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I believe I reproduced this.  At 04:38am I put computer in sleep.  The
next day I pressed the power button *AND* pressed a bunch of cursor
keys.  As described in the bug the computer would not resume and I had
to power off.  I then booted from my LiveCD, mounted my hard drive, and
looked around.  There were no files in my hard drive's var tree
timestamped later than 04:38am, so it seems the computer did not write
to any log files when it failed to resume.  I've since rebooted
normally.

var/lib/pm-utils/status contained "suspend"

var/lib/pm-utils/resume-hang.log was timestamped several days earlier,
it just contained a list of processes from that earlier time.

var/log/pm-suspend.log was timestamped from the suspend, its last lines
were:

 Save video state failed
 success.
 /etc/pm/sleep.d/action_wpa suspend suspend: success.
 Tue Sep  8 04:38:40 PDT 2009: performing suspend

I have attached the Xorg.0.log from that time, which has the same
contents as my current /var/log/Xorg.0.log.old.  Again, its timestamp is
from the suspend, I have nothing dating from the failed resume.

I hope all this helps, let me know what else I can provide.  I looked at
https://wiki.ubuntu.com/DebuggingKernelSuspendHibernateResume but it
doesn't have much on debugging the "Resume" part.

** Attachment added: "Xorg.0.log from the suspend"
   http://launchpadlibrarian.net/31575994/Xorg.0_broken_resume.log

-- 
sometimes no video on LCD after resume from suspend
https://bugs.launchpad.net/bugs/425968
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