Sysrq-S and Alt-Sysrq-B. This should produce lots of output then sync your filesystems and reboot your machine. After the reboot completes you can check /var/log/kern.log to see if the data was logged there.